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The crossover effect in sunspots and the fine structure of penumbra

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Abstract

The peculiarities of magnetosensitive lines in the penumbral spectrum and the abnormal distribution of circular polarization in them are explained satisfactorily in terms of superposition of radiation originating in different elements of penumbral fine structure. Complicated asymmetric rv − contours can be represented as a sum of two components related to bright (BR) and dark (DR) penumbral regions. Crossover effect in sunspot penumbra appears, when there is considerable relative radial mass velocity in BR and DR, having the magnetic field of different polarities in them. Such conditions are supposed to exist in the penumbra of some sunspots, situated close to the solar limb.

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Authors and Affiliations

  1. Siberian Institute of Terrestrial Magnetism, Ionosphere and Radiowave Propagation, Irkutsk, U.S.S.R.

    A. A. Golovko

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  1. A. A. Golovko
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Golovko, A.A. The crossover effect in sunspots and the fine structure of penumbra. Sol Phys 37, 113–125 (1974). https://doi.org/10.1007/BF00157848

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  • DOI: https://doi.org/10.1007/BF00157848

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