During last nights excellent DX presentation by Steve Smith (KG5VK) he discussed propagation and mentioned solar index as well as the A and K index. If you have visited HAM radio related sites you have probably seen a graphic similar to the one below.
It was created by Paul? Herrman (N0NBH) and it's very busy with A LOT of info. Knowing what all the numbers mean and what is good vs what is bad can be difficult to figure out on your own. I found a pretty good article that explains a lot of the info on this graphic but most importantly, it tells what are GOOD numbers vs BAD numbers. So, enjoy!
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73
William Collier
KG5SVM