On the effect of differential rotation on axisymmetric and nonaxisymmetric magnetic fields of cosmic bodies

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Axes Of Rotation, Magnetic Field Configurations, Planetary Magnetic Fields, Stellar Magnetic Fields, Axisymmetric Flow, Dynamo Theory, Magnetic Stars

Scientific paper

The behaviour of magnetic fields penetrating an electrically conducting fluid body with differential rotation depends crucially on their symmetry about the axis of rotation. In the non-axisymmetric case differential rotation enhances dissipation. It symmetrizes the fields during their evolution and is able to screen off their non-axisymmetric constituents. The αω-mechanism, unlike the α2-mechanism, can work with axisymmetric fields only. Those facts imply that cosmical bodies showing strongly non-axisymmetric fields should not have strong differential rotation. Consequences concerning planets, Sun, and magnetic stars are indicated.

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