Search Terms for HF Radio propagation

1. 24-hour HF propagation planner
 
A
2. A collection of books, articles, and presentations on HF propagation
3. A combination of long-term prediction and short-term forecast methods
4. A comparison between Radio and Light propagation phenomena
5. A comprehensive beginner's guide for RF propagation
6. A comprehensive guide to HF propagation
7. A guide for ham radio propagation
8. A guide to HF propagation
9. A guide to HF propagation indicators
10. A guide to understanding ham frequencies
11. A primer on space weather
12. A quick guide to solar indices — A review of skywave propagation indicators
13. A review of significat radio blackout events of the 25th solar cycle
14. A simple guide to get started ham radio propaharion
15. A-index
16. Absorption
17. Absorption of skywaves
18. ACE
19. Active sun
20. Activity Charts and DX Clusters—references
21. Activity map ham radio
22. Activity Map of HF Radio QSOs
23. Advanced techniques in HF propagation forecast
24. Advanced tutorials on HF propagation
25. ALE — Automatic link establishment
26. Alerts
27. All-in-One HF Propagation Resource
28. All bands closed?
29. Amateur ham radio
30. Amateur radio
31. Amateur radio and ionospheric science
32. Amateur radio band conditions
33. Amateur radio bands
34. Amateur radio charactaristics
35. Amateur Radio Current Conditions
36. Amateur radio frequencies
37. Amateur radio frequency allocations
38. Amateur radio frequency list
39. Amateur radio grey-line(British) or Gray-line (American)
40. Amateur radio guide on propagation
41. Amateur radio HF band conditions
42. Amateur radio HF propagation conditions
43. Amateur radio HF propagation frequencies & forecast
44. Amateur radio live maps
45. Amateur radio maps
46. Amateur radio online propagation charts
47. Amateur radio online propagation conditions
48. Amateur radio online propagation maps
49. Amateur radio operator
50. Amateur radio propagation conditions
51. Amateur radio propagation forecast
52. Amateur radio propagation frequencies
53. Amateur Radio Propagation Map
54. Amateur Radio Propagation Now
55. Amateur radio propagation studies
56. Amateur radio propagation today
57. Amateur radio publications: books, articles, and presentations on HF propagation
58. Amateur radio solar activity
59. Amateur radio space weather
60. Amateur Radio Usable HF Propagation Frequencies & Forecast
61. Amateur Radio views and reviews for Beginners
62. Amplitude
63. An intro to ham radio for beginners
64. An introduction for beginners on radio propagation
65. An introduction to HF propagation
66. An introduction to radio wave propagation
67. Analyze HF propagation using DX clusters
68. Antenna directivity
69. Antenna efficiency
70. Antenna for NVIS
71. Antenna gain
72. Antenna height
73. Antenna height, directivity, gain
74. Appleton formula for the refractive index the ionosphere
75. Applications for analyzing and forecasting HF propagation
76. Applications used for forecasts and predictions (references — list of sources)
77. APRS-IS—Automatic Packet Reporting System-Internet Service—references
78. Are there any benefits to solar activity?
79. Aurora | At what Kp index can I see aurora?
80. Aurora forecast
81. Aurora light show
82. Auroral Radar Network (references — list of sources)
83. Australian Space Weather Alert System (2024)
 
B
84. Bad conditions on ham bands
85. Band Activity
86. Band Activity Worldwide
87. Band conditions
88. Band conditions banners
89. Band conditions based on DX charts, PSKR, WSPR, WebSDRs, Beacons
90. Band conditions charts
91. Band Conditions Forecast
92. Band Conditions Ham Radio
93. Band conditions ham radio live
94. Band openings
95. Band plan
96. Banners and widgets
97. Banners for band conditions
98. Banners showing propagation conditions
99. Basic amateur radio—HF propagation
100. Basic architecture of radio wave communication
101. Basic electromagnetic wave properties
102. Basic EM wave properties
103. Basic EM wave properties (references — list of sources)
104. Basic intro to ham radio for beginners
105. Basic Wave Propagation, Nor Hadzfizah Binti Mohd Radi (2017)
106. Basics for Short Wave Operation
107. Basic HF propagation for amateur radio
108. Basics of HF propagation
109. Basics of HF radio propagation
110. Basics of Radio Waves
111. Basics of Radio Wave propagation
112. Be prepared for volatile band conditions
113. Be ready to try new frequencies
114. Beacons
115. Beacons—references
116. Beginner's Guide to Ham Radio Range
117. Beginner's guide to HF radio propagation
     1. Intro to HF radio propagation
     2. What is Radio?
118. Benefits of the HAARP Project for Radio Hams
119. Best HF frequencies for daytime
120. Best propagation frequency
121. Best solar propagation frequency
122. Beyond line of site (BLOS)
123. Blackouts what are they?
124. Blind zone
125. BLOS (Beyond line of site)
126. Bt - total strength of the Interplanetary Magnetic field (IMF)
127. Bz - orientation of the IMF
 
C
128. Calculate the ionospheric refractive index
129. Calculation of the maximum usable frequency
130. Can a ham radio reach space?
131. Can ham radio communicate with the other side of the globe?
132. Can ham radio talk around the world?
133. Can HF radio propagation be predicted?
134. Can I get shorwave radio on my PC?
135. Carrington event
136. CF vs MUF—Difference between CF and MUF
137. CF vs MUF: Understanding Critical and Maximum Usable Frequencies
138. Challenges in storm forecasting
139. Characteristics of radio waves
140. ChatGPT learns about forecasting tools for radio amateurs
141. Check DX Propagation with Beacons
142. Chirping
143. Choose now the best HF bands for skywave communication
144. Choose the correct amateur band and the right time of the day for long range communications
145. Choosing the right frequency
146. Choosing the right HF frequency
147. Clouds of plasma in the ionosphere
148. CME - coronal Mass ejection
149. Communication blackout
150. Communication blackout 2024
151. Communication blackout meaning
152. Communication blackout now
153. Communication blackout recent-today
154. Communication circuit
155. Compare DR2W propagation tool with VOACAP
156. Compare forecasting tools for HF radio propagation
157. Compare forecasting tools for radio amateurs
158. Comparing Ionospheric MUF using IRI16 Model with Mid Latitude (2020)
159. Communication conditions
160. Complex HF propagation Modes | Complex Modes of Skywave Propagation—references
161. Concept of wireless communication
162. Conductive ground
163. Core propagation concepts for radio amateurs
164. Core propagation concepts for skywaves
165. Correlation analysis of Solar activity and Cosmic ray (J_Phys_Conf 2017)
166. Correlation of Sunspot Numbers and Geomagnetic Indices
     with Various Climate Change Parameters (2024)
167. Correlation between conditions, MUF, SSN and SFI
168. Correlation between K and A values
169. Correlation between MUF and solar flux
170. Correlation between SFI and bands openings
171. Correlation Between solar flux and sunspot number
172. Correlation between solar indices band conditions
173. Correlation of sunspot numbers and geomagnetic indices
174. Correlation between sunspot numbers and geomagnetic parameters for solar cycle 24
175. Coronal hole
176. Coronal Mass ejection (CME)
177. Critical frequencies foF2, MUF, OTF, LUF
178. Critical Frequencies LUF vs MUF
179. Critical frequency
180. Critical frequency formula
181. Critical Frequency, LUF, and MUF
182. Critical frequency propagation
183. Critique of IONCAP's Reliability and Service Probability Calculations (1993)
184. Current and predicted fadeouts
185. Current band conditions
186. Current flare
187. Current global ham band conditions
188. Current ham band conditions
189. Current ham band conditions explained
190. Current ham band propagation
191. Current ham band propagation conditions
192. Current ham conditions
193. Current ham radio condition charts
194. Current ham radio conditions
195. Current ham radio conditions charts
196. Current ham radio propagation
197. Current ham radio propagation charts
198. Current ham radio propagation conditions
199. Current ham radio propagation map
200. Current ham radio propagation report
201. Current HamBands Conditions
202. Current HF Bands Conditions
203. Current HF Band Conditions Maps For Radio Operators
204. Current HF Band conditions online map
205. Current HF Bands Conditions—Charts for Radio Hams
206. Current HF conditions
207. Current HF propagation
208. Current HF Propagation Conditions
209. Current HF Propagation Conditions FAQ
210. Current HF propagation conditions maps for radio operators
211. Current HF propagation map
212. Current HF radio propagation
213. Current Kp index
214. Current LUF conditions
215. Current LUF map
216. Current LUF propagation
217. Current MUF
218. Current MUF Conditions
219. Current optimal frequency charts
220. Current propagation
221. Current propagation chart
222. Current propagation conditions
223. Current radio communication conditions
224. Current radio propagation conditions
225. Current regional ham band conditions
226. Current shortwave propagation conditions
227. Current Shortwave propagation conditions map
228. Current skywave propagation
229. Current solar activity
230. Current solar alerts
231. Current solar conditions Ham radio
232. Current solar cycle prediction
233. Current solar events
234. Current Solar Flare
235. Current Solar Terrestrial Activity Report
236. Current space weather
237. Current space weather parameters
238. Current sunspot cycle
239. Current sunspot cycle activity
240. Critical frequency
241. Critical frequency map/chart
 
D
242. D layer of ionosphere is rather a region
243. D region
244. D-Rap model—Global Fadeout Report
245. D-Region Absorption Product
246. D Region Absorption Predictions (D-RAP)
247. Daily sunspots groups
248. Day night live world map
249. Day-night—diurnal cycle
250. Dead Zone
251. Definition of the Ionospheric Regions
252. Defining Electromagnetic Waves
253. Decoding space weather data for HF propagation
254. Detect Changes in Propagation Conditions using RBN, WSPR, PSKR—references
255. Detection and Localization of F-layer Ionospheric Irregularities (2022)
256. Diffraction
257. Digisonde Directogram
258. Digital Reporter
259. Direct wave propagation
260. Disadvantages of NVIS
261. Discover ham radio propagation
262. Discover the current solar and atmospheric conditions
263. Dispertion of light
264. Dispersion of radio waves
265. Disrupted HF propagation conditions
266. Distance between NVIS stations?
267. Disturbance-storm time (Dst) index
268. Diurnal cycle
269. DRAP
270. DR2W - DX propagation
271. Dst
272. Ducting
273. DX band condition
274. DX charts
275. DX conditions
276. DX conditions now
277. DX conditions today
278. DX clusters
279. DX ham band conditions
280. DX map | DX propagation map
281. DX Propagation Forecasting
282. DX propagation online map
283. DX propagation prediction
284. DX radio live
285. DX Spots
286. DXFun
287. DXMAPS
288. DXView HF map
289. DXWatch
 
