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F-UT patterns of mean values for (top row) the normalized power input into the magnetosphere, Pα/Po; (middle row) the am index and (bottom row) the southward field in the GSEQ frame, [BS]GSEQ. The data are 3-hour averages for 1995–2017, inclusive, and are averaged into 36 equal sized bins in F and the 8 UT time ranges over which the am index is derived. For the IMF data used (Pα/Po, [BY]GSEQ, [BS]GSEQ) the 3-hour averaging windows were moved forward by 1 h to allow for the average response delay of am to the interplanetary conditions. Plots in the left-hand column are for all data, plots in the middle column are for [BY]GSEQ > 0, and plots in the right-hand column are for [BY]GSEQ < 0.
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