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sunspot cycle
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noun Astronomy.
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.
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Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use sunspot cycle in a sentence
The sunspot cycle has appeared to average 11.2 years in length, and has been called the 11-year cycle.
Climatic Changes|Ellsworth HuntingtonThe last sunspot cycle had the highest maximum of any since 1780, but the present cycle bids fair to set an all time record.
Disturbing Sun|Robert Shirley RichardsonAlso the present sunspot cycle started its rise to maximum about 1954.
Disturbing Sun|Robert Shirley Richardson