Grand Unification: Heliometeorology

Solar Cycles

The sun has solar cycles that repeat approximately every 11 years. The discovery of the sun’s cycles started with the discovery of sunspots. Early observers of the sun noted dark spots on the surface of the sun — especially at sunrise or sunset. Some people started counting and record their numbers. Good historical data dates back to about 1749. If you plot the number of sunspots since then, you get a chart like the one below.

via Grand Unification: Heliometeorology.

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