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Article Dans Une Revue Physical Review Letters Année : 2008

Bypassing Cowling's Theorem in Axisymmetric Fluid Dynamos

Résumé

We present a numerical study of the magnetic field generated by an axisymmetrically forced flow in a spherical domain. We show that, even in the absence of nonaxisymmetric velocity fluctuations, a mean magnetic field with a dominant axisymmetric dipolar component can be generated via a secondary bifurcation from an equatorial dipole. We understand the dynamical behaviors that result from the interaction of equatorial and axial dipolar modes using simple model equations for their amplitudes derived from symmetry arguments.
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hal-03742767 , version 1 (20-08-2023)

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Christophe Gissinger, Emmanuel Dormy, Stéphan Fauve. Bypassing Cowling's Theorem in Axisymmetric Fluid Dynamos. Physical Review Letters, 2008, 101, pp.144502. ⟨10.1103/PhysRevLett.101.144502⟩. ⟨hal-03742767⟩
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