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Large-scale dynamo produced by negative magnetic eddy diffusivities

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.
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https://hal.archives-ouvertes.fr/hal-00546265
Contributor : Achim Wirth Connect in order to contact the contributor
Submitted on : Thursday, November 19, 2020 - 5:56:05 PM
Last modification on : Tuesday, December 7, 2021 - 4:10:07 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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