E
290. E layer of ionosphere is rather a region
291. E-region
292. E-sporadic forecast - propquest
293. Earth's Atmosphere Layers
294. Earth's Ionosphere Regions
295. Earth's magnetic field
296. Earth's Magnetosphere
297. Earth Magnetosphere vs Earth's magnetic field
298. Earth observing system (EOS)
299. Earth's magnetic field
300. Easy learning radio propagation
301. Effects of geomagnetic storms on ham radio
302. Effects of geomagnetic storms on radio hams
303. Effects of ionospheric motions and irregularities on HF radio propagation
304. Effects of radio waves
305. Effects of solar activity on amateur radio
306. Electromagnetic Radiation
307. Electromagnetic Radiation—Radio waves properties ► Radio propagation—references
308. Electromagnetic Spectrum ↗
309. Electromagnetic Wave
310. Electromagnetic Waves Basics
311. Electromagnetic Wave Propagation
312. Electron densities
313. Electron flux (Ef)
314. Elevation Angle
315. EM wave Properties
316. EME Deg - earth-Moon-Earth Degradation
317. Equatorial Spread-F Ionospheric dynamics (1962)
318. EsEU - Sporadic E Europe
319. EsNA - Sporadic E North America
320. Estimated sunspot number
321. Etymology of ham radio
322. EUV sunlight
323. Evaluation of models for HF propagation prediction
324. Evolution of forecasting techniques
325. Explain DRAP for radio amateurs
326. Explain ham bands
327. Explain HF propagation charts
328. Explain HF propagation conditions maps and charts
329. Explain HF propagation indicators
330. Explain HF propagation indices
331. Explain how solar data is reelated to HF propagation
332. Explain propagation banners
333. Explain skywave erratic propagation conditions
334. Explain skywave propagation (key factors)
335. Explain skywave propagation charts
336. Explain space weather for radio amateurs
337. Explain space weather indices
338. Explain solar indices
339. Explain what does it mean ham bands closed
340. Explore ham radio communications
341. Explore HF propagation
342. Explore the world of amateur radio
 
F
343. F layer of ionosphere is rather a region
344. Fadeouts
345. Fading
346. Fading due to irregularities of ionospheric regions
347. Factors affecting HF propagation
348. FAQ on HF propagation
349. F10.7—Solar radio flux measures solar radio emission at 10.7 cm (2,800 MHz)
350. F-region
351. Find charts showing the live conditions
352. Find your opening on the map
353. Finding the best operating frequencies for skywave propagation
354. Flares
355. f_oF₂ (F2 critical frequency)
356. foF2 map
357. fof2 real time
358. fof2 today
359. Forecast ham band conditions
360. Forecast HF bands conditions
361. Forecast HF radio propagation - applications
362. Forecast HF propagation conditions
363. Forecast of HF propagation for radio amateurs
364. Forecast of The Ham radio propagation
365. Forecast propagation
366. Forecast propagation for radio amateurs
367. Forecast proton flux
368. Forecast radio skywave conditions
369. Forecast radio skywave propagation
370. Forecast short wave propagation conditions
371. Forecast skywave conditions
372. Forecast skywave propagation
373. Forecast solar flare
374. Forecast vs Prediction
375. Forecast vs prediction of HF band conditions
376. Forecasting and Prediction
377. Forecasting evolution over the last 30 years
378. Forecasting HF propagation for radio amateurs
379. Forecasting ionospheric disturbances
380. Forecasting MUF for a 3000 km path
381. Forecasting tools for radio amateurs
382. Forecasting vs. Prediction
383. Free Electron Density
384. Free gray line map
385. Free HF propagation mapping software
386. Free RF propagation mapping software
387. Free Online HF Propagation Tool for Technical and Non-Technical Users
388. Free RF propagation mapping software
389. Free Resource for Amateur Radio Beginners
390. Frequency allocation
391. Frequency of optimum transmission (FOT)
392. Frequency of optimum traffic (FOT)
393. Fundamentals of electromagnetic wave propagation explained
394. Fundamentals of radio propagation
395. Fundamentals of radio waves propagation
 
G
396. G₀-G₅: scale of geomagnetic activity
397. Gamma rays
398. Gama rays bursts (GRB) a cosmic event
399. Generation of Radio Waves
400. "GeoMag" (index) - earth`s geomagnetic activity
401. Geomagnetic activity
402. Geomagnetic activity forecast
403. Geomagnetic conditions
404. Geomagnetic data
405. Geomagnetic disturbance | Geomagnetic disturbances | Geomagnetic effects
406. Geomagnetic field
407. Geomagnetic field activity
408. Geomagnetic forecast
409. Geomagnetic indices
410. Geomagnetic indices explained Quick guide
411. Geomagnetic indices K, A, HPo
412. Geomagnetic storms
413. Geomagnetic storm and equatorial spread-F (2004)
414. Geomagnetic Storm Dynamics
415. Geomagnetic storm ham radio
416. Geomagnetic Storm Impacts
417. Geomagnetic storms ham radio
418. Geomagnetic storm radio amateur
419. Geomagnetic storms
420. Geophysical activity
421. Getting Started in HF
422. Global conditions | Global conditions banners
423. Global HF conditions
424. Global HF fadeout
425. Global HF propagation
426. Global radio propagation conditions
427. Global vs Regional HF propagation conditions
428. GMF
429. Gray-line or grey-line
430. Gray line live map
431. Gray line propagation
432. GRB - Gama-rays bursts
433. Grey Line Map
434. Grey line map real time
435. Greyline short explanation
436. Greyline propagation
437. Greyline radio propagation explained
438. Greyline vs "Solar Terminator"
439. Ground wave and sky propagation
440. Ground wave propagation ↗
441. Ground wave vs skywave
442. Ground waves
443. Guide for radio hams on HF propagation
444. Guide to radio wave propagation, studies, guides and documentation
 
