The Maunder Minimum - A reappraisal

Physics

Scientific paper

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49

Secular Variations, Solar Terrestrial Interactions, Sunspot Cycle, Auroras, Minima

Scientific paper

It is demonstrated that neither the claim by Xu and Jiang (1982) nor that by Landsberg (1980) is sufficient to alter Eddy's (1976) quantitative description of the Maunder Minimum. The new Chinese data add no more than three possible sunspots to the 600-1000 that were previously known in the Maunder Minimum years; what is more, the number of 17th-century naked-eye reports decreases after 1640 in the same manner as do known telescopic reports. It is pointed out that the historical sunspots found by Landsberg are almost entirely duplicates of spots included in earlier analyses based on previous studies of the same well-known sources. The main evidence for secular solar variability is the precision record of tree-ring radiocarbon compiled in 1980 by Stuiver and his colleagues. This record establishes an unequivocal drop in solar activity during the Maunder Minimum and on three prior occasions in the current millennium.

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