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DX-midAMerica.com


DX-midAMerica.com/
A/K Index
The Earth's magnetic field is always monitored by a network of magnetometers. These readings are converted into the A and K index values, noted hourly on WWV at :18 after the hour. .
"K" index is computed once every three hours or eight times a day, and the values can range from 0 to 9, with 0 being inactive, and 9 representing an extreme severe storm condition.
K index:
0 Inactive
1 Very quiet
2 Quiet
3 Unsettled
4 Active
5 Minor storm
6 Major storm
7 Severe storm
8 Very severe storm
9 Extremely severe storm


"A" index is linear, and is computed from the eight previous "K" index values. It ranges from 0, which is "quiet", to 400, a "severe storm."
A index:
0 - 7 Quiet
8 - 15 Unsettled
8 - 15 Unsettled
16 - 29 Active
30 - 49 Minor storm
50 - 99 Major storm
100 - 400 Severe storm