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Variations with time of values over half-year intervals (centred on the equinoxes) for the 1996–2018 interval used in Figure A1. (a). The sunspot number, R. (b) The polar field strength from Wilcox Solar Observatory (WSO) magnetograms, Bp, where red/blue is for the north/south solar pole, respectively. (c) The fraction of time f that the IMF has [BY]GSEQ > 0 polarity (mauve line with open circles) and [BY]GSEQ < 0 polarity (green line with solid triangles). (d) The number of 1-minute samples of [BY]GSEQ in bins 1 nT wide and 6-month intervals centred on the equinoxes, N to as a function of date and [BY]GSEQ (plotted on a logarithmic colour scale to reveal the tails of the distributions as well as the peaks). The vertical grey lines mark the polarity reversals of the solar polar fields
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