Difference between revisions of "Sunspot cycle"
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| − | The '''sunspot cycle''' is a periodic variation in the number of [[sunspots]]. Over the last {{years ago|1755}}, 23 of these have been observed with an average length of 11 years. | + | The '''sunspot cycle''' is a periodic variation in the number of [[sunspots]]. Over the last {{years ago|1755}}, 23 of these have been observed with an average length of 11 years.<ref>"The number of sunspots reaches a maximum about every 11 years ..." [http://zebu.uoregon.edu/~soper/Sun/cycle.html Davison E. Soper, Institute of Theoretical Science, University of Oregon] |
Revision as of 15:53, March 30, 2010
The sunspot cycle is a periodic variation in the number of sunspots. Over the last 271, 23 of these have been observed with an average length of 11 years.<ref>"The number of sunspots reaches a maximum about every 11 years ..." Davison E. Soper, Institute of Theoretical Science, University of Oregon