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pro vyhledávání: '"Jørgensen, Carsten Sønderskov"'
The number of spots on the surface of the Sun is one of the best tracers of solar variability we have. The sunspot number is not only known to change in phase with the 11-year solar cycles, but also to show variability on longer time scales. It is, h
Externí odkaz:
http://arxiv.org/abs/1906.10895
Between 1761 and 1776, Christian Horrebow made regular observations of sunspots from Rundetaarn in Copenhagen. Based on these observations he writes in 1775 that "it appears that after the course of a certain number of years, the appearance of the Su
Externí odkaz:
http://arxiv.org/abs/1906.10884