Bistability and hysteresis of dipolar dynamos generated by turbulent convection in rotating spherical shells

Abstract

Bistability and hysteresis of magnetohydrodynamic dipolar dynamos generated by turbulent convection in rotating spherical fluid shells is demonstrated. Hysteresis appears as a transition between two distinct regimes of dipolar dynamos with rather different properties including a pronounced difference in the amplitude of the axisymmetric poloidal field component and in the form of the differential rotation. The bistability occurs from the onset of dynamo action up to about 9 times the critical value of the Rayleigh number for onset of convection and over a wide range of values of the ordinary and the magnetic Prandtl numbers including the value unity.

References in corpus (3)

• Prandtl number dependence of convection driven dynamos in rotating spherical fluid shells
• Parameter dependences of convection driven dynamos in rotating spherical fluid shells
• Subcritical dynamo bifurcation in the Taylor Green flow

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