Periodogram Analysis of Sunspot Numbers and Areas

Details Periodogram Analysis of Sunspot Numbers and Areas Periodogram Analysis of Sunspot Numbers and Areas

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...204.0221r&link_type=abstract

American Astronomical Society Meeting 204, #02.21; Bulletin of the American Astronomical Society, Vol. 36, p.670

Astronomy and Astrophysics

Astronomy

1

Scientific paper

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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