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Sunspot cycle
SUNSPOT CYCLE

Definition: The roughly periodic variation in the number of sunspots, reaching a maximum, on an average, every 11 years, and accompanied by a reversal of magnetic polarity for the spots in the northern and southern hemispheres, which has not yet been satisfactorily explained. Sunspots are only one form of solar activity.
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... not applicable.


See perfect number (1).

See perfect variation (1).
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See perfect accompaniment (1).

See perfect characteristic (1).
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See perfect wonder (4).

See perfect intervals.

See perfect puzzle (4).

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