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The Dynamo Bifurcation in Rotating Spherical Shells

Abstract : We investigate the nature of the dynamo bifurcation in a configuration applicable to the Earth's liquid outer core, i.e. in a rotating spherical shell with thermally driven motions. We show that the nature of the bifurcation, which can be either supercritical or subcritical or even take the form of isola (or detached lobes) strongly depends on the parameters. This dependence is described in a range of parameters numerically accessible (which unfortunately remains remote from geophysical application), and we show how the magnetic Prandtl number and the Ekman number control these transitions.
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Submitted on : Thursday, March 10, 2022 - 4:43:28 PM
Last modification on : Saturday, March 12, 2022 - 3:32:33 AM

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Vincent Morin, Emmanuel Dormy. The Dynamo Bifurcation in Rotating Spherical Shells. International Journal of Modern Physics B, 2009, 23, pp.5467-5482. ⟨10.1142/S021797920906378X⟩. ⟨insu-03604917⟩

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