Distribution of active regions on the solar surface estimated by statistical methods |
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Authors: | N Ograpishvili |
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Institution: | 1. Abastumani Astrophysical Observatory, 380 060, Georgian AS, Tbilisi, Georgia
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Abstract: | 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: - 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.
- As regards the importances, the distribution of all ARs is lognormal.
- The distribution of ARs that emerged far from background field borders is not normal.
- ARs are not casual or rare events on the Sun.
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