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sunspot cycle |
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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. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| In this instance, Lerner includes the sunspot cycle. During periods of increased solar activity, particularly during high-points of the 11-year sunspot cycle, these breathtaking sky shows often appear far south of their normal Arctic venues. The total energy of the sun would have been varying by several percent over a time scale of a few years, during the sunspot cycle. |
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