Fig. 1
Monthly mean (gray) and the 13-month gliding averaged (red) sunspot number and the >1-GV fluences of all GLEs observed since 1956 (blue boxes) for which the NM statistics allows the determination of the spectral parameters of fluence. The >1-GV fluences of sub-GLEs of SC 23 and 24 (see Sect. 4.1) are included (red boxes) as well.
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