Hydromagnetic stability of the Kennedy-Higgins model of the earth's core

Details Hydromagnetic stability of the Kennedy-Higgins model of the earth's core Hydromagnetic stability of the Kennedy-Higgins model of the earth's core

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pepi...27....1e&link_type=abstract

Physics of the Earth and Planetary Interiors, vol. 27, Dec. 1981, p. P1-P5.

Physics

Geophysics

9

Earth Core, Geophysics, Magnetohydrodynamic Stability, Shell Stability, Spherical Shells, Convective Flow, Geomagnetism, Rotating Fluids, Viscous Fluids

Scientific paper

The linear stability of a spherical shell of an electrically and thermally conducting viscous fluid rotating uniformly in the presence of a co-rotating toroidal magnetic field is investigated for cases where the lower part of the fluid is top-heavy and the upper part is bottom-heavy. For small amplitudes of the magnetic field, instability occurs in a thin cylindrical cell whose generators are parallel to the rotation axis, and for moderate and large amplitudes, instability occurs in the whole volume of the fluid. In the unstably-stratified portion of the fluid, instability is buoyancy-driven while magnetic instability prevails in the stably stratified part of the fluid with stable stratification as an essential ingredient.

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