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Large-scale dynamo produced by negative magnetic eddy diffusivities

Alessandra Sabina Lanotte 1 Alain Noullez 2 Massimo Vergassola Achim Wirth 3
1 ISAC - CNR Institute of Atmospheric Sciences and Climate
2 CASSIOPEE - Laboratoire de Cosmologie, Astrophysique Stellaire & Solaire, de Planétologie et de Mécanique des Fluides
3 LEGI - Laboratoire des Écoulements Géophysiques et Industriels [Grenoble]
Abstract : The existence of incompressible flow producing negative magnetic eddy diffusivities is demonstrated. This provides for a dynamo mechanism, alternative to α-type effects, requiring neither the presence of mean heliciiy nor the breaking of parity invariance. In the kinematic dynamo phase, the magnetic field grows exponentially with a growth rate proportional to the square of the wavenumber. The concrete example, analyzed by means of multiscale techniques, is a parity-invariant flow of the Taylor-Green type.
Keywords : turbulent diffusion Stability Dynamo processes stability
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Journal articles
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Submitted on : Thursday, November 19, 2020 - 5:56:05 PM
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Alessandra Sabina Lanotte, Alain Noullez, Massimo Vergassola, Achim Wirth. Large-scale dynamo produced by negative magnetic eddy diffusivities. Geophysical and Astrophysical Fluid Dynamics, Taylor & Francis, 1999, 91, pp.131-146. ⟨10.1080/03091929908203701⟩. ⟨hal-00546265⟩

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