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Spontaneous Chiral Symmetry Breaking of Hall Magnetohydrodynamic Turbulence

TitreSpontaneous Chiral Symmetry Breaking of Hall Magnetohydrodynamic Turbulence
Type de publicationJournal Article
Year of Publication2012
AuteursMeyrand, R, Galtier, S
JournalPhysical Review Letters
Date PublishedNov
ISBN Number0031-9007
Numéro d'accèsWOS:000310852000009

Hall magnetohydrodynamics (MHD) is investigated through three-dimensional direct numerical simulations. We show that the Hall effect induces a spontaneous chiral symmetry breaking of the turbulent dynamics. The normalized magnetic polarization is introduced to separate the right-(R) and lefthanded (L) fluctuations. A classical k(-7/3) spectrum is found at small scales for R magnetic fluctuations which corresponds to the electron MHD prediction. A spectrum compatible with k(-11/3) is obtained at large-scales for the L magnetic fluctuations; we call this regime the ion MHD. These results are explained heuristically by rewriting the Hall MHD equations in a succinct vortex dynamical form. Applications to solar wind turbulence are discussed.

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