Wolf number

[ woolf; French vawlf ]

nounAstronomy.

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 of Wolf number

¹

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

Also called relative sunspot number, sunspot number.

Words Nearby Wolf number

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use Wolf number in a sentence

Wolf number one went down with a blow which killed him at once.
Father Bear and Bobby Bear | Howard B. Famous

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