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wolf number

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Wolf number

[woolf; Fr. vawlf]
–noun Astronomy.
a number indicating the degree of sunspot activity on the sun as a factor of observer idiosyncrasies, the number of sunspot groups, and the number of individual sunspots.


Origin:
1975–80; after Rudolf Wolf (1816–93), Swiss astronomer
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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