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Magnetic reversals in a simple model of MHD

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arxiv 0906.0427 v1 pith:2J2MOVPL submitted 2009-06-02 astro-ph.EP astro-ph.SRcond-mat.othernlin.CDphysics.plasm-ph

Magnetic reversals in a simple model of MHD

Roberto Benzi , Jean-Francois Pinton This is my paper
classification astro-ph.EP astro-ph.SRcond-mat.othernlin.CDphysics.plasm-ph
keywords fieldmagnetichydrodynamicsmodelreversalssimpleturbulenceapproach
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We study a simple magnetohydrodynamical approach in which hydrodynamics and MHD turbulence are coupled in a shell model, with given dynamo constrains in the large scales. We consider the case of a low Prandtl number fluid for which the inertial range of the velocity field is much wider than that of the magnetic field. Random reversals of the magnetic field are observed and it shown that the magnetic field has a non trivial evolution linked to the nature of the hydrodynamics turbulence.

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