Solar System Research

, Volume 40, Issue 6, pp 521–526 | Cite as

Total sunspot area as a solar activity index

  • A. P. Sarychev
  • E. M. Roshchina


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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Copyright information

© Pleiades Publishing, Inc. 2006

Authors and Affiliations

  • A. P. Sarychev
    • 1
  • E. M. Roshchina
    • 1
  1. 1.Sternberg Astronomical InstituteMoscowRussia

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