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On the turbulent decay of strong magnetic fields and the development of sunspot areas

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Abstract

This paper deals with the conception that two-dimensional turbulence is present in a sunspot where the magnetic field is strong. This conception is based upon the incapacity of even a strong magnetic field to influence an arbitrary two-dimensional turbulence, if the magnetic field is parallel to a constant direction and the motion occurs in planes orthogonal to it. It is, moreover, shown that such a two-dimensional turbulence provides for a turbulent decay of the magnetic field. The decay rate possesses nearly the same dependence on the scales as for three-dimensional turbulence. Finally, the turbulent decay is studied by investigating a simple model and comparing the results with those deduced by Bumba from the observed decay of sunspot groups areas. By means of our conception even a good quantitative agreement is stated.

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Authors and Affiliations

  1. Zentralinstitut für Astrophysik der Akademie der Wissenschaften der D.D.R., Potsdam, D.D.R.

    F. Krause & G. Rüdiger

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  1. F. Krause
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  2. G. Rüdiger
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Krause, F., Rüdiger, G. On the turbulent decay of strong magnetic fields and the development of sunspot areas. Sol Phys 42, 107–119 (1975). https://doi.org/10.1007/BF00153288

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  • DOI: https://doi.org/10.1007/BF00153288

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