sunspot-number

sunspot number

noun Astronomy.
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Wolf number

[woolf; French 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.
Also called relative sunspot number, sunspot number.


Origin:
1975–80; after Rudolf Wolf (1816–93), Swiss astronomer

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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