Same as Figure 5 for the estimated power input into the magnetosphere, Pα. (Top) The fraction of time in each year, f, for which a valid Pα value is available. (Middle) Annual probability distribution function (pdfs) of daily means of Pα/Po (〈Pα〉_τ=1day/Po ) are colour coded and the black line gives the annual means of 〈Pα〉_τ=1yr/Po . Probabilities are evaluated in bins of Pα/Po that are 0.1 wide and years for which f < 0.5 are omitted. (Bottom) Annual probability distribution function (pdfs) of normalised daily Pα, 〈Pα〉_τ=1day/〈Pα〉_τ=1yr , are colour coded and the black gives the annual means of this normalised Pα which is unity. Probabilities are evaluated in bins of normalised Pα that are 0.1 wide.