Volume 85, Number 1, January 2009
|Number of page(s)||5|
|Section||Geophysics, Astronomy and Astrophysics|
|Published online||16 January 2009|
Bistability and hysteresis of dipolar dynamos generated by turbulent convection in rotating spherical shells
Department of Mathematics, University of Glasgow - Glasgow G12 8QW, UK, EU
2 Institute of Physics, University of Bayreuth - Bayreuth D-95440, Germany, EU
Corresponding author: email@example.com
Accepted: 28 November 2008
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.
PACS: 91.25.Cw – Origins and models of the magnetic field; dynamo theories / 92.60.hk – Convection, turbulence, and diffusion / 47.20.Ky – Nonlinearity, bifurcation, and symmetry breaking
© EPLA, 2009
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