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
Examples of 'sunspot cycle' in a sentence
sunspot cycle
The 11-year sunspot cycle also appears not to be linked to global warming.
Times, Sunday Times (2006)
But it has now woken up again and a new sunspot cycle spluttered into life.
Times, Sunday Times (2008)
If so, sunspot cycles could be used to predict floods and subsequent disease outbreaks in the region.