太陽活動周期リスト - Wikipedia^ Kane, R.P. (2002). "Some Implications Using the Group Sunspot Number Reconstruction". Solar Physics 205(2), 383-401. ^ "Did You Say the Sun Has Spots?". Space Today Online. ^ Phillips, A. (2008). "Solar Cycle 24 Begins". Science @ NASA. ^ SIDC Monthly Smoothed Sunspot Number. "[1]" ^ Monthly solar cycle data. "[2]" ^ Solar Cycle Progression: Recent Solar Indices. "“アーカイブã•ã‚ŒãŸã‚³ãƒ”ーâ€. 2010å¹´4月3日時点ã®ã‚ªãƒªã‚¸ãƒŠ
Tromsø LIVE Northern Lights (Aurora Borealis) solar activity, prediction and forecast | Virtual Tromsø - the best (unofficial) tourist guide to Tromsø
AGU - American Geophysical Union
http://www.swpc.noaa.gov/NOAAscales/index.html
http://www.lizard-tail.com/spacecluster/%E3%83%A1%E3%82%A4%E3%83%B3%E3%83%9A%E3%83%BC%E3%82%B8
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