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Fine structure and evershed motions in the sunspot penumbra

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Abstract

The observed inhomogeneity of the intensity and Evershed motions means any model of the penumbra must be essentially inhomogeneous. A simple model is put forward in which the interaction of convection rolls with an initially homogeneous magnetohydrostatic sunspot field causes a concentration of flux in the dark filaments. This process drives Evershed motions outwards in these regions; the motions are superficial and shear the lines of force, so that the field appears stronger and more horizontal in the dark filaments. This situation must be time-dependent to avoid rapid destruc tion of the whole spot.

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Authors and Affiliations

  1. Dept. of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge, England

    D. J. Galloway

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  1. D. J. Galloway
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Galloway, D.J. Fine structure and evershed motions in the sunspot penumbra. Sol Phys 44, 409–415 (1975). https://doi.org/10.1007/BF00153220

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