Computer Science
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jfm...196..323c&link_type=abstract
Journal of Fluid Mechanics (ISSN 0022-1120), vol. 196, Nov. 1988, p. 323-344.
Computer Science
67
Kelvin-Helmholtz Instability, Solar Atmosphere, Solar Magnetic Field, Sunspot Cycle, Dynamo Theory, Magnetic Induction, Magnetohydrodynamic Flow
Scientific paper
Motivated by considerations of the solar toroidal magnetic field, the behavior of a layer of uniform magnetic field embedded in a convectively stable atmosphere is studied. Since the field can support extra mass, such a configuration is top-heavy and thus instabilities of the Rayleigh-Taylor type can occur. For both static and rotating basic states, the evolution of the interchange modes (no bending of the field lines) is followed by integrating numerically the nonlinear compressible MHD equations. The initial Rayleigh-Taylor instability of the magnetic field gives rise to strong shearing motions, thereby exciting secondary Kelvin-Helmholtz instabilities which wrap the gas into regions of intense vorticity. The subsequent motions are determined primarily by the strong interactions between vortices which are responsible for the rapid disruption of the magnetic layer.
Cattaneo Fausto
Hughes David W. W.
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