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

R.D. Simitev, F.H. Busse

Research output: Contribution to journalArticle

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.
Original languageEnglish
Article number19001
JournalEurophysics Letters
Volume85
Issue number1
DOIs
Publication statusPublished - Jan 2009

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