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Article Dans Une Revue Geophysical and Astrophysical Fluid Dynamics Année : 1999

Large-scale dynamo produced by negative magnetic eddy diffusivities

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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.
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hal-00546265 , version 1 (19-11-2020)

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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, 1999, 91, pp.131-146. ⟨10.1080/03091929908203701⟩. ⟨hal-00546265⟩
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