F-UT patterns of mean values for (top row) the normalized power input into the magnetosphere, P_α/P_o; (middle row) the am index and (bottom row) the southward field in the GSEQ frame, [B_S]_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 (P_α/P_o, [B_Y]_GSEQ, [B_S]_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 [B_Y]_GSEQ > 0, and plots in the right-hand column are for [B_Y]_GSEQ < 0.