Bands of range values used to generate quantized K-indices for a station with a lower limit of the K = 9 band of L. ΔH X or Y is the range between extreme values in the 3-hour intervals of the northward or westward horizontal component, whichever is the larger. The right hand column gives the quantized aK values ascribed to the K-levels using the “K2aK” or “mid-class amplitudes” scale.
|K value||Range band||aK (nT)|
|0||0 ≤ ΔH X or Y < 0.01L||2.3|
|1||0.01L ≤ ΔH X or Y < 0.02L||7.3|
|2||0.02L ≤ ΔH X or Y < 0.04L||15|
|3||0.04L ≤ ΔH X or Y < 0.08L||30|
|4||0.08L ≤ ΔH X or Y < 0.14L||55|
|5||0.14L ≤ ΔH X or Y < 0.24L||95|
|6||0.24L ≤ ΔH X or Y < 0.40L||160|
|7||0.40L ≤ ΔH X or Y < 0.66L||265|
|8||0.66L ≤ ΔH X or Y < L||415|
|9||ΔH X or Y ≥ L||667|
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