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

Simitev, R. and Busse, F.H. (2009) Bistability and hysteresis of dipolar dynamos generated by turbulent convection in rotating spherical shells. Europhysics Letters, 85(1), p. 19001. (doi:10.1209/0295-5075/85/19001)

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Publisher's URL: http://dx.doi.org/10.1209/0295-5075/85/19001

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.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Simitev, Dr Radostin
Authors: Simitev, R., and Busse, F.H.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Mathematics and Statistics > Mathematics
Journal Name:Europhysics Letters
Publisher:EDP Sciences
ISSN:0295-5075
ISSN (Online):1286-4854
Copyright Holders:Copyright © 2009 EDP Sciences
First Published:First published in Europhysics Letters 85:19001
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher.

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