H
445. Hale cycle
446. Ham activity
447. Ham band activity
448. Ham band condition charts
449. Ham band condition now
450. Ham band conditions
451. Ham band list
452. Ham band propagation chart
453. Ham band propagation characteristics
454. Ham band propagation conditions
455. Ham band propagation map
456. Ham band report
457. Ham band status
458. Ham bands closed
459. Ham bands conditions
460. Ham bands map | Ham band map
461. Ham bands open
462. Ham bands' activity
463. Ham condition chart
464. Ham conditions
465. Ham DX map
466. Ham propagation
467. Ham propagation dashboard
468. Ham propagation map
469. Ham Radio - Shortwave Band List
470. Ham radio atmospheric conditions
471. Ham radio band characteristics
472. Ham radio band conditions
473. Ham radio band frequencies
474. Ham radio band conditions app
475. Ham radio band conditions map
476. Ham radio band conditions today
477. Ham radio band frequencies
478. Ham radio band plan
479. Ham radio band plan (list of references)
480. Ham radio band propagation
481. Ham radio band propagation characteristics
482. Ham radio band propagation chart
483. Ham radio bands
484. Ham radio bands and frequencies | Ham radio bands & frequencies
485. Ham Radio Bands: Frequencies and Characteristics
486. Ham radio basics: Beginners guide to HF radio propagation
487. Ham radio charts
488. Ham radio communications
489. Ham radio condition
490. Ham radio condition charts
491. Ham radio condition map
492. Ham radio condition maps
493. Ham radio conditions
494. Ham radio conditions map
495. Ham radio conditions today
496. Ham radio current conditions
497. Ham radio dead bands
498. Ham radio DX live streaming
499. Ham radio DX map
500. Ham radio for Beginners
501. Ham radio for Newbees
502. Ham radio for Newbeis
503. Ham radio frequencies
504. Ham radio frequencies and bands | Ham radio frequencies & bands
505. Ham radio frequencies chart
506. Ham radio frequencies conditions
507. Ham radio frequencies explained
508. Ham radio frequencies list
509. Ham radio frequencies propagation charts
510. Ham radio frequencies to listen to
511. Ham radio frequencies & bands in the USA
512. Ham radio frequency allocation
513. Ham radio frequency chart
514. Ham radio frequency guide
515. Ham radio frequency range chart
516. Ham Radio Glossary of Terms
517. Ham Radio Guide for HF propagation
518. Ham radio HF band conditions
519. Ham radio HF conditions
520. Ham radio HF propagation real-time
521. Ham radio high frequency band
522. Ham radio live
523. Ham radio MUF
524. Ham radio operating frequency chart
525. Ham radio propagation
526. Ham radio propagation app
527. Ham radio propagation charts
528. Ham radio propagation conditions
529. Ham radio propagation current conditions
530. Ham radio propagation forecast
531. Ham radio propagation forecasts
532. Ham radio propagation frequencies
533. Ham radio propagation indices
534. Ham radio propagation introduction
535. Ham radio propagation live map
536. Ham radio propagation map
537. Ham radio propagation overview
538. Ham radio propagation now
539. Ham radio propagation prediction
540. Ham radio propagation real-time
541. Ham radio propagation review
542. Ham radio propagation today
543. Ham radio propagation tutorial
544. Ham radio propagation websites
545. Ham Radio Propagation YouTube
546. Ham radio propagation: Solar conditions
547. Ham radio QSO planner
548. Ham Radio Range Guide
549. Ham Radio Range Guide: How Far Can You Talk?
550. Ham Radio Range: How Far Can You Talk With It?
551. Ham radio secrets
552. Ham radio skywave tutorial
553. Ham radio solar activity
554. Ham radio solar conditions
555. Ham radio solar cycle
556. Ham radio solar weather
557. Ham radio space weather
558. Ham radio websites
559. Ham radio websites about forcasing HF propagation
560. Ham radio sun conditions
561. Ham radio sunspot
562. Ham radio sunspot conditions
563. Ham radio sunspots now
564. Ham radio Today
565. Ham radio wave propagation
566. Ham Radio YouTube Channels Skywave Propagation
567. Ham Solar
568. Ham solar conditions
569. HamSCI Space Weather Operational Resources and
     Needs of the Amateur Radio Community (2020)
570. Heliophysics
571. Heliophysics and Amateur Radio
572. Heliosphere
573. Heliospheric Current Sheet (HCS)
574. Helioviewer
575. Helium lines
576. HF—High frequency
577. HF band conditions
578. HF band conditions maps
579. HF band conditions regional
580. HF Band conditions: A Comprehensive Guide
581. HF band openings
582. HF band propagation FAQ
583. HF bands - what to expect
584. HF bands affected by solar conditions
585. HF bands allocated for radio amateurs
586. HF bands allocated for radio amateurs and their characteristics
587. HF bands allocated for radio amateurs and their features
588. HF bands ham radio guide
589. HF bands assigned to hams
590. HF bands assigned to radio amateurs
591. HF Bands Ham Radio Guide
592. HF bands open now
593. HF band propagation chart
594. HF bands monitoring
595. HF communication
596. HF communication prediction tools
597. HF communications response to solar activity
598. HF conditions
599. HF conditions at a glance
600. HF Conditions in Real Time
601. HF conditions UK
602. HF critical frequency
603. HF DXView
604. HF frequency range
605. HF guide for all level radio ham
606. HF ham radio bands
607. HF ham radio bands: HF frequencies
608. HF ham radio DX
609. HF ham radio for beginners
610. HF open now
611. HF openings now
612. HF prediction
613. HF Propagation
614. HF Propagation alerts
615. HF Propagation and the Ionosphere
616. HF propagation and solar-terrestrial data
617. HF propagation app
618. HF propagation applications
619. HF propagation bad conditions
620. HF propagation basics
621. HF propagation blackout
622. HF propagation calculator
623. HF propagation chart
624. HF propagation charts
625. HF Propagation Condition Map
626. HF propagation conditions
627. HF propagation conditions explained
628. HF propagation conditions: forecasting and prediction
629. HF propagation conditions at a glance
630. HF propagation data
631. HF propagation data app
632. HF propagation data seasons
633. HF propagation data study
634. HF propagation disruptions on a global scale
635. HF propagation disruptions AU
636. HF propagation disruptions UK
637. HF propagation disruptions US
638. HF propagation Europe
639. HF propagation experts
640. HF propagation explained
641. HF propagation explanation
642. HF propagation fadeouts
643. HF propagation fluctuations
644. HF propagation for advanced hams
645. HF Propagation for amateurs
646. HF propagation for beginners
647. HF propagation for beginners and advanced
648. HF propagation for ham operators
649. HF Propagation for ham radio explained
650. HF propagation for hams explained
651. HF propagation for newbees
652. HF Propagation for amateurs
653. HF Propagational Resources
654. HF propagation for radio amateurs
655. HF propagation for radio hams
656. HF propagation forecast
657. HF propagation forecast applications
658. HF propagation forecast for radio amateurs
659. HF propagation forecast tool KC2G
660. HF propagation forecast tools (references)
661. HF propagation forecasting
662. HF propagation forcasts
663. HF propagation fundamentals
664. HF propagation guide
665. HF propagation guide for radio hams
666. HF propagation indicators
667. HF propagation ionospheric disturbances
668. HF propagation live chart
669. HF propagation live map
670. HF propagation map
671. HF propagation mapping software
672. HF propagation models
673. HF propagation modes
674. HF propagation modes overview
675. HF propagation mysteries
676. HF propagation now (real-time)
677. HF propagation odd conditions
678. HF propagation online map
679. HF propagation online reports
680. HF propagation overview
681. HF propagation planner
682. HF propagation planning
683. HF propagation planning tool
684. HF propagation prediction
685. HF propagation prediction online
686. HF propagation prediction software
687. HF propagation prediction tools
688. HF propagation predictions
689. HF propagation preface
690. HF propagation reporter
691. HF propagation reports
692. HF propagation scale
693. HF propagation seasonal anomaly
694. HF propagation shortcast overview
695. HF propagation shortcast review
696. HF propagation score
697. HF propagation shortcasts a folder of brief podcasts less than 15 minutes
698. HF Propagation software review
699. HF Propagation solar indicators
700. HF propagation status
701. HF Propagation status and alerts
702. HF propagation tools
703. HF propagation tutorials
704. HF propagation tutorial for radio amateurs
705. HF propagation tutorials
706. HF propagation today
707. HF propagation tools
708. HF propagation using solar index
709. HF propagation what is it?
710. HF propagation widget
711. HF Propagation YouTube
712. HF radio bands and propagation
713. HF radio glossary
714. HF radio communication
715. HF radio communication circuit
716. HF radio conditions
717. HF radio propagation
718. HF radio propagation app
719. HF radio propagation bands
720. HF radio propagation basics
721. HF radio propagation chart ↗ ↗
722. HF radio propagation conditions
723. HF radio propagation during a solar storm
724. HF radio propagation for beginners
725. HF radio propagation forecast
726. HF radio propagation indices and scales
727. HF propagation map Nowcast
728. HF radio propagation map: Explanation of real-time MUF 3,000 km propagation map
729. HF radio propagation maps
730. HF radio propagation modes
731. HF radio propagation now
732. HF radio propagation prediction | HF radio propagation prediction compared to forecast
733. HF radio propagation seasons
734. HF radio propagation tutorials for radio amateurs
735. HF radio propagation software
736. HF radio propagation today
737. HF skywave communication circuit
738. HF radio wave propagation
739. HF radio wave propagation factors
740. HF radio waves (basics)
741. HF real-time propagation
742. HF regional conditions
743. HF signals propagation
744. HF skywave communication
745. HF skywave window: LUF—MUF
746. HF space weather
747. HF Systems MUF maps and forecasting charts
748. HF wave propagation
749. HFTA - High frequency Terrain Assessment
750. High frequency communication circuit
751. High frequency communications response to solar activity
752. High frequency (HF) amateur radio
753. High frequency propagation software
754. High frequency radio propagation
755. Highest frequency bands at night
756. Highest Possible Frequency (HPF)
757. History of amateur radio
758. How are current band conditions?
759. How are HF conditions determined?
760. How are ionospheric conditions measured?
761. How can I monitor HF bands without having a good receiver and antenna?
762. How can I operate during solar storms?
763. How can I use my PC as a ham band monitor?
764. How can propagation reports help ham radio operators
765. How can we forecast changes in HF conditions over the next hour?
766. How can we forecast HF propagation conditions?
767. How do disturbances such as solar flares, geomagnetic storms, and traveling ionospheric disturbances affect radio wave propagation?
768. How do geomagnetic storms affect radio wave propagation?
769. How do I find open ham bands
770. How do I find out what bands are open?
771. How do radio frequencies work?
772. How do ionospheric disturbances affect radio wave propagation?
773. How do radio waves bounce off the ionosphere for long-distance communication?
774. How do radio waves propagate?
775. How do radio frequencies work?
776. How do radio waves carry data?
777. How do radio waves travel through the Earth's atmosphere?
778. How do radios work?
779. How do solar flares affect radio wave propagation?
780. How do solar flares cause geomagnetic storms?
781. How do solar storms affect radio propagation?
782. How do solar storms cause geomagnetic storms?
783. How do the seasons affect HF radio propagation?
784. How do traveling ionospheric disturbances affect radio wave propagation?
785. How do you interpret HF propagation map?
786. How do you read HF band conditions?
787. How do we communicate using radio waves?
788. How do we monitor space weather?
789. How does a fadeout happen?
790. How does geomagnetic activity affect HF propagation?
791. How does elevation affect HF propagation?
792. How does ham radio work?
793. How does HF propagation work?
794. How does HF radio propagate?
795. How does ionospheric propagation take place?
796. How does ionospheric propagation work?
797. How does radio waves compare to visible light?
798. How does space weather affect ham radio?
799. How does the ionosphere affect HF radio propagation?
800. How does the ionosphere affect radio wave propagation?
801. How does the ionosphere couple with the neutral atmosphere and with space?
802. How does the ionosphere respond to inputs from space and from the neutral atmosphere?
803. How does the sun affect radio communication?
804. How far can a ham radio reach?
805. How far can ham radio talk?
806. How far can HF radio go?
807. How far can HF radio transmit?
808. How far can HF transmit?
809. How far can I communicate by radio?
810. How far can I talk with my ham radio?
811. How far can you talk on ham radio?
812. How far will a radio transmit?
813. How ionospheric structure affects radio refraction
814. How radio waves carry data?
815. How radio waves propagate
816. How radio waves travel
817. How skywave propagation works?
818. How solar storms affect ham radio propagation
819. How the Sun powers the ionosphere
820. How to assess propagation?
821. How to choose antenna?
822. How to choose ham band based on propagation conditions?
823. How to determine HF propagation conditions?
824. How to determine if a band is open?
825. How to find out propagation conditions now
826. How to improve HF communication frequency selection ability?
827. How to know if a band is open?
828. How to plan your QSO with VOACAP?
829. How to predict MUF?
830. How to read HF band conditions?
831. How to Read Propagation Charts for HF DXing
832. How to Read Propagation Indices for HF DXing
833. How to select a frequency for NVIS operation?
834. How to use a remote HF radio receiver?
835. How to use NVIS?
836. How to use propagation forecast charts?
837. How to use propagation tools effectively
838. How will a solar storm affect my ham radio activities?
839. HPF—Highest Possible Frequency
840. Hybrid ionospheric models
 
