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Spörer's law
Empirical law for solar active regions From Wikipedia, the free encyclopedia
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In solar physics, Spörer's law is an empirical law for the variation of heliographic latitudes at which solar active regions form during a solar cycle.[1] It was discovered by the English astronomer Richard Christopher Carrington around 1861.[2] Carrington's work was refined by the German astronomer Gustav Spörer.

At the start of a solar cycle, active regions tend to appear around 30° to 45° latitude on the Sun's surface. As the cycle progresses, they appear at lower and lower latitudes, until they average 15° at solar maximum. The average latitude then continues to drift lower, down to about 7° and then while the old sunspot cycle fades, active regions of the new cycle start appearing at high latitudes.[3]
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