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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
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