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Some Features of the Two Sunspot Group Populations’ Properties

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Abstract

This paper describes some features of the two sunspot group populations’ properties: Large Long-living Groups, LLG, and Small Short-living, SSG (each distributed lognormally), divided by the lifetime of the group (less and strictly more than 5 days). It is shown that the relative fraction of LLG varies with the latitude from 0.45 at mid-latitudes to 0.25–0.30 at low and high latitudes. The SSG has a wider spread in latitude than the LLG. It is shown that the N-S asymmetry is an overall global process to which both the LLG and the SSG are exposed. At the same time, the asymmetry of LLG shows a slightly higher dispersion of oscillations than the asymmetry of SSG. Other properties of sunspot groups in the context of the two separate populations existence are considered.

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ACKNOWLEDGMENTS

This work was supported in part by the Russian Foundation for Basic Research (grants 16-02-00090, 18-32-00555, 16-02-00749 ) and the program of the Presidium of the Russian Academy of Sciences no. 28.

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Authors and Affiliations

  1. Central Astronomical observatory of RAS at Pulkovo, St. Petersburg, Russia

    Yu. A. Nagovitsyn, A. A. Pevtsov, A. A. Osipova & V. G. Ivanov

  2. State University of Aerospace Instrumentation, St. Petersburg, Russia

    Yu. A. Nagovitsyn

  3. National Solar Observatory, CO 80303, Boulder, USA

    A. A. Pevtsov

Authors
  1. Yu. A. Nagovitsyn
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  2. A. A. Pevtsov
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  3. A. A. Osipova
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  4. V. G. Ivanov
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Correspondence to Yu. A. Nagovitsyn.

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Nagovitsyn, Y.A., Pevtsov, A.A., Osipova, A.A. et al. Some Features of the Two Sunspot Group Populations’ Properties. Geomagn. Aeron. 58, 1170–1174 (2018). https://doi.org/10.1134/S001679321808025X

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  • DOI: https://doi.org/10.1134/S001679321808025X

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