Solar Physics

, Volume 149, Issue 1, pp 93–104 | Cite as

Distribution of active regions on the solar surface estimated by statistical methods

  • N. Ograpishvili


Statistical properties of solar active regions (AR) have been studied. In particular, (1) the distribution of ARs by their areas and importances using normal and lognormal distribution laws; (2) it was checked whether the distribution of the ARs' birth sites satisfies the Poisson distribution law (the so-called ‘law of rare events’).

Observational data of 1979–1982 have been used and our conclusions are as follows:
  1. (1)

    As regards the areas, the distribution of the ARs that emerged near or on the borders of the large-scale background fields is normal or lognormal.

  2. (2)

    As regards the importances, the distribution of all ARs is lognormal.

  3. (3)

    The distribution of ARs that emerged far from background field borders is not normal.

  4. (4)

    ARs are not casual or rare events on the Sun.



Statistical Method Active Region Observational Data Poisson Distribution Lognormal Distribution 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Babcock, H. W.: 1961,Astrophys. J. 133, 572.Google Scholar
  2. Bol'shev, L. N. and Smirnov, N. V.: 1963,Tables of Mathematical Statistics, Nauka, Moscow.Google Scholar
  3. Brailovskaya, I. Yu., Koval', A. N., Ogir', M. B., and Stepanyan, N. N.: 1972,Soln. Dann. No. 6, 88.Google Scholar
  4. Bumba, V. and Obridko, V. N.: 1961,Solar Phys. 6, 104.Google Scholar
  5. Hoodson, D.: 1970,Statistics for Physicists, MIR, Moscow, p. 74.Google Scholar
  6. Marish, D.: 1971,Soln. Dann. No. 8, 86.Google Scholar
  7. Martres, M. J.: 1968, in K. O. Kiepenheuer (ed.), ‘Structure and Development of Solar Active Regions’,IAU Symp. 35, 25.Google Scholar
  8. Ograpishvili, N. B.: 1988,Solar Phys. 115, 33.Google Scholar
  9. Pustyl'nik, E. I.: 1968,Statistical Methods and Treatment of Observations, Nauka, Moscow, p. 67.Google Scholar
  10. Severny, A. B.: 1969,Nature 224, No. 5214, 53.Google Scholar
  11. Severny, A. B.: 1971,Quart. J. Astron. Soc. 12, 363.Google Scholar
  12. Solar Geophysical Data, 1979–1982.Google Scholar
  13. Stepanyan, N. N.: 1983,Publ. Debrecen Heliophys. Obs. 5, 225.Google Scholar
  14. Vitinsky, Yu. I.: 1960,Izv. Krymsk. Astrofiz. Obs. 163, 96.Google Scholar
  15. Vitinsky, Yu. I.: 1969,Solar Phys. 7, 210.Google Scholar
  16. Vitinsky, Yu. I.: 1971,Izv. Krymsk. Astrofiz. Obs. 189, 10.Google Scholar

Copyright information

© Kluwer Academic Publishers 1994

Authors and Affiliations

  • N. Ograpishvili
    • 1
  1. 1.Abastumani Astrophysical ObservatoryGeorgian AS, TbilisiGeorgia

Personalised recommendations