Table 5
Standard deviations and maximum and minimum percentage deviations from unity of observed 3-hourly index sensitivities, S, estimated assuming the am index is ideal for 1959–2017, for low, middle and high geomagnetic activity levels. The bottom two rows give the factor by which the corrected index is improved in terms of the uniformity of its response.
| Index |
am < 8 nT |
8 ≤ am < 30 nT |
am ≥ 30 nT |
||||||
|---|---|---|---|---|---|---|---|---|---|
| Lowest 20% |
Inter 20% |
Largest 20% |
|||||||
| σS (%) | Max (%) | Min (%) | σS (%) | Max (%) | Min (%) | σS (%) | Max (%) | Min (%) | |
| ap | 10.18 | 20.2 | −22.8 | 12.21 | 29.10 | −17.40 | 12.88 | 28.40 | −24.52 |
| apC | 3.07 | 8.10 | −9.40 | 2.27 | 5.52 | −5.73 | 3.85 | 10.62 | −13.73 |
| aa | 12.74 | 39.80 | −20.80 | 11.44 | 40.20 | −20.02 | 9.70 | 34.91 | −18.30 |
| aaH | 2.37 | 8.11 | −5.80 | 1.41 | 4.94 | −3.05 | 2.51 | 6.31 | −8.49 |
| Ratios of values for uncorrected indices to those for corrected | |||||||||
| For apC | 3.32 | 2.49 | 2.43 | 9.34 | 5.27 | 3.04 | 3.35 | 2.67 | 1.79 |
| For aaH | 5.38 | 4.91 | 3.59 | 8.11 | 9.96 | 6.56 | 3.86 | 5.53 | 2.16 |
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