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sunspot cycle

noun, Astronomy
1.
the cycle, averaging in duration slightly more than 11 years, in which the frequency of sunspots varies from a maximum to a minimum and back to a maximum again.
Compare solar cycle.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for sunspot cycle
  • Even the occasional sunspot now is often tied in with the last sunspot cycle.

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