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Note on the characteristics of sunspot groups which produce solar proton flares

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Abstract

Solar proton flares are associated with sunspot groups which show an unusual distribution of magnetic polarities. Furthermore, the gradient of the magnetic field is very large before the onset of these flares. The importance of polar cap absorptions, which is proportional to the integral flux of solar cosmic rays, tends to increase as the gradient of the magnetic field becomes greater. It is shown that the formation of such gradients is associated with the rotating motion of sunspot groups. Hence, the sunspot groups which show a reversed polarity distribution are very effective for the production of solar proton flares.

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Authors and Affiliations

  1. Radio Astronomy Branch, Laboratory for Extraterrestrial Physics, NASA, Goddard Space Flight Center, Greenbelt, Md, U.S.A.

    Kunitomo Sakurai

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  1. Kunitomo Sakurai
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NASA Associate with University of Maryland.

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Sakurai, K. Note on the characteristics of sunspot groups which produce solar proton flares. Sol Phys 23, 142–145 (1972). https://doi.org/10.1007/BF00153897

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  • DOI: https://doi.org/10.1007/BF00153897

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