Total sunspot area as a solar activity index

Details Total sunspot area as a solar activity index Total sunspot area as a solar activity index

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sosyr..40..521s&link_type=abstract

Solar System Research, Volume 40, Issue 6, pp.521-526

Physics

96.60.Qd

Scientific paper

Observational time series of the total sunspot area A in the visible solar hemisphere are analyzed. A technique that allows the instability of the scale of these series to be found and corrected has been developed. An internally homogeneous series of the index A on the Greenwich scale can be obtained from 1875 to the present. A method for the approximate calculation of the yearly mean A from the Wolf sunspot numbers known since 1700 is suggested to extend this series into the past. The resulting series of the index A characterizes the solar activity variations over a period of ˜300 years. These data are used to study processes in the Solar System related to the variability of the central star.

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