Particle injection and the structure of energetic-particle-modified shocks

Details Particle injection and the structure of energetic-particle-modified shocks Particle injection and the structure of energetic-particle-modified shocks

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...406...67z&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 406, no. 1, p. 67-91.

Astronomy and Astrophysics

Astrophysics

68

Cosmic Rays, Energetic Particles, Shock Wave Propagation, Thermal Plasmas, Two Fluid Models, Particle Acceleration, Self Consistent Fields

Scientific paper

A macroscopic 'self-consistent' nonlinear two-fluid model is developed for energetic-particle-modeled shocks. The model incorporates particle exchange between a thermal gas and an energetic population via a 'thermal leakage' mechanism. In the model, injection is regarded as a process whereby particles in the cooler thermal core of a total particle distribution are energized sufficiently to cross a 'momentum boundary' into the wings of the distribution. Particles in the wings are identified as 'energetic particles' or 'cosmic rays' and are assumed to propagate according to the diffusive transport equation of cosmic ray theory. Thermal particles are energized either as a result of adiabatic compression in a decelerating flow or directly via anomalous heating within a subshock. It is shown that the nature and model of particle injection directly affects the nature and dynamics of the shock, and hence the efficiency of particle acceleration, and that the shock itself