Thermal and magnetically driven instabilities in a non-constantly stratified rapidly rotating fluid layer with azimuthal magnetic field.

Physics – Fluid Dynamics

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Dynamo Theory: Earth Core

Scientific paper

The linear hydromagnetic stability problem for a horizontal non-constantly stratified fluid layer rapidly rotating about the z-axis and permeated by an azimuthal non-homogeneous magnetic field is investigated. A non-linear (parabolic) temperature profile is used to simulate the lower part of the fluid core being unstably stratified and the upper part stably stratified. The problem is solved on the magnetic diffusion timescale and for q < 1 (q is the ratio of the thermal and magnetic diffusivities). The model is investigated for various widths of the stably stratified part of the layer and for a wide range of values of the azimuthal magnetic strength.

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