Articles | Volume 12, issue 2
Nonlin. Processes Geophys., 12, 291–298, 2005
https://doi.org/10.5194/npg-12-291-2005
Nonlin. Processes Geophys., 12, 291–298, 2005
https://doi.org/10.5194/npg-12-291-2005

  11 Feb 2005

11 Feb 2005

Kinetic slow mode-type solitons

K. Baumgärtel1, K. Sauer2, and E. Dubinin2 K. Baumgärtel et al.
  • 1Astrophysikalisches Institut Potsdam, Germany
  • 2Max-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, Germany

Abstract. One-dimensional hybrid code simulations are presented, carried out in order both to study solitary waves of the slow mode branch in an isotropic, collisionless, medium-β plasma (βi=0.25) and to test the fluid based soliton interpretation of Cluster observed strong magnetic depressions (Stasiewicz et al., 2003; Stasiewicz, 2004) against kinetic theory. In the simulations, a variety of strongly oblique, large amplitude, solitons are seen, including solitons with Alfvenic polarization, similar to those predicted by the Hall-MHD theory, and robust, almost non-propagating, solitary structures of slow magnetosonic type with strong magnetic field depressions and perpendicular ion heating, which have no counterpart in fluid theory. The results support the soliton-based interpretation of the Cluster observations, but reveal substantial deficiencies of Hall-MHD theory in describing slow mode-type solitons in a plasma of moderate beta.