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Source:
A Dictionary of Weather
Author(s):

Storm Dunlop

sunspot 

A relatively dark area on the Sun's surface. The centre of a sunspot is at a temperature of c.4 500 K, and therefore appears darker than the surrounding photosphere, which has a temperature of approximately 5 800 K. Sunspot numbers vary with the solar cycle and act as one indicator of fluctuations in solar activity.

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