An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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smoothed sunspot number (SSN)
  شمار ِ همواریده‌ی ِ هورلک‌ها  
šomâr-e hamvâride-ye hurlakhâ
Fr.: nombre de taches solaires lissé  

An average of 13 monthly → sunspot numbers, centered on the month of concern. The 1st and 13th months are given a weight of 0.5.

See also: → smooth; → sunspot; → number.