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Last Post 3/20/2018 7:22 AM by Alessandra Pacini

sunspots

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Vicki R

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3/20/2018 6:13 AM
Hello, When was the cycle concerning sunspots, as to their highs or lows first noticed?

Alessandra Pacini

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3/20/2018 7:22 AM
Hi, Vicki! The first registers of sunspots were made by the Chineses more than 3 thousands years ago. But only in 1843, somebody (the German Heinrich Schwabe) noticed that the occurrence of the observed sunspot was following a cyclic pattern with period of 11 years, more or less. This cycle is known as Schwabe cycle, or solar cycle.