Identification of the Russell-McPherron effect using the polarity of the IMF [B_Y]_GSEQ component. The left-hand column is for all data, the middle column for [B_Y]_GSEQ > 0 and the right-hand column for [B_Y]_GSEQ < 0. The top row shows annual means of am and P_α divided by their overall means for the whole interval: respectively, <am>_1yr/<am>_all (mauve lines) and <P_α>_1yr/P_o (black lines). The middle row shows the variations of P_α/P_o as a function of fraction-of-year, F and year, <P_α>_F/<P_α>_1yr and the bottom row the same for am, <am>_F/<am>_1yr. As for Figure 10, data are for 1995–2017 and have been averaged into 36-equal width bins of F in each year, and a 3-point running mean applied to the time series to smooth the data.