Fig. 4


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Time series of 1-CR averages over the period 1975–2018. Solar cycles 21, 22, 23, and 24 have been coloured black, red, blue, and white, respectively. Top: sunspot number. Middle: the median value of V0V7, the solar wind speed difference between the equator and 7° latitude. Bottom: the inter-quartile range of V0V7.

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