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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
Article

Abstract

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.

PACS numbers

96.60.qd 

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References

  1. Covington, A.E., Solar Radio Emission at 10.7 cm, 1947–1968, J. R. Astron. Soc. Can., 1969, vol. 63, pp. 125–132.ADSGoogle Scholar
  2. Covington, A.E. and Medd, W.J., Variations of the Daily Level of the 10.7 Centimetre Solar Emission, J. R. Astron. Soc. Can., 1954, vol. 48, pp. 136–149.ADSGoogle Scholar
  3. Fröhlich, C., Solar Irradiance Variations, Proc. ISCS Symp., Tatranská Lomnica, Slovakia, 2003, ESA-SP, 2003, vol. 535, pp. 183–193.Google Scholar
  4. Hathaway, D.H., Wilson, R.M., and Reichmann, E.J., Group Sunspot Numbers: Sunspot Cycle Characteristics, Sol. Phys., 2002, vol. 211, pp. 357–370.CrossRefADSGoogle Scholar
  5. Hoyt, D.V. and Schatten, K.H., Group Sunspot Numbers: a New Solar Activity Reconstruction, Sol. Phys., 1998, vol. 181, pp. 491–512.CrossRefADSGoogle Scholar
  6. Kononovich, E.V., Shefov, N.N., and Khramova, M.N., Approximation of Relationships Between Solar Activity Indices: Sunspot Wolf Numbers and Radio Emission Flux at a 10.7-cm Wavelength, Geomagn. Aeron., 2002, vol. 42, no. 4, pp. 453–454 [Geomagn. Aeron. (Engl. Transl.), vol. 42, no. 4, pp. 430–431].Google Scholar
  7. Kuklin, G.V., On Relation Between Wolf Numbers and Radio Emission Flux at 2800 MHz Frequency, Soln. Dannye, 1984, no. 1, pp. 87–95.Google Scholar
  8. Nagovitsyn, Yu.A., A Version of the Series of Annual Mean Total Spot Areas in the Northern and Southern Hemispheres in 1823–1874, Soln. Dannye, 1989, no. 8, pp. 86–91.Google Scholar
  9. Nagovitsyn, Yu.A., A Series of the Index of Total Solar Spot Area in the Greenwich System in 1821–1989, Soln. Dannye. Stat’i Soobshch. 1996–1995, 1996, pp. 38–48.Google Scholar
  10. Steinegger, M., Vazquez, M., Bonet, J.A., and Brandt, P.N., On the Energy Balance of Solar Active Regions, Astrophys. J., 1996, vol. 461, pp. 478–498.CrossRefADSGoogle Scholar
  11. Tapping, K.F., Recent Solar Radio Astronomy at Centimeter Wavelengths: the Temporal Variability of the 10.7-cm Flux, J. Geophys. Res., Ser. H, 1987, vol. 92, pp. 829–838.ADSCrossRefGoogle Scholar
  12. Usoskin, I.G. and Mursula, K., Long-Term Solar Cycle Evolution: Review of Recent Developments, Sol. Phys., 2003, vol. 218, pp. 319–343.CrossRefADSGoogle Scholar
  13. Usoskin, I.G., Mursula, K., and Kovaltsov, G.A., Reconstruction of Monthly and Yearly Group Sunspot Numbers from Sparse Daily Observations, Sol. Phys., 2003, vol. 218, pp. 295–305.CrossRefADSGoogle Scholar
  14. Vaquero, J.M., Gallego, M.C., and Sánchez-Bajo, F., Reconstruction of a Monthly Homogeneous Sunspot Area Series Since 1832, Sol. Phys., 2004, vol. 221, pp. 179–189.CrossRefADSGoogle Scholar
  15. Vitinskii, Yu.I., On Variations in the Characteristics of Correlation between Relative Numbers and Total Area of Sun Spots and the Phase of an 11-Year Solar Activity Cycle, Soln. Dannye, 1980, no. 9, pp. 102–106.Google Scholar
  16. Vitinskii, Yu.I., Kopetskii, M., and Kuklin, G.V., Statistika pyatnoobrazovatel’noi deyatel’nosti Solntsa (Statistics of Spot Forming Activity on the Sun), Moscow: Nauka, 1986.Google Scholar
  17. Waldmeier, M., Ergebnisse Und Probleme Der Sonnenforschung, Leipzig, 1955.Google Scholar

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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