Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...693..281f&link_type=abstract
The Astrophysical Journal, Volume 693, Issue 1, pp. 281-284 (2009).
Astronomy and Astrophysics
Astronomy
6
Mhd, Plasmas, Shock Waves, Waves
Scientific paper
With the observations made at the more recent crossings of the Voyager space probes over the solar wind termination shock, up-to-date knowledge of the physics at astrophysical shocks has been deeply challenged in many respects. In this paper, we mainly address the associated facts that the ion plasma downstream of the shock appears to be supercritically anisotropic and induces magnetohydrodynamic (MHD) turbulence triggered by downstream instabilities. We present a theoretical study of this phenomenon starting from Rankine-Hugoniot-type MHD shock relations generalized by momentum and energy flows of self-induced turbulence. These relations can be solved for quasi-perpendicular shock configurations for subcritical compressions when no turbulence is triggered. We derive the value for the critical compression ratio and discuss the physical features of subcritical shocks as a function of the upstream plasma conditions. We also pave the way to supercritical shocks with a more complicated treatment.
Fahr Hans Jörg
Siewert Mark
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