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.
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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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