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Fig. 12

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Annual pdfs and mean values of the normalised power input to the magnetosphere, /Po for 1612–2015 and for the best-fit coupling exponent for the Ap index of 0.53. The colour contours give the pdf, evaluated for bins in /Po that are of width 0.01. The Po used here is the average value of from spacecraft measurements over 1964–2016 (inclusive).

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