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Table 3

Uniformity of average time-of-day/time-of-year response, Sav(UT, F), of the various mid-latitude geomagnetic range indices.

Index Rank Start date Method F bin size Vav Largest positive % deviation of Sav(F, UT) from the mean Largest negative % deviation of Sav(F, UT) from the mean
am 1 1959 Model 1 day 0.65 1.4 −1.2
apC 2 1932 Data 0.05 year 1.78 5.0 −4.6
aaH 3 1868 Data 0.05 year 5.54 12.6 −12.3
aa 4 1868 Data 0.05 year 10.62 40.8 −17.0
aa 1868 Model 1 day 8.95 29.0 −16.8
ap 5 1932 Data 0.05 year 11.20 25.4 −21.6

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