Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...269..518l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 269, no. 1-2, p. 518-526.
Astronomy and Astrophysics
Astronomy
10
Electric Current, Photosphere, Solar Atmosphere, Solar Magnetic Field, Magnetic Flux, Solar Convection (Astronomy)
Scientific paper
In order to explain recent high-resolution magnetogram and filtergram observations, we propose a self-excited dynamo model for the magnetic elements, or network patches, that occur in the high photosphere of the sun at the periphery of supergranules. We assume that an element is a magnetic flux tube that stands more or less vertically and that results from the presence of azimuthal electric currents, and we describe a mechanism that could generate these currents. As a first approximation, we assume that the electric current density is uniform. This model accounts for the existence of magnetic elements, for their stability, for the existence of neighboring fields of opposite polarity, and for their mutual attraction and repulsion. The power dissipation associated with the azimuthal currents accounts for only a small part of the observed radiation in the low photosphere, so that other explanations for the brilliance will have to be considered. We also propose a more realistic but more elaborate model in which the azimuthal electric current distribution is not uniform.
Koutchmy Serge
Lorrain Paul
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