I
841. IMF - Interplanetary Magnetic field
842. Impacts of space weather
843. Impacts of space weather on HF radio communications
844. Impact of the sun
845. Index of refraction—Glass's refractive index in comparison to plasma/ionosphere
846. Incident angle
847. Information about amateur radio frequencies
848. Interplanetary magnetic field (IMF)
849. Interpretation of the propagation indices
850. Introduction to HF propagation
     Recommended references:
     1. Introduction to HF Radio Propagation Australian Gov (2002)
     2. Introduction to-HF Radio Propagation Australian Gov (2007)
     3. Ionospheric Propagation, Prof. Sean Victor Hum (2018)
851. Ionospheric propagation
852. Ionospheric propagation frequency range
853. Ionospheric Radio Propagation, Kenneth Davies (1965)
854. Ionospheric regional conditions
855. Introduction to Ionospheric Propagation
856. Introduction to Radio Communications Principles
857. Introduction to RF propagation
858. Ionisation
859. Ionization
860. IonoProbe
861. Ionogram
862. Ionograms (references — list of sources)
863. Ionosonde
864. Ionosondes (references — list of sources)
865. Ionosondes HF propagation
866. ionosphere
867. Ionosphere — HF radio propagation;
     Multi-refractions; free electron density and Geomagnetic storms
868. Ionosphere and HF
869. Ionosphere and radio signals
870. Ionosphere and skywave propagation;
     Ionization of D, E and F regions | Free-electron density | Skywaves
871. Ionosphere at night
872. Ionosphere conditions
873. Ionosphere dynamics
874. Ionosphere is a part of which layer of atmosphere?
875. Ionosphere is also known as...
876. Ionosphere layers diagram
877. Ionosphere probing
878. Ionosphere propagation
879. Ionosphere regions
880. Ionosphere temperature
881. Ionosphere understanding
882. Ionosphere, radio waves
883. Ionosphere, space weather and radio propagation
884. Ionosphere’s influence
885. Ionospheric absorption
886. Ionospheric anomalies (references — list of sources)
887. Ionospheric bubbles
888. Ionospheric clouds
889. Ionospheric conditions explained
890. Ionospheric conditions overview
891. Ionospheric data
892. Ionospheric dispertion of radio waves
893. Ionospheric distortion
894. Ionospheric disturbances
895. Ionospheric disturbances and HF propagation conditiona
896. Ionospheric disturbances and their impacts on HF radio wave propagation
897. Ionospheric disturbances probing (references — list of sources)
898. Ionospheric dynamics
899. Ionospheric effects on hf radio wave propagation
900. Ionospheric interference
901. Ionospheric irregularities
902. Basic Ionospheric models (references — list of sources)
• Ionospheric models
• Ionospheric models that simulate a neural network
• Ray-tracing models
• Skywave propagation indicators
• Hybrid ionospheric models
903. Ionospheric monitoring and HF frequency management
904. Ionospheric prediction and HF frequency management
905. Ionosphere propagation
906. Ionospheric propagation chart
907. Ionospheric propagation map
908. Ionospheric propagation examples
909. Ionospheric propagation model
910. Ionospheric propagation of radio waves explained
911. Ionospheric propagation theory
912. Ionospheric radio propagation
913. Ionospheric reflection (resources)
914. Ionospheric regions
915. Ionospheric regions (references — list of sources)
916. Ionospheric regions and HF Skywaves
917. Ionospheric research (references — list of sources)
918. Ionospheric skywave propagation
919. Ionospheric storms
920. Ionospheric variations (references — list of sources)
921. Is HF propagation reciprocal?
922. IRI ionospheric model
923. ITU model
 
J
924. John Ashworth Aatcliffe (12-December-1902-25-October 1987)
 
K
925. KC2G HF MUF propagation maps
926. Keep an Eye on the High Bands
927. Key aspects of radio propagation for hams
928. Key concepts of electromagnetic wave propagation
929. Key concepts of HF propagation
930. Key factors affecting HF propagation
931. Key for HF Propagation Charts
932. Key Propagation Modes
933. K-Index
934. K-index Australia
935. K-index United Kingdom
936. K-index United States
937. Kp index
938. Kp index Aurora
939. Kp Index Explained
940. Kp index Nowcast
941. KiwiSDR map of remote public SDR receivers accessible via the Internet
 
L
942. Lagrange points
943. Latest DX Propagation
944. Latest HF Bands Propagation
945. Latest HF Bands Propagation, DX
946. Layers or regions of the ionosphere?
947. Learn basic radio propagation
948. Learn High-Frequency Propagation
949. Learn how to interpret propagation charts for improved HF band communication
950. Learn skywave propagation
951. Learning about space weather
952. Line of sight propagation (LOS)
953. Live DX spot reports by ham radio
954. Live ham band reports
955. Live ham radio band conditions
956. Live ham radio map
957. Live ham radio propagation
958. Live ham radio reports
959. Live HF DX propagation maps
960. Live HF propagation
961. Live HF propagation charts and maps
962. Live HF propagation map
963. Live HF propagation maps and charts
964. Live HF propagation maps and charts explained
965. Live Propagation and Solar Data
966. Live radio propagation map
967. Live radio propagation reports
968. Live solar activity
969. Live solar alerts for ham radio
970. Live solar events and past solar activity
971. List of ham radio frequencies
972. Listen to live ham bands via internet
973. LOS—Line of sight propagation
974. Long and mid-range skywaves
975. Long distance communication
976. Long-and short-term prediction of HF radio propagation
977. Long-term HF propagation planning
978. Long-term prediction and short-term prediction of HF radio propagation
979. Lowest & Maximum Usable Frequency, Critical Frequency
980. Lowest usable frequecy (LUF)
981. Lowest Usable Frequency map
982. LUF frequency range due to SID
983. LUF frequency range chart
984. LUF (Lowest Usable frequency)
985. LUF chart
986. LUF chart for radio amateurs
987. LUF map
988. LUF Propagation Map
989. LUF-MUF window:
 
M
990. Magic band openings
991. Magnetic field
992. Magnetosphere (MS)
993. Making sense of solar indices
994. Mastering HF propagation
995. Maximum usable frequency (MUF)
996. Maximum Usable frequency map
997. Methods for evaluating the current band conditions
998. Methods for forecasting band conditions
999. Methods for monitoring HF propagation
1000. Methodes to forecast radio propagation
1001. Minimum usable frequecy—The lowest usable frequency (LUF)
1002. Models
1003. Model evaluation
1004. Model validation
1005. Model verification
1006. Modeling the Topside Ionosphere Observations by Satellites (2003)
1007. Models of Radio Wave Propagation in Wireless Communication
1008. Modes of HF radio propagation
1009. Modes of radio propagation
1010. Modes of Radio Wave Propagation in Wireless Communication
1011. Monitor band activity of radio amateurs ↗
1012. Monitor Worldwide HF HAM Band Activity
1013. Monitoring and forecasting skywave propagation
1014. Monitoring HF band activity
1015. Monitoring HF band conditions
1016. Moniotring HF propagation
1017. Monitoring solar flux levels for promising band openings
1018. MS — Meteor Scatter Activity
1019. MUF | Maximum Usable Frequency
1020. MUF(3000)F2 plots
1021. MUF 3000 km map
1022. MUF and LUF
1023. MUF calculation
1024. MUF calculator
1025. MUF factor
1026. MUF ham radio
1027. MUF Indicator
1028. MUF indicators
1029. MUF LUF FOT
1030. MUF LUF prediction
1031. MUF map
1032. MUF map real time
1033. MUF maps and charts
1034. MUF meaning
1035. MUF propagation
1036. MUF propagation chart
1037. MUF propagation map
1038. MUF propagation map: Assess optimal frequencies and paths
1039. MUF propagation online map
1040. MUF radio propagation
1041. MUF radio propagation map
1042. MUF, LUF, and FOT
1043. Multipath Propagation
1044. My current local HF conditions
1045. Mystery in wave propagation conditions
 
N
1046. Near real-time HF propagation charts
1047. Near real-time F2-region critical frequency map
1048. Near real-time regional maps
1049. Near real-time skywave propagation charts
1050. Near Vertical Incidence Skywave
1051. NET ionospheric model
1052. NM7M HF Propagation tutorial by Bob Brown, NM7M
1053. NOAA
1054. NOAA predicted sunspot number
1055. NOAA Radio dashboard
1056. NOAA solar cycle
1057. NOAA solar flux predictions
1058. NOAA sunspot cycle predictions
1059. NOAA SWPC space weather scales
1060. Noise level
1061. Notable solar storms during the 25th solar cycle
1062. Nowcast HF propagation conditions
1063. Number of radio amateurs by country
1064. NVIS
1065. NVIS antenna
1066. NVIS antennas explained
1067. NVIS Antennas Theory & Practice
1068. NVIS HF signal propagation in ionosphere
1069. NVIS map
1070. NVIS propagation
1071. NVIS propagation concept
1072. NVIS propagation maps—Amateur and commercial operators
1073. NVIS propagation problems
1074. NVIS tutorial
1075. NVIS vs conventional skywave
1076. NVIS: Stephen C. Finch AI0W (2008)
 
O
1077. Observations - Geo (Terrestrial) & Solar
1078. Observations and Modeling of Traveling Ionospheric Disturbances
1079. Odd propagation conditions
1080. Official ham band plans, tables and charts
1081. On-Line HF Propagation Forecast
1082. On-line HF Propagation Prediction
1083. Online chart of the recent LUF
1084. Online HF propagation prediction
1085. Online indices
1086. Online LUF chart
1087. Online LUF map
1088. Online propagation charts
1089. Online propagation tools
1090. Online HF propagation prediction
1091. Online propagation tools
1092. Online radio planning
1093. Online radio planning software
1094. Online real-time propagation charts
1095. Open ham bands
1096. Optical dispertion of light vs Ionospheric dispertion of radio waves
1097. Optimal sending frequency
1098. Optimizing HF Bands: Frequency, Propagation, and Time-of-Day
1099. Optimum traffic frequency (OTF)
1100. Optimum transmission frequency (OTF)
1101. Optimizing HF Bands—Frequency, Propagation, and Time-of-Day
1102. Overview Of Electromagnetic Wave Propagation
1103. OWF — Optimum Working frequency
 
