Difference between revisions of "Sunspot cycle"
Jump to navigation
Jump to search
(ref for 11-year cycle) |
m |
||
| Line 1: | Line 1: | ||
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] | 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] | ||
| + | |||
| + | ==Notes== | ||
| + | <references /> | ||
Revision as of 15:54, 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