| 单词 | sunspot cycle |
| 释义 | > as lemmassunspot cycle sunspot cycle n. the recurring increase and decrease in the number of sunspots, with a period averaging approximately eleven years.A cycle is held to begin at the point when sunspot activity is at a minimum. ΘΚΠ the world > the universe > sun > solar activity > [noun] > mark on sun > sunspot > recurrence of sunspot cycle1922 1873 Proc. Amer. Philos. Soc. 1871–2 12 159 Mr. Chase communicated a Note on the Pluvial Indications of the Metonic and Sun-spot Cycles. 1922 H. S. Jones Gen. Astron. v. 126 There is a remarkable connection between the Sun-spot cycle and the occurrence of magnetic storms on the Earth. 2016 C. T. Russell et al. Space Physics iv. 109/2 The duration of the sunspot cycle can be a few years more or less than the nominal 11 years, and,..it takes two adjacent sunspot cycles to make one magnetic cycle. < as lemmas |
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