P
1104. Past solar activity
1105. PCA (polar cap absorption)
1106. Phase
1107. Physics of Propagation - Refraction Absorption Polarization
1108. Plan ahead an HF QSO
1109. Plan HF QSO for the next day
1110. Plan HF QSO for the next week
1111. Plan HF QSO for the next month
1112. Plan HF communication on ham bands
Plan QSO for the next month Plan QSO for the next week
1113. Plan your QSO today
1114. Plan your QSO with VOACAP
1115. Plan Your QSOs
1116. Plan your HF radio operations now, the next 24 hours and more
1117. Planning a QSO with VOACAP
1118. Plasma
1119. Plasma clouds
1120. Point-to-Point 24-hour HF propagation forecast
1121. Point-to-Point 24-hour HF propagation planner
1122. Polar cap absorption event (PCA)
1123. Polarization
1124. Popular Propagation Tools for Amateur Radio
1125. Position in the Electromagnetic Spectrum
1126. PSKR, WSPR
1127. Practical applications
1128. Practical approach
1129. Practical Forecasting and Prediction
1130. Practical guide
1131. Predict conditions
1132. Predict HF propagation radio propagation
1133. Predict MUF
1134. Predict propagation
1135. Predict skywave propagation—nowcast
1136. Predict solar flux
1137. Predict space weather
1138. Predict sunspot numbers
1139. Prediction of sky-wave propagation conditions
1140. Predicting HF Band Conditions for Ham Radio
1141. Predicting HF propagation
1142. Predicting ionospheric conditions
1143. Predicting propagation
1144. Predicting propagation of skywave
1145. Predicting radio propagation
1146. Predicting skywave propagation
1147. Predicting solar flares
1148. Predicting solar flux
1149. Prediction
1150. Prediction vs forecast of HF band conditions
1151. Principles of radio wave propagation
1152. Probing ionospheric disturbances (references — list of sources)
1153. Propagation
1154. Propogation and RadioScience, KL7AL (ARRL 2005)
1155. Propagation and Sun
1156. Propagation beginner's guide
1157. Propagation characteristics of radio waves
1158. Propagation characteristics analysis of high-frequency radio waves
1159. Propagation charts tutorial
1160. Propagation conditions
1161. Propagation conditions for DX
1162. Propagation forecast
1163. Propagation HF prediction
1164. Propagation indicators
1165. Propagation indicators: foF2, MUF, OWF, LUF
1166. Propagation indices
1167. Propagation — modes of HF radio propagation
1168. Propagation charts for ham radio↗ ↗
1169. Propagation condition map
1170. Propagation conditions
1171. Propagation DX
1172. Propagation explained
1173. Propagation factors & conditions
1174. Propagation forecast
1175. Propagation forecast for HF radio
1176. Propagation forecast methodes
1177. Propagation forecast software ham radio
1178. Propagation forecasts for radio amateurs
1179. Propagation guide for radio hams
1180. Propagation indices (plural of propagation index)
1181. Propagation live map
1182. Propagation map
1183. Propagation map for ham radio
1184. Propagation maps for ham radio
1185. Propagation Models
1186. Propagation modes
1187. Propagation Modes—Presentation, Ken Larson, KJ6RZ (2024)
1188. Propagation of electromagnetic waves
1189. Propagation of HF radio waves
1190. Propagation of radiowaves
1191. Propagation of radio waves
1192. Propagation of radio waves explained
1193. Propagation of radio waves: ground wave vs. skywave
1194. Propagation of RF Signals
1195. Propagation of high frequency radio waves — The rebirth of HF
1196. Propagation of radio waves for beginners
1197. Propagation of RF Signals
1198. Propagation of shortwave radio
1199. Propagation of short radio waves
1200. Propagation online map
1201. Propagation Overview 48-Hour
1202. Propagation prediction
1203. Propagation predictions for HF operation
1204. Propagation prediction programs and forecasts
1205. Propagation prediction software for skywave propagation
1206. Propagation prediction software ham radio
1207. Propagation Prediction Tool
1208. Propagation prediction tools
1209. Propagation Prediction Tools
1210. Propagation radio stations map
1211. Propagation report ham radio
1212. Propagation reports
1213. Propagation reports for digital modes
1214. Propagation software
1215. Forecasting communication conditions over the next 24 hours
1216. Forecasting tools
1217. Propagation tools for ham radio
1218. Propagation tools to help succeed with your ham radio
1219. Propagation Tutorial | Table of contents
1220. Propagation visualization
1221. Properties of electromagnetic waves
1222. Properties of radio waves
1223. Proton flux (Pf)
1224. PSKR - PSK reporter
 
Q
1225. QSL net propagation
1226. QSO Activity reports
1227. Quick guide to HF propagation using solar indices
1228. Quiet sun
 
R
1229. R-S-G Scales defined
1230. R-S-G Scales now
1231. R1-R5: Scale of Radio blackouts
1232. Radio Amateur
1233. Radio amateur HF tutorial
1234. Radio blackout phenomenon
1235. Radio blackout
1236. Radio blackout effects
1237. Radio blackout map
1238. Radio blackout phenomenon
1239. Radio blackout today
1240. Radio blackouts
1241. Radio amateurs HF bands charactaristics
1242. Radio blackouts due to solar storms
1243. Radio blackout events during 2024
1244. Radio books on HF propagation
1245. Radio communication and the ionosphere
1246. Radio Communication Circuit
1247. Radio communications dashboard
1248. Radio coverage simulation software long-term
1249. Radio coverage simulation software short and long terms
1250. Radio fadeouts
1251. Radio frequency
1252. Radio frequency allocations
1253. Radio Frequency (RF) Fundamentals
1254. Radio frequency chart
1255. Radio frequency communication circuit
1256. Radio frequency propagation
1257. Radio frequency telecommunication circuit
1258. Radio frequency range chart
1259. Radio frequency ranges chart
1260. Radio frequency table
1261. Radio frequency use chart
1262. Radio frequency and Ionosphere
1263. Radio frequency propagation
1264. Radio frequency propagation
1265. Radio frequency propagation: A comprehensive beginner’s guide
1266. Radio frequency propagation for ham radio
1267. Radio frequency propagation: A Comprehensive Guide
1268. Radio ham bands live
1269. Radio ham HF band conditions
1270. Radio propagation | Radio Propagation—references
1271. Radio propagation - what is it?
1272. Radio propagation and space weather
1273. Radio propagation basics
1274. Radio propagation beacon
1275. Radio propagation charts
1276. Radio propagation conditions map
1277. Radio propagation conditions today
1278. Radio propagation data map
1279. Radio propagation explained
1280. Radio propagation for beginners
1281. Radio propagation for hams explained
1282. Radio Propagation Forecast
1283. Radio propagation forecasting
1284. Radio propagation formula
1285. Radio propagation free planning tools
1286. Radio propagation free software
1287. Radio propagation frequency
1288. Radio propagation indicators
1289. Radio propagation indices
1290. Radio propagation levels map
1291. Radio propagation live map
1292. Radio propagation map
1293. Radio propagation mapping software current status
1294. Radio propagation mapping software forecast
1295. Radio propagation maps
1296. Radio propagation methods
1297. Radio propagation metrics
1298. Radio propagation model
1299. Radio propagation modeling
1300. Radio propagation planning
1301. Radio propagation planning tools (forecast)
1302. Radio propagation planning tools (preduction)
1303. Radio propagation principles
1304. Radio propagation prediction
1305. Radio propagation prediction for HF communications
1306. Radio propagation prediction vs. foracasting
1307. Radio propagation prediction modelling
1308. Radio Propagation Online Tools
1309. Radio Propagation Overview
1310. Radio Propagation Overview Recent 48-Hours
1311. Radio propagation properties
1312. Radio propagation report
1313. Radio propagation seasonal anomaly
1314. Radio propagation simulator (forecast)
1315. Radio propagation simulator (preduction)
1316. Radio propagation software
1317. Radio propagation today
1318. Radio propagation tool
1319. Radio propagation tutorials
1320. Radio propagation YouTube
1321. Radio spectrum | Radio Spectrum—references
1322. Radio spectrum allocation
1323. Radio spectrum management and allocations
1324. Radio wave
1325. Radio wave fundamentals
1326. Radio wave interaction with the environment
1327. Radio wave principles
1328. Radio wave propagation
1329. Radio wave propagation
1330. Radio wave propagation fundamentals
1331. Radio wave propagation guide
1332. Radio wave propagation in the ionosphere
1333. Radio wave propagation model
1334. Radio Wave Propagation part-1 Introduction, Marcel H. De-Canck, ON5AU (2002)
1335. Radio wave propagation tutorial
1336. Radio wave HF propagation models
1337. Radio wave characteristics
1338. Radio wave propagation charactaristic
1339. Radio wave propagation forecasting
1340. Radio wave propagation in the ionosphere
1341. Radio wave propagation today
1342. Radio wave transmission
1343. Radio waves
1344. Radio waves and communcations distance
1345. Radio waves and the ionosphere—effetcs
1346. Radio waves and the ionosphere-regions
1347. Radio Waves and the Ionosphere, G3YWX (QST 1999)
1348. Radio waves examples
1349. Radio waves nature and properties
1350. Radio waves overview
1351. Radio waves properties
1352. Radio wave spectrum
1353. Radio-wave propagation
1354. Radio-wave propagation modes
1355. Radiowave Propagation
1356. Ray tracing models
1357. Ray tracing Optics
1358. RBN - Reverse beacon Network
1359. Real time HF band activity
1360. Real time HF band conditions
1361. Real time propagation and band conditions
1362. Real-time activity of radio amateurs
1363. Real-time band conditions
1364. Real-time band conditions for ham radio
1365. Real-time data
1366. Real-time DX data
1367. Real-time DX propagation conditions
1368. Real-time DX reports * HF propagation prediction
1369. Real-time f0F2 map
1370. Real-time forecast of HF radio propagation
1371. Real-time ham band activity using the internet
1372. Real-time HF band activity
1373. Real-time HF band conditions
1374. Real-time HF band conditions' chart
1375. Real-time HF DX Propagation Prediction
1376. Real-time HF propagation charts
1377. Real-time HF propagation maps
1378. Real-time HF propagation prediction
1379. Real-time HF propagation reports (depending on ham band activities)
1380. Real-time HF propagation reports (ham activity and solar terrestrial data)
1381. Real-time HF Propagation Space Weather
1382. Real-time ionogram
1383. Real-time LUF Conditions
1384. Real-time maps and lists of ham radio activity
1385. Real-time MUF 3000 km propagation map
1386. Real-time MUF conditions
1387. Real-time MUF map
1388. Real-time NVIS map
1389. Real-time propagation and band conditions
1390. Real-time propagation charts
1391. Real-time propagation charts for HF radio ↗↗
1392. Real-time propagation conditions
1393. Real-time propagation maps and charts
1394. Real-time radio propagation maps
1395. Real-time radio propagation reports
1396. Real-time reports HF propagation
1397. Real-time reports of space weather
1398. Realtime skywave propagation reports
1399. Real-time solar flare
1400. Real-time space weather reports—Explanation
1401. Real-Time Sun & Moon Positions
1402. Real-time sunspots number
1403. Real-time watching of worldwide ham activity
1404. Real-time watching of worldwide hams' activity
1405. Reasons for Closed HF Bands
1406. Recent geomagnetic storms
1407. Recent geophysical & solar observations
1408. Recent Kp
1409. Recent LUF conditions
1410. Recent LUF map
1411. Recent LUF propagation
1412. Recent MUF distribution
1413. Recent observations - Geo (Terrestrial) & Solar
1414. Recent propagation conditions
1415. Recent R-S-G reports
1416. Recent solar flares
1417. Recent sunspots number
1418. Reciprocal HF propagation
1419. References—internet sources
      • Electromagnetic / Radio Waves properties ► Radio propagation references
      • Ionospheric Propagation references
      • NVIS unique mode of a skywave references
      • Gray line references
      • Propagation Indices references
      • Observations references:
        • Terrestrial magnetometers
        • The Sun
        • Space weather
        • Total Electron Content (TEC)
        • Real-time MUF
        • Propagation charts
      • Solar Phenomena references
      • Space weather phenomena references
      • Space weather references to agencies & services
      • Forecasting and prediction references
      • Tools and applications references for analyzing and forecasting HF propagation
1420. Reflection of radio wave compared to visible light
1421. Refraction of radio wave compared to visible light
1422. Refractive index maps
1423. Refractive index of HF radio in the ionosphere
1424. Regional and global online reports of HF propagation
1425. Regional conditions
1426. Regional HF conditions
1427. Regional MUF and solar indices
1428. Regional propagation
1429. Regional variations of HF propagation explained
1430. Regional variations of HF propagation report
1431. Regional vs. Global HF propgation conditions
1432. Regional vs. Global high frequency propgation conditions
1433. Regions of ionization
1434. Regions of band allocation (ITU region map)
1435. Region vs. Layer: Earth's Atmosphere and Ionosphere
1436. Remote sensing of the ionosphere
1437. Remote receivers, WebSDR and KiwiSDR
1438. Report skywave erratic propagation conditions
1439. Reporters of digital modes—references
1440. Reports of space weather
1441. Reports of Space Weather Conditions (SWx)
1442. Resources for Predicting HF Band Conditions for Ham Radio
1443. RF Basics: Radio Propagation
1444. RF coverage forecast software free
1445. RF coverage prediction software free
1446. RF path software free tools
1447. RF planning and optimization
1448. RF planning tools
1449. RF propagation forecast software
1450. RF propagation mapping software
1451. RF propagation prediction software
1452. RSG scales of Space Weather
 
