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Last Post 20 Mar 2018 08:22 AM by  Alessandra Pacini
sunspots
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Vicki R





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20 Mar 2018 07:13 AM
    Hello,

    When was the cycle concerning sunspots, as to their highs or lows first noticed?


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    Posts:13
    >5 Answers


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    20 Mar 2018 08:22 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.
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