Open Access
Research Article

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

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.