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Since 1610, telescopic sunspot observations have formed one of the longest and most well-studied observation-based indices of solar activity (Clette et al. 2014, 2023; Arlt & Vaquero 2020; Usoskin 2023). Apart from regular solar cycles of each ≈11 yr, these multicentury observations have detected an unusual period, a ‘grand minimum’ in 1645–1715 (Spörer 1889; Maunder 1922; Eddy 1976), which is currently known as the Maunder Minimum (MM).
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