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solar cycle

noun, Astronomy
the variation of sunspots, prominences, flares, and other solar activity through an 11-year cycle.
Also called solar activity cycle.
Compare sunspot cycle. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for solar cycle
  • Side-by-side views of the sun two years ago and the sun now show what a difference a solar cycle makes.
  • Sometimes, though, the sun sulks and this solar cycle stops.
  • However, the details of the solar cycle remain basically unpredictable.
  • At some stages of the solar cycle, these holes are continuously visible at the solar north and south poles.

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