A Landau fluid model for dispersive magnetohydrodynamics

  • T. Passot
    Observatoire de la Côte d’Azur, CNRS, Boı̂te Postale 4229, 06304 Nice, Cedex 4, France
  • P. L. Sulem
    Observatoire de la Côte d’Azur, CNRS, Boı̂te Postale 4229, 06304 Nice, Cedex 4, France

説明

<jats:p>A monofluid model with Landau damping is presented for strongly magnetized electron-proton collisionless plasmas whose distribution functions are close to bi-Maxwellians. This description that includes dynamical equations for the gyrotropic components of the pressure and heat flux tensors, extends the Landau-fluid model of Snyder, Hammett, and Dorland [Phys. Plasmas 4, 3974 (1997)] by retaining Hall effect and finite Larmor radius corrections. It accurately reproduces the weakly nonlinear dynamics of dispersive Alfvén waves whose wavelengths are large compared to the ion inertial length, whatever their direction of propagation, and also the rapid Landau dissipation of long magnetosonic waves in a warm plasma.</jats:p>

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