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The annual variations of observed am index and inferred power input to the magnetosphere, P α , comparing the solstices in particular. (a) the daily sunspot number, R; (b) the normalised average am index 〈am〉F/〈am〉yr, where 〈am〉F is the average am in 36 equal-bin widths of fraction of year, F, in each year and 〈am〉yr is the average am for that year, color-coded as a function of F and year; (c) the corresponding plot for the power input to the magnetosphere 〈P α 〉F/〈P α 〉yr; (d) a comparison of the means of am in quarter-year intervals around the June and December solstices, 〈am〉jun and 〈am〉dec respectively: the annual value of the ratio r sol(am) is plotted as red/blue bars for years when it was positive/negative, respectively, where r sol(am) = (〈am〉jun − 〈am〉dec)/(〈am〉jun + 〈am〉dec); (e) a comparison of the corresponding ratio for power input to the magnetosphere r sol(P α ) = (〈P α 〉jun − 〈P α 〉dec)/(〈P α 〉jun + 〈P α 〉dec). (f) shows the difference, r sol(am) − r sol(P α ).
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