An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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Wolf number
  عدد ِ وُلف  
adad-e Wolf
Fr.: nombre de Wolf  

A number indicating the degree of → sunspot  → activity. Same as → sunspot number and → relative sunspot number.

See also: Named after Johann Rudolf Wolf of Zurich who introduced the number in 1852; → number.