An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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Spörer minimum
  کمینه‌ی ِ اشپورر  
kamine-ye Spörer
Fr.: minimum de Spörer  

A period of low → solar activity that lasted from about A.D. 1420 to 1570. It occurred before → sunspots had been studied, and was discovered by analysis of the proportion of carbon-14 in tree rings, which is strongly correlated with solar activity.

See also: Named for the German astronomer Gustav Spörer (1822-1895);
→ minimum.