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

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