EDP Sciences
Free access
Volume 501, Number 2, July II 2009
Page(s) 407 - 410
Section Astrophysical processes
DOI http://dx.doi.org/10.1051/0004-6361/200811164
Published online 05 May 2009
A&A 501, 407-410 (2009)
DOI: 10.1051/0004-6361/200811164

Modified jump conditions for anisotropic temperature plasmas at parallel shocks

M. Siewert and H.-J. Fahr

Argelander Institut für Astronomie der Universität Bonn, Abteilung für Astrophysik und Extraterrestrische Forschung, Auf dem Huegel 71, 53121 Bonn, Germany
    e-mail: msiewert@astro.uni-bonn.de

Received 16 October 2008 / Accepted 27 March 2009

Aims. We reinvestigate the parallel pressure-anisotropic MHD shock with an emphasis on the downstream stability of the plasma with respect to the firehose instability.
Methods. Aiming to close the underdetermined jump conditions, we take advantage of a kinetic model of the shock transit, based on the Boltzman-Vlasow equation with CGL invariants. In addition, we show that we need to consider plasma waves as an additional component of the system.
Results. The system of jump conditions and the kinetic model reduces to a relatively simple form. At first glance, about all parallel magnetosonic shocks must be considerd unstable, at least with respect to plasma-wave generation caused by the firehose instability. In a similar way to this fundamental instability, the system will be also unstable when considering other plasma instabilities.

Key words: plasmas -- shock waves -- magnetohydrodynamics (MHD) -- solar wind

© ESO 2009