* K index: LOW is GOOD.
o 0 or 1 is BEST
o 2 is OK
o 3 or more is BAD
o 5 is VERY VERY BAD
* A index: LOW is GOOD.
o 1 to 6 is BEST
o 7 to 9 is OK
o 11 or more is BAD
* Solar Flux Index: HIGH is GOOD.
o 70 NOT GOOD
o 80 GOOD
o 90 BETTER
o 100+ BEST