S
1453. Satellites for space weather observations
1454. S1-S5 - scale of Solar radiation storms
1455. Schedule your QSOs today
1456. SDR spectrum
1457. SDR - Software Defined radio
1458. SDO - Solar Dynamic Obervatory (NASA)
1459. Seasonal phenomena
1460. Seasonal Effects on propagation
1461. Seasonal anomaly of HF propagation
1462. Seasonal & geographical variation of HF propagation
1463. Seasonal variations in HF radio propagation
1464. Seasons affect HF radio propagation
1465. Seeing HF Conditions in Real Time
1466. Selecting techniques for HF radio communication
1467. SEP
1468. Severe geomagnetic storm
1469. SFI
1470. SFI today
1471. SFU
1472. Short wave propagation
1473. Short-term forecast of HF radio propagation
1474. Short-term HF propagation planning
1475. Short-term prediction of HF radio propagation
1476. Shortwave Band Characteristics
1477. Shortwave listening (SWL)
1478. Shortwave radio frequencies — chart
1479. Shortwave propagation
1480. Shortwave propagation conditions
1481. Shortwave propagation conditions map
1482. Shortwave propagation forecast
1483. Shortwave propagation map
1484. Shortwave propagation prediction
1485. Shortwave radio propagation
1486. Shortwave radio propagation today
1487. SID - Sudden ionospheric disturbances
1488. Significance of solar activity for amateur radio
1489. Significant frequencies relevant to skywaves
1490. Significant geomagnetic storms in 2025
1491. Significat radio blackout events during 2024
1492. Simple Ham radio
1493. Skip distance | Skip distance—Skywave
1494. Skip zone
1495. Skip zone and skip distance
1496. Sky propagation advantages
1497. Sky propagation critical frequencies
1498. Sky propagation diagram
1499. Sky wave ionospheric propagation
1500. Sky wave or ionospheric propagation
1501. Sky wave propagation
1502. Sky wave propagation basics
1503. Sky wave propagation basics and tutorials
1504. Sky wave propagation definition
1505. Sky wave propagation diagram
1506. Sky wave propagation example
1507. Sky wave propagation frequency range
1508. Sky wave propagation PDF
1509. Skywave | Skywave / Skip—references
1510. Skywave at night
1511. Skywave concept
1512. Skywave Explained
1513. Skywave frequencies to listen to
1514. Skywave glossary
1515. Skywave HF radio propagation
1516. Skywave multi-refractions
1517. Skywave propagation
1518. Skywave propagation — what is it?
1519. Skywave propagation dynamics
1520. Skywave propagation—AI generated shortcast courtesy of Jean-Paul Suijs, PA9X
1521. Skywave propagation bad conditions
1522. Skywave propagation basics
1523. Skywave propagation charts
1524. Skywave propagation charts tutorial
1525. Skywave propagation conditions
1526. Skywave propagation example
1527. Skywave propagation for hams explained
1528. Skywave propagation for long-distance contact
1529. Skywave propagation for radio amateurs
1530. Skywave propagation forecast
1531. Skywave propagation frequency range
1532. Skaywave propagation indicators
1533. Skaywave propagation indicators for radio amateurs
1534. Skaywave propagation indicators for radio hams
1535. Skywave propagation indices
1536. Skywave propagation metrics
1537. Skywave propagation mathematical models
1538. Skywave propagation modes
1539. Skywave propagation odd conditions
1540. Skywave propagation PDF
1541. Skywave propagation review pdf
1542. Skywave propagation references
1543. Skywave propagation review
1544. Skywave propagation seasonal anomaly
1545. Skywave propagation secrets
1546. Skywave propagation today
1547. Skywave propagation tutorial
1548. Skyware propagation tutorial and practice
1549. Skywave Propagation YouTube
1550. Skywave radio propagation
1551. Software for HF propagation prediction
1552. Solar activity
1553. Solar activity and regions
1554. Solar activity is interfering with radio signals on earth
1555. Solar activity and ham radio propagation
1556. Solar activity & HF propagation
1557. Solar activity & HF radio propagation
1558. Solar activity affects HF propagation
1559. Solar activity affects skywaves
1560. Solar activity and HF propagation
1561. Solar activity and the ionosphere
1562. Solar activity chart over time
1563. Solar activity cycle chart
1564. Solar activity for radio amateurs
1565. Solar activity forecast
1566. Solar activity prediction
1567. Solar activity radio propagation
1568. Solar activity reports
1569. Solar conditions & ham propagation
1570. Solar conditions affect HF radio propagation
1571. Solar conditions and ham propagation
1572. Solar conditions and ham radio propagation
1573. Solar conditions and HF radio propagation
1574. Solar conditions for radio propagation
1575. Solar cycle
1576. Solar Cycle Ham radio
1577. Solar cycle radio amateur propagation
1578. Solar Cycle, status and progression
1579. Solar data
1580. Solar dynamics
1581. Solar Electromagnetic Spectrum
1582. Solar energetic Particle (SEP)
1583. Solar events
1584. Solar events live
1585. Solar flare alert
1586. Solar flare chart
1587. Solar flare forecast
1588. Solar flare history chart
1589. Solar flare interference comparison
1590. Solar flare radiation
1591. Solar flare radiation graph
1592. Solar flare warning
1593. Solar flares
1594. Solar flares and HF fadeouts
1595. Solar flares and HF Propagation
1596. Solar flares and propagation
1597. Solar flares and Radio blackouts
1598. Solar flares hitting earth today
1599. Solar flares today alerts warnings
1600. Solar flares classification chart
1601. Solar flux
1602. Solar flux chart for today
1603. Solar Flux Index (SFI)
1604. Solar flux index chart
1605. Solar flux indices: SF, SSN
1606. Solar flux index HF propagation
1607. Solar flux index today
1608. Solar flux outlook
1609. Solar Flux Today
1610. Solar flux value for today
1611. Solar Flux versus Sunspot Activity
1612. Solar Flux, Sunspots, and Ionizing Radiation
1613. Solar Ham
1614. Solar HF propagation chart
1615. Solar Indices: SSN, Solar Flux
1616. Solar indices and space weather | Solar Indices Explained
1617. Solar indices today
1618. Solar indices what are they?
1619. Solar index propagation chart
1620. Solar index today
1621. Solar maximum
1622. Solar minimum
1623. Solar observations
1624. Solar Particle event (SPE)
1625. Solar phenomena
1626. Solar propagation
1627. Solar propagation data
1628. Solar propagation ham radio
1629. Solar radiation
1630. Solar radio flux
1631. Solar radio interference
1632. Solar regions
1633. Solar regions and activity
1634. Solar region data - Sunspots
1635. Solar spectra
1636. Solar storm ham radio
1637. Solar storm radio amateur
1638. Solar storm today
1639. Solar storm warning today
1640. Solar storms (X-ray flares and particle events)
1641. Solar storms overview
1642. Solar storms consist of solar flares and Coronal Mass Ejections (CME)
1643. Solar storm FAQs: Your top amateur radio questions answered?
1644. Solar storms ham radio
1645. Solar synoptic map
1646. Solar terminator (i.e. Greyline)
1647. Solar terrestrial activity report
1648. Solar Terrestrial Data
1649. Solar terrestrial data explained
1650. Solar UV and X-ray spectral diagnostics (2018)
1651. Solar weather info
1652. Solar weather reports
1653. Solar wind
1654. Solar wind Ham radio
1655. Solar wind real-time dials
1656. Solar wind reports
1657. Solar X-Ray (Phenomenon)
1658. Solar X-ray Imaging system (SXI)
1659. Solar X-Ray flux levels
1660. Solar-terrestrial data and HF propagation
1661. SolarWx
< li>Space propagation | Space wave | Space wave propagation
1662. Space weather a comprehensive tutorial
1663. Space weather agencies & services Worldwide
1664. Space weather alerts
1665. Space weather and amateur radio
1666. Space weather and propagation
1667. Space weather and radio communications
1668. Space weather and radio propagation
1669. Space weather by solar ham
1670. Space weather data and plots
1671. Space weather effects on communication systems
1672. Space weather effects on communications systems (June 2020)
1673. Space weather events
1674. Space weather for Amateur Radio
1675. Space weather forecast
1676. Space weather for radio hams
1677. Space weather forecasting
1678. Space weather ground-based observatories
1679. Space weather ham radio
1680. Space Weather HF propagation
1681. Space Weather HF Radio propagation
1682. Space weather live
1683. Space weather models
1684. Space weather needs of the amateur radio community
1685. Space weather news
1686. Space Weather Nowcast
1687. Space weather observations
1688. Space weather observations from satellites
1689. Space weather overview
1690. Space weather phenomena
1691. Space weather prediction
1692. Space weather prediction center (NOAA)
1693. Space weather predictions for radio amateurs
1694. Space weather real-time 24hr effective sunspot number
1695. Space weather reports
1696. Space weather reports
1697. Space weather scales
1698. Space weather status and alerts
1699. Space weather warning
1700. Space weather warning system
1701. Space weather warning watch
1702. Space weather watch
1703. Space weather watches, warnings and alerts
1704. SPE
1705. Sporadic E (E_s)
1706. Sporadic E multipath
1707. Sporadic E propagation
1708. Spread F
1709. Sprites
1710. SSN
1711. Stanley article of the month (QST-June-2021)
1712. Stratosphere
1713. Sudden Ionospheric Disturbances (SID)
1714. Summary
1715. Sun flare propagation
1716. Sun flare radiation
1717. Sun spots ham radio today
1718. Sunspot cycle
1719. Sunspot index correlation
1720. Sunspot number
1721. Sunspot numbers explained
1722. Sunspots
1723. Sunspots and HF propagation
1724. Sunspots and skywave propagation
1725. Sunspots and solar flares
1726. Sunspots and sun flare
1727. Sunspots and solar flux
1728. Sunspots and the ionosphere
1729. Sunspots ham radio today
1730. Sunspots NOAA predicted sunspot number
1731. Sunspots number
1732. Sunspot number
1733. Sunspots number today
1734. Sunspots explained
1735. Sunspots
1736. Sunspots and solar flux
1737. SuperDARN
1738. Sunlight
1739. Sunspot cycles
1740. Sunspot index since 1750
1741. Sunspot index and long-term solar observations
1742. Sunspot number and radio flux
1743. Sunspot number forecast
1744. Sunspot number prediction
1745. Sunspot propagation chart
1746. Sunspot propagation effects
1747. Sunspots recent days
1748. Sunspot solar cycle 25
1749. Sunspots today
1750. Surface wave propagation
1751. SWPC = Space Weather prediction center (NOAA)
1752. swx — Space Weather Conditions
 
