sunspot cycle


nounAstronomy.
  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.

Words Nearby sunspot cycle

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

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 Huntington
  • The 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 Richardson
  • Also the present sunspot cycle started its rise to maximum about 1954.

    Disturbing Sun | Robert Shirley Richardson