Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...326..395p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 326, March 1, 1988, p. 395-406.
Astronomy and Astrophysics
Astrophysics
6
Magnetic Stars, Magnetohydrodynamics, Stellar Interiors, Stellar Magnetic Fields, Stellar Models, Convection, Dynamic Stability, Dynamo Theory, Meridional Flow, Stellar Oscillations, Sun
Scientific paper
Simple analysis of the hydrodynamics initiated by the presence of a coherent flux bundle in the lower half of the convective zone of a star like the Sun indicates that bundles with diameters comparable to the local pressure scale height (˜5 x 109 cm) are subject to sidewise motions perhaps as fast as 103 cms-1. The motions arise as a consequence of the bundle being squeezed between the cool shadow above and the accumulating heat below, and because of convective propulsion. This suggests that the equatorward motion (102 cm s-1) of the azimuthal fields, inferred from observations of the Sun, may be as much a consequence of the hydrodynamics of flux bundles and meridional circulation as it is of the dynamo effects that create the flux.
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