# Cycle 24 Bad for 10 Meters??? Info from past solarcycles you need to know!

Great info for new hams and for general learning of sunspots

 Believe it or not sunspots can be bad for the 10 meter band You must understand what works and does not work when sunspots appear in cycle 24 Mike the DX editor from 10-10 International has broke the numbers down You will see that solar flares will kill the band but read the info below The more you learn about FLUX the more you will understand how sunspots help Bobby, You have asked a simple question that has a very complicated answer. To have good propagation you need the flux over 100. Remember there are three numbers given out by NOAA when the flux conditions are presented daily. The flux comes first, then the A index and then the K index. The A for absorption is complicated and can range from zero to over a hundred. The bigger the number the more the atmosphere absorbs the radio waves or lets them go through the atmosphere without bouncing off, they just keep going to outer space. The K is an average of the A over some period of hours/days of the A index but the scale is different and I do not remember the range, zero to some number. The larger the K the worst the signal will be propagated. So you want a higher flux, with an A and K that are zero for so called perfect conditions. But that hardly ever happens when the flux gets over a hundred but sometimes. So A less than 12-15 are very good with a K of less than 0-3. So A less than 15-20 moderate with a K of less than 2-5. But things change when the flux rises, there are three stages/ranges that appear and when you get past 100 and have more true F layer skip the complex mix of there three combinations: flux, A and K get complex. So just rely on the flux being high, 100-200 and you will have a good day on the radio. Enough for a complex subject. Happy New Year 2009. 73 Mike N5MT Ok here is a good day on the 10 meter band with cycle 24 Sunspot Number #150 or higher Solar Flux #100 to #200 A and K Index of #0 USE BELOW IMAGE FOR IDEAL 10 METER BAND CONDITIONS

Last Updated 01-02-2009

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