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Solar cycle 2 : ウィキペディア英語版 | Solar cycle 2
Solar cycle 2 was the second solar cycle since 1755, when extensive recording of solar sunspot activity began.〔Kane, R.P. (2002). "(Some Implications Using the Group Sunspot Number Reconstruction )". ''Solar Physics'' 205(2), 383-401.〕〔(【引用サイトリンク】 url=http://www.spacetoday.org/SolSys/Sun/Sunspots.html )〕 The solar cycle lasted 9 years, beginning in June 1766 and ending in June 1775. The maximum smoothed sunspot number (monthly number of sunspots averaged over a twelve-month period) observed during the solar cycle was 115.8 (September 1769), and the minimum was 7.2.〔SIDC Monthly Smoothed Sunspot Number. "()"〕 Sunspot observations by Alexander Wilson during this period established the Wilson effect. ==See also==
*Solar variation *List of solar cycles
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