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Sunspot numbers and proton events in solar cycles 19 to 24

Bromage, B. J. I.; Birch, M. J.

In this study we compare the mean annual sunspot numbers for the six most recent solar cycles (19 to 24) with the number of solar energetic proton events occurring in those years. Though most of the individual cycles exhibit quite strong correlations, when they are combined into a generic solar cycle the result is very significant (ρ = 0.98). For …