Long-Alfvén-wave trains in collisionless plasmas. I. Kinetic theory

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

説明

<jats:p>A generalized kinetic derivative nonlinear Schrödinger equation for the multidimensional dynamics of Alfvén wave trains propagating along an ambient magnetic field is derived from the Vlasov–Maxwell equations by a reductive perturbative expansion. It retains in addition to the Landau damping, the coupling to longitudinally averaged fields driven by both transverse gradients and kinetic effects. These mean fields that modulate the propagation speed of the wave play a main role in transverse instabilities of extended Alfvén wave packets and in the filamentation phenomenon. This long-wave model also provides a benchmark for Landau-fluid descriptions of collisionless plasmas.</jats:p>

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