Solar cycle (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Solar cycle" in English language version.

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  • Schwabe (1843). "Sonnenbeobachtungen im Jahre 1843" [Observations of the sun in the year 1843]. Astronomische Nachrichten (in German). 21: 233–236. From page 235: "Vergleicht man nun die Zahl der Gruppen und der flecken-freien Tage mit einander, so findet man, dass die Sonnenflecken eine Periode von ungefähr 10 Jahren hatten" ('If one compares the number of groups [of sunspots] and the sunspot-free days with one another, then one finds that the sunspots had a period of about 10 years')

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  • Damon, Paul E., and Sonett, Charles P., "Solar and terrestrial components of the atmospheric C-14 variation spectrum," In The Sun in Time, Vol. 1, pp. 360–388, University of Arizona Press, Tucson AZ (1991). Abstract (accessed 16 July 2015)

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  • "NASA/Marshall Solar Physics". nasa.gov. Retrieved 2015-11-17. Public Domain This article incorporates text from this source, which is in the public domain.[dead link]

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