Table 1
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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