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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Solar cycle 21 ： ウィキペディア英語版 Solar cycle 21 Solar cycle 21 was the 21st 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 10.3 years, beginning in June 1976 and ending in September 1986. The maximum smoothed sunspot number (monthly number of sunspots averaged over a twelve-month period) observed during the solar cycle was 164.5, in December 1979 (the second-highest peak on record), and the minimum was 12.3.〔SIDC Monthly Smoothed Sunspot Number. "()"〕 There were a total of 273 days with no sunspots during this cycle.〔Spotless Days. "()"〕〔What's Wrong with the Sun? (Nothing) more information: Spotless Days. "()"〕〔Solaemon's Spotless Days Page. "()"〕 The largest solar flare of this cycle (X15) occurred on July 11, 1978.〔(【引用サイトリンク】title=The Most Powerful Solar Flares ever Recorded )〕 ==See also== *Solar variation *List of solar cycles 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Solar cycle 21」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.