Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29t..58v&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 20, pp. 58-1, CiteID 1997, DOI 10.1029/2002GL014782
Astronomy and Astrophysics
Astrophysics
7
Solar Physics, Astrophysics, And Astronomy: General Or Miscellaneous, And Astronomy: Solar Activity Cycle (2162), History Of Geophysics: Solar/Planetary Relationships, And Astronomy: Solar And Stellar Variability, Global Change: Solar Variability
Scientific paper
The state of the sun strongly affects terrestrial phenomena. While the eleven-year solar cycle was recognized in the XIX century, the lack of direct data concerning our star in historical times has made it difficult to determine the characteristics of solar variability on a secular scale. We here construct a series of yearly sunspot numbers as observed by eye in remote times and recorded in historical documents covering the period 165 BC-1918 AD. Using different spectral analysis methods, we find a 250-year cycle which appears to have a solar origin.
Gallego M. C.
García Alejandro J.
Vaquero José M.
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