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Sarrah

29 Dec 2013 14:51



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A History of Solar Activity over Millennia

http://cc.oulu.fi/~usoskin/personal/lrsp-2008-3Color.pdf

"The modern level of solar activity (after the 1940s) is very high, corresponding to a grand maximum. Grand maxima are also rare and irregularly occurring events, though the exact rate of their occurrence is still a subject of debates."