T
1753. T Index concept
1754. T Index map
1755. Table of frequency allocations chart
1756. TEC—Total electron content
1757. Telecommunication Circuit
1758. Telecommunication circuit illustration
1759. Terminator line
1760. Terrestrial geomagnetic indices
1761. Terrestrial observations
1762. The anatomy of a radio signal
1763. The art of HF Frequency Selection
1764. The Basics of HF Progagation
1765. The Big Gun`s Guide to Low Band Propagation: A book by Bob Brown, NM7M (2002)
1766. The current conditions on ham bands
1767. The current propagation conditions
1768. The decline and comeback of skywave HF radio
1769. The effects of weather on amateur radio propagation
1770. The effective ham radio range
1771. The electromagnetic spectrum
1772. The Fast Track to Understanding Ham Radio Propagation
1773. The HF bands assigned to hams
1774. The HF bands assigned to radio amateurs
1775. The HF bands
1776. The HF bands for newcomers
1777. The Holy Cluster
1778. The impact of geomagnetic storms on HF propagation
1779. The importance of frequency management in HF radio communications
1780. The influence of ionospheric electron density fluctuations on HF propagation
1781. The ionosphere
1782. The ionosphere and HF propagation
1783. The ionosphere and skywave propagation
1784. The K-Index and Amateur Radio
1785. The Little Pistol's Guide to HF Propagation by Bob Brown, NM7M, Worldradio Books (1996)
1786. The lowest usable frequecy
1787. The Magic of Aurora
1788. The magnetosphere
1789. The maximum range of ham radios
1790. The most significant blackout event of the 25th solar cycle May 2024
1791. The mystery of HF propagation
1792. The path of wireless communication
1793. The propagation of radio waves
1794. The radio spectrum
1795. The Rebirth of Shortwave radio communication
1796. The rebirth of skywave HF radio
1797. The recent propagation conditions
1798. The recent sunspots number
1799. The relationships between sunspot number and solar radio flux at 10.7 centimeters
1800. The science behind radio wave propagation
1801. The solar cycle | SSN Explained
1802. The solar cycle and sunspots
1803. The Sun and solar activity
1804. The Sun and space weather
1805. The Super Dual Auroral Radar Network (SuperDARN)
1806. The Structure of the Ionosphere
1807. Theory-Based Tutorial on HF Propagation
1808. Thermosphere
1809. TID (Traveling ionospheric disturbances)
1810. Time of day
1811. Time-of-day band selection
1812. Total Electron Content (TEC)
1813. Tools and Applications
1814. Tools and Applications for Monitoring HF Band Conditions
1815. Tools for analyzing and forecasting HF propagation
1816. Total electron content (TEC)
1817. Tracking digital modes
1818. Tracking global beacons
1819. Transmission Angle
1820. Traveling ionospheric disturbances (TID)
1821. Transient Luminous Events (TLEs)
1822. Troposphere
1823. Tropospheric propagation
1824. Tutorial and practice on skywave
1825. Tutorial and practice on skywave prediction
1826. Twilight zone
1827. Types of propagation models
1828. Types of radio wave propagation
1829. Types of signal propagation
 
U
1830. Ultraviolet
1831. Understanding amateur radio bands
1832. Understanding amateur radio NVIS
1833. Understanding and Using Propagation Tools to Plan Your QSOs
1834. Understanding Band Conditions Banners
1835. Understanding current HF band conditions
1836. Understanding geomagnetic indices
1837. Understanding ham bands closed
1838. Understanding ham band conditions banner
1839. Understanding ham band propagation
1840. Understanding ham radio bands
1841. Understanding ham radio frequencies
1842. Understanding ham radio propagation
1843. Understanding ham radio propagation techniques
1844. Understanding HF Propagation: A Review
1845. Understanding HF Propagation: All in One
1846. Understanding HF Propagation for radio hams
1847. Understanding HF propagation numbers
1848. Understanding HF propagation practice
1849. Understanding HF radio propagation
1850. Understanding HF propagation reports
1851. Understanding HF radio systems
1852. Understanding HF skywave propagation
1853. Understanding ionosphere
1854. Understanding K-Index Impact on HF Propagation
1855. Understanding LF and HF propagation, G0KYA, G3NYK, RSGB (2010)
1856. Understanding LUF and MUF
1857. Understanding NVIS
1858. Understanding of Ham radio propagation
1859. Understanding of HF radio propagation
1860. Understanding Propagation of Radio Waves
1861. Understanding Propagation of Skywave
1862. Understanding propagation numbers
1863. Understanding propagation: How space weather affects radio waves
1864. Understanding Propagation: Paul L. Herrman, N0NBH (11-July 2010)
1865. Understanding Propagation: M. Landress, WB5ANN, April 2022
1866. Understanding radio communication systems
1867. Understanding radio propagation
1868. Understanding radio propagation: A graphical perspective
1869. Understanding Radio Waves
1870. Understanding radio waves and their frequencies
1871. Understanding RF propagation: Types and properties
1872. Understanding Radio Waves: Nature and Properties
1873. Understanding Radio Waves and their Frequencies
1874. Understanding Radio Waves: Nature and Properties
1875. Understanding solar storms and how they impact ham radio
1876. Understanding the basics of radio propagation
1877. Understanding skywave propagation
1878. Understanding solar activity and its impact on HF propagation
1879. Understanding solar indices
1880. Understanding space weather indices
1881. Understanding the basics of HF band conditions
1882. Understanding the band conditions banner
1883. Understanding the HF band conditions
1884. Understanding wavelengths and frequencies in ham radio
1885. Usable Frequency Range: from LUF to MUF
1886. Usable HF frequencies
1887. Uses of radio waves
1888. Using HF beacon tracking programs
1889. Using VOACAP for HF radio propagation predictions
1890. Utilize remote receivers
 
