Astron.
the variation of sunspots, prominences, flares, and other solar activity through an 11-year cycle. Also called solar activity cycle . Cf. sunspot cycle .
Astron.
the variation of sunspots, prominences, flares, and other solar activity through an 11-year cycle. Also called solar activity cycle . Cf. sunspot cycle .
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012