Flows along magnetic flux tubes. I - Equilibrium and buoyancy of a slender magnetic loop in the interior of a star

Details Flows along magnetic flux tubes. I - Equilibrium and buoyancy of a slender magnetic loop in the interior of a star Flows along magnetic flux tubes. I - Equilibrium and buoyancy of a slender magnetic loop in the interior of a star

Sep 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....89...26s&link_type=abstract

Astronomy and Astrophysics, vol. 89, no. 1-2, Sept. 1980, p. 26-32.

Astronomy and Astrophysics

Astrophysics

15

Buoyancy, Coronal Loops, Magnetohydrodynamic Stability, Plasma Equilibrium, Solar Magnetic Field, Solar Wind, Stellar Interiors, Stellar Magnetic Fields, Solar Activity Effects, Stellar Envelopes, Stellar Structure

Scientific paper

It has been speculated that loop formation may enhance the buoyant loss of magnetic flux from stellar interiors. In this paper, the effect on magnetic buoyancy of a downflow along the arms of a slender, isolated magnetic loop formed from an initially horizontal flux tube is investigated excluding the uppermost subsurface layers of the star. Loop formation, in these circumstances, is shown to be incapable of accelerating the buoyant loss of magnetic flux from regions in radiative equilibrium. For convective regions as the envelope of the sun, only very broad loops with a radius of curvature of the order of their distance to the stellar center may grow and do not enhance the buoyant loss significantly. Thus horizontal (or azimuthal) flux tubes built by differential rotation stay horizontal for most of their buoyant rise through the star.

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