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sunspot cycle

   Also found in: Wikipedia 0.02 sec.
sunspot cycle [′sən‚spät ‚sī·kəl]
(astronomy)
Variation of the size and number of sunspots in an 11-year cycle which is shared by all other forms of solar activity.
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Odds favor “Agtastrophe” Now, the sunspot cycle isn’t anything new.
Five reasons to buy agriculture stocks now by Andrew Mickey / Stockhouse
But the reality is that the phenomenon is part of a natural 11-year repeating sunspot cycle that fluctuates from intense activity to no activity and back again about every six years.
A QUIET SUN; LOW SUNSPOT CYCLE FASCINATES SCIENTISTS WHO SAY THERE'S ... by The Santa Fe New Mexican (Santa Fe, NM)
Observers following the state of white-light solar activity have plenty of viewing hours, but continue to report little in the way of signs that the new sunspot cycle 24 is taking off: by some past, optimistic forecasts, it was anticipated that we would by now be seeing a rash of new high-latitude spots.
Sun and Moon by Bone, Neil / Journal of the British Astronomical Association
 
 
 
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