V
1891. Validation of HF propagation models
1892. Variations in HF radio propagation
1893. Visualizing HF propagation
1894. Verification of HF propagation models
1895. Very High frequency (VHF)
1896. Very Low frequency (VLF)
1897. VHF propagation map
1898. View HF bands conditions at a glance
1899. Virtual height in wave propagation
1900. Visualizing HF propagation
1901. Voacap HF path prediction maps
1902. VOACAP online
1903. Voacap online HF predictions
1904. VOACAP prediction
1905. VOACAP propagation planner
 
W
1906. Watch Out for Geomagnetic Storms
1907. Wave attenuation and absorption
1908. Wave propagation
1909. Wavelength and Frequency
1910. Wavelength and Propagation
1911. Weather influence on HF radio propagation
1912. WebSDR
1913. What affects HF radio signals?
1914. What affects radio signals?
1915. What affects radio wave propagation?
1916. What are band conditions?
1917. What are band conditions banners?
1918. What are DX clusters?
1919. What are electromagnetic waves?
1920. What are geomagnetic disturbances?
1921. What are geomagnetic indices?
1922. What are geomagnetic storms?
1923. What are ham band conditions?
1924. What are ham bands?
1925. What are ham radio frequency bands?
1926. What are HF band conditions?
1927. What are HF band propagation conditions?
1928. What are ionospheric clouds?
1929. What are ionospheric conditions
1930. What are ionospheric effects?
1931. What are ionospheric models?
1932. What are LUF and MUF?
1933. What are MUF and LUF?
1934. What are propagation indices?
1935. What are radio blackouts?
1936. What are radio waves?
1937. What are radio waves and how do they travel?
1938. What are solar flares?
1939. What are solar storms?
1940. What are space weather scales?
1941. What are sprites in Earth's atmosphere?
1942. What are sunspots?
1943. What are the amateur radio HF band conditions?
1944. What are the basic wave propagation mechanisms?
1945. What are the causes of Sporadic E?
1946. What are the current conditions on ham bands?
1947. What are the current HF propagation conditions?
1948. What are the current shortwave propagation conditions?
1949. What are the disadvantages of HF radio?
1950. What are the different types of ionospheric propagation?
1951. What are the factors affecting HF propagation?
1952. What are the factors affecting ionospheric conditions?
1953. What are the factors affecting skywave propagation?
1954. What are the geomagnetic indices?
1955. What are the ham radio HF band conditions?
1956. What are the HF ham bands?
1957. What are the modes of HF-radio propagation?
1958. What are the modes of radio propagation?
1959. What are the R-S-G scales in space weather?
1960. What are the regions of the ionosphere?
1961. What are the solar indices?
1962. What are the sources of medium and large scale traveling ionospheric disturbances?
1963. What are the three modes of HF-radio propagation?
1964. What bands and modes will give me voice at 5,000 kilometers?
1965. What Bands Are Open Now?
1966. What can we expect from a HF propagation model?
1967. What causes HF propagation conditions to vary periodically in a 27-day cycle?
1968. What causes ionospheric ionization?
1969. What causes the ionosphere to form?
1970. What controls HF propagation under normal conditions?
1971. What do propagation indices mean?
1972. What does it mean when a band is closed?
1973. What does NVIS mean?
1974. What effect does the change of seasons have on HF propagation?
1975. What every ham needs to know about skywave propagation
1976. What does a Grey line mean?
1977. What does the Solar Flux Index mean?
1978. What factors influence HF radio propagation?
1979. What frequency should I use for ham radio?
1980. What ham radio band should I use?
1981. What HF bands are allocated for radio amateurs?
1982. What HF bands are closed now?
1983. What HF bands are open at night?
1984. What HF bands are open now?
1985. What HF frequency should I use?
1986. What impact do solar phenomena like sunspots and solar flares have on radio communications?
1987. What important quality does the ionosphere have?
1988. What is a geomagnetic storm?
1989. What is a good app or website to see HF propagation?
1990. What is a skywave propagation?
1991. What is an electromagnetic (EM) wave?
1992. What is Earth's magnetic field?
1993. What is earth Magnetosphere?
1994. What is fading?
1995. What is Geomagnetic Activity?
1996. What is Geomagnetic Disturbance?
1997. What is ham radio?
1998. What is ham radio and how does it works?
1999. What is ham radio communications?
2000. What is ionization?
2001. What is ionospheric propagation?
2002. What is Grayline propagation?
2003. What is Hale cycle?
2004. What is Ham radio propagation?
2005. What is HF propagation?
2006. What is HF radio propagation?
2007. What is HF radio propagation prediction?
2008. What is HF wave propagation?
2009. What is high-frequency (HF) radio?
2010. What is ionization?
2011. What is K index?
2012. What is LUF?
2013. What is MUF?
2014. What is NVIS?
2015. What is plasma?
2016. What is radio?
2017. What is radio propagation?
2018. What is radio spectrum
2019. What Is radio wave propagation?
2020. What is RF propagation
2021. What is sky propagation?
2022. What Is sky wave propagation?
2023. What Is Skywave propagation?
2024. What is solar activity?
2025. What is solar cycle? | Solar cycles: A tutorial
2026. What is solar wind?
2027. What is space weather?
2028. What is the 80 meter band?
2029. What is the bandwidth of HF radio?
2030. What is the best HF band for daytime?
2031. What is the best HF band for DX?
2032. What is the best time for the 40 meter band?
2033. What is the best time of day for HF frequencies?
2034. What is the best time of day for HF radio?
2035. What is the composition of the ionosphere?
2036. What is the current HF propagation?
2037. What is the current LUF?
2038. What is the current MUF?
2039. What is the current lowest usable frequency (LUF)?
2040. What is the current shortwave propagation conditions?
2041. What is the current skywave propagation conditions?
2042. What is the dead zone in radio communication?
2043. What is the difference between solar proton flux and solar proton density?
2044. What is the difference between Greyline and the Solar Terminator?
2045. What is the difference between Global versus Regional HF propgation conditions?
2046. What is the difference between earth Magnetosphere and Earth's magnetic field?
2047. What is the difference between geomagnetic and ionospheric storms?
2048. What is the difference between solar indices and propagation indices?
2049. What is the D region of the ionosphere?
2050. What is the E region of the ionosphere?
2051. What is the F region of the ionosphere?
2052. What is the farthest a ham radio can reach?
2053. What is the K index for propagation?
2054. What is the longest range 2 way radio?
2055. What is the lowest usable frequency?
2056. What is the LUF frequency?
2057. What is the max radio range?
2058. What is the maximum usable frequency?
2059. What is the most popular ham radio mode?
2060. What is the range of a 100 watt ham radio?
2061. What is the rule of thumb for HF frequency?
2062. What is the skip zone?
2063. What is the solar cycle?
2064. What is the solar index?
2065. What is the structure of the ionosphere?
2066. What is the T Index?
2067. What is Total Electron Content? TEC
2068. What is virtual height?
2069. What is your favorite propagation prediction tool?
2070. Where can I find solar data?
2071. What radio waves actually are?
2072. What the numbers mean in propagation
2073. What to expect from our HF amateur radio bands?
2074. When are HF bands closed?
2075. When will HF band conditions improve?
2076. Which Ham Band is Open Now?
2077. Which ham bands are open now?
2078. Which HF bands are best during the day and which are better at night?
2079. Which ionospheric region is closest to the Earth?
2080. Why are bands bad?
2081. Why are ham bands closed?
2082. Why do we need propagation forecasting?
2083. Why do we need propagation forecasts?
2084. Why forecast HF conditions?
2085. Why is a band closed?
2086. Why is a radio band closed?
2087. Why is HF propagation so poor?
2088. Why is HF used for long range communication?
2089. Why is propagation on shortwave (HF) terrible right now?
2090. Why is shortwave used for long range communication?
2091. Why is there no activity on the HF Radio?
2092. Why Use Propagation Tools?
2093. Wide-band WebSDR
2094. Window of usable frequencies: from LUF to MUF
2095. Wireless Communication Circuit
2096. Wireless communication concept
2097. Wireless transmission concept
2098. Working The Gray Line
2099. Worldwide LUF map
2100. Worldwide MUF chart
2101. WSPR - Weak Signal propagation reporter * WSPR Live * WSPR Rocks
2102. WSPR - Weak Signal Communication—references
2103. WSPR - Weak Signal Propagation Reporter—references
2104. WSPRnet
 
X
2105. X-ray flares review
2106. X-Ray flares what are they?
2107. X-Ray Flux Levels Now
2108. X-Ray Flux Levels Scale

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2109. 6 meter propagation map
2110. 10 meter propagation map
2111. 12 meter propagation map
2112. 15 meter propagation map
2113. 17 meter propagation map
2114. 20 meter propagation map
2115. 30 meter propagation map
2116. 40 meter propagation map
2117. 60 meter propagation map
2118. 80 meter propagation map
2119. 160 meter propagation map
2120. 24-hour HF propagation forecast

Total visits since 17 August 2022.
^{Repeat visits counted as new after 24 hours.}

The number of visits (graphs displayed below) peaked during HF propagation disruptions.

Visits (per day) since 2022

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Visits (per day) during the last 3 months

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Visits (per day) during the last month

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Hourly visits today

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