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Energy decay laws in strongly anisotropic magnetohydrodynamic turbulence

TitreEnergy decay laws in strongly anisotropic magnetohydrodynamic turbulence
Type de publicationJournal Article
Year of Publication2008
AuteursBigot, B, Galtier, S, Politano, H
JournalPhysical Review Letters
Volume100
Date PublishedFeb
ISBN Number0031-9007
Numéro d'accèsWOS:000253336900033
Résumé

We investigate the influence of a uniform magnetic field B(0)=B(0)e(parallel to) on energy decay laws in incompressible magnetohydrodynamic (MHD) turbulence. The nonlinear transfer reduction along B(0) is included in a model that distinguishes parallel and perpendicular directions, following a phenomenology of Kraichnan. We predict a slowing down of the energy decay due to anisotropy in the limit of strong B(0), with distinct power laws for energy decay of shear- and pseudo-Alfven waves. Numerical results from the kinetic equations of Alfven wave turbulence recover these predictions, and MHD numerical results clearly tend to follow them in the lowest perpendicular planes.

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