The stability of cosmic-ray-dominated shocks - A secondary instability

Details The stability of cosmic-ray-dominated shocks - A secondary instability The stability of cosmic-ray-dominated shocks - A secondary instability

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...405..199r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 405, no. 1, p. 199-206.

Astronomy and Astrophysics

Astrophysics

16

Acoustic Instability, Cosmic Rays, Hydrodynamics, Shock Waves, Shock Wave Propagation, Two Dimensional Flow

Scientific paper

Previous studies in one spatial dimension showed that the precursors of cosmic-ray-dominated shocks are unstable against traveling acoustic disturbances. Here we report that a secondary, Rayleigh-Taylor type instability can exist in cosmic-ray-dominated media influenced by the acoustic instability. Using the local WKB approximation, the growth rate of the secondary instability is shown to be comparable to that of the one-dimensional acoustic instability itself in the cases we have considered. The nonlinear development has been followed numerically with a two-dimensional PPM hydrodynamics code that also incorporates the two-fluid cosmic-ray energy equation. We show that the secondary instability may cause the precursor and postshock flows to become highly turbulent.

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