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Fig. 1

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Distributions of normalised daily means of near-Earth solar wind parameters for the near-continuous interplanetary data for 1996–2016 (inclusive) for: (a). the solar wind speed, Vsw/<Vsw>τ=1yr; (b). the square of the solar wind, Vsw2/<Vsw2>τ=1yr; (c). the solar wind number density, Nsw/<Nsw>τ=1yr; (d). the solar wind kinetic energy density, NswVsw2/<Nsw Vsw2>τ=1yr (the other terms cancel on normalisation if the mean ion mass is assumed constant); (e). the interplanetary magnetic field strength, B/<B>τ=1yr; and (f). the power input into the magnetosphere, Pα/<Pα>τ=1yr. In each case the blue histogram gives the occurrence in bins 0.1 wide and the mauve line is the best-fit lognormal distribution, which has a mean of m = 1 and a variance v, the best-fit value of which is given in each case.

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