sunspot cycle
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.
Compare
solar cycle.
Words nearby sunspot cycle
sunshine law,
sunshine state,
sunsick,
sunspace,
sunspot,
sunspot cycle,
sunspots,
sunstar,
sunstone,
sunstroke,
sunstruck