"Mike Terry" wrote...
Solar-terrestrial indices for 17 July follow. Solar flux 149 and
mid-latitude A-index 23. The mid-latitude K-index at 1800 UTC on 18 July was
1 (6 nT). Space weather for the past 24 hours has been minor. Radio
blackouts reaching the R1 level occurred. Space weather for the next 24
hours is expected to be moderate. Radio blackouts reaching the R2 level are
expected.

More on propagation http://www.dxing.info/



I have the vaguest concept of the meaning of these indices. I read somewhere that
a general rule is if the A index is 15 or less and the K index is 5 or less listening will
be ok. But I've never seen a guide about Solar Flux numbers. What's a "good" number
for SF?