Understanding Solar Data

INTERPRETATION OF SOLAR DATA

A Index
1-6 BEST
7-9 FAIR
11+ BAD
Represents overall geomagnetic condition of the ionosphere over a given 24 hour period.
K Index
0 or 1 BEST
2 OKAY
3+ BAD
5 VERY BAD
This is the overall geomagnetic condition of the ionosphere averaged over the planet over the past 3 hours.
K index indicates geomagnetic storms. Below 10 MHz, K of 5+ increases noise level appreciably, K of 7+ degrades HF significantly.
SFI
70 NOT GOOD
80 GOOD
90 BETTER
100+ BEST
SFI is the Solar Flux Index and is a measure of total radio emissions from the sun.
Notes
Higher Solar Flux generally suggests better propagation on the 10, 12, 15, 17, & 20 Meter Bands. Solar Flux rarely affects the 30, 40, 60, 80, & 160
Generally, propagation conditions are best when the A index is 10 or lower, and the K index is 3 or lower.
SFI Solar Flux Index: When >70 then 20m opens. When > 90 then 15m opens.
X-Ray : Solar X-Ray emissions will cause shortwave fadeout. Classification from weak to strong X-Ray emissions : A, B, C, M, X
During a solar X-ray outburst, the lower frequencies are the first to suffer, with subsequent fading up the frequency spectrum over a short period (usually less than a hour). Signals crossing daylight paths will be the most affected (obviously as X-Rays come from the sun).
 * Mid South Coast Amateur Radio Club Inc

What Makes-a Radio Club Successful?

“Healthy radio clubs are vitally important to the future of Amateur Radio. It is the club that often provides the motivation and support for such fundamental activities as recruiting new hams, sponsoring radio classes and doing volunteer testing. Clubs are often the best organizers and financers of expensive repeater systems, hamfests and emergency communication programs, as well.  If the main action in your club is drinking coffee, its future is doomed!”

For more info on this subject see below link:

Tips and Tonics for Healthier Radio Clubs