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Fig. 19

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Analysis of the effects on am of (left column) power input to the magnetosphere Pα/Po at a given solar wind dynamic pressure pSW and of (right column) the effects of pSW at a given Pα/Po. Values of am/<am>all are plotted as a function of corresponding normalised values of (left) Pα and (right) pSW. In (a) data are averaged into 5 quantile ranges of the normalised solar wind dynamic pressure pSW/<pSW>all, 36 bins of time-of-year F, and by the polarity of the IMF Y component in GSEQ, [BY]GSEQ: the means of am/<am>all are plotted against the corresponding means of Pα/Po. In (b) data are averaged into 5 quantiles of normalised power input to the magnetosphere Pα/Po, 36 bins of time-of-year F, and by the [BY]GSEQ polarity and the means of am/<am>all are plotted against the corresponding means of pSW/<pSW>all. The black lines in the upper panels are 3rd-order polynomial fits in each case, fitted to data for all [BY]GSEQ drawn over the range of the averaged data for the quantile range in question. The points are coloured according to the quantile range as given by the key. The lines are also plotted (this time using the same colours as the points in the upper panels) in the corresponding lower panel. The grey points show a scatter plot of all 10-day average values.

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