An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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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.

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