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M. L. Rogers, M. T. Richards (Penn State University)
We have analyzed archival data on sunspot numbers from 1749 - 2004 and sunspot areas from 1874 - 2004 to derive the solar activity cycles based on these variables. We used two independent techniques in this analysis. We have identified the well-known 11-year Schwabe cycle, the 22-year Hale cycle, the 80-90-year Gleissberg cycle, as well as a cycle at approximately 10 years.
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Bulletin of the American Astronomical Society, 36 #2
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