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Fig. 6

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(A) Time series of the aa geomagnetic index (black), from 1867–2014, with the maxima of great geomagnetic storms marked by red circles. Also shown are the timings of known GLE events (cyan lines). Panel (B) Shows the same data as (A), except as a function of Schwabe cycle phase. Panel (C) Shows the same data as (A), except as a function of polarity cycle phase. We note that, due to the availability of 10Be data, we only use the geomagnetic and GLE observations up until 1983.

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