Turbulent 3D MHD dynamo model in spherical shells: Regular oscillations of the dipolar field

preprint2011arXivOpen access

Abstract

We report the results of three-dimensional numerical simulations of convection-driven dynamos in relatively thin rotating spherical shells that show a transition from an strong non-oscillatory dipolar magnetic field to a weaker regularly oscillating dipolar field. The transition is induced primarily by the effects a stress-free boundary condition. The variation of the inner to outer radius ratio is found to have a less important effect.

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