Articles | Volume 11, issue 5/6
Nonlin. Processes Geophys., 11, 609–618, 2004
https://doi.org/10.5194/npg-11-609-2004

Special issue: Advances in space environment turbulence

Nonlin. Processes Geophys., 11, 609–618, 2004
https://doi.org/10.5194/npg-11-609-2004

  30 Nov 2004

30 Nov 2004

Landau-fluid simulations of Alfvén-wave instabilities in a warm collisionless plasma

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

Abstract. A dispersive Landau-fluid model is used to study the decay and modulational instabilities of circularly-polarized Alfvén waves in a collisionless plasma, as well as their nonlinear developments. Comparisons are presented with the drift-kinetic approximation for the dispersionless regime and with hybrid simulations in more general conditions. The effect of the nature of the instability on particle heating is discussed, together with the formation of coherent structures or the development of an inverse cascade.