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Fig. 8


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(Grey histograms) Average pdfs for all years of (a) 〈Ap〉τ=1day/〈Ap〉τ=1yr and (b) 〈τ=1day/〈τ=1yr . In each case the best-fit lognormal distribution is shown, with mean of unity (by definition) and a variance v = 0.934 in (a) and v =0.913 in (b). Distributions for individual years (not shown) are a bit noisier, particularly for 〈τ=1day/〈τ=1yr in years when data availability f is low, but give very similar best fit v values, as indicated by the horizontal uniformity of the bottom panels of figures (6) and (7): for the annual normalised Ap distributions, the mean ± 1 standard deviation of the fitted v values for the 53 years is 0.934 ± 0.031; for the annual normalised distributions, v values for the 31 years with f > 0.5 is 0.915 ± 0.025.

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