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Analysis of Ap distributions over 1964–2016. (Top) The fraction of time in each year, f, for which a valid Ap is available. (Middle) Annual probability distribution function (pdfs) of daily-mean Ap (〈Ap〉τ=1day ) are colour coded and the black line gives the annual means of Ap, 〈Ap〉τ=1yr . Probabilities are evaluated in bins of Ap that are 1 nT wide. (Bottom) Annual probability distribution function (pdfs) of normalised daily Ap, 〈Ap〉τ=1day/〈Ap〉τ=1yr , are colour coded and the black gives the annual means of this normalised Ap which are unity. Probabilities are evaluated in bins of normalised Ap that are 0.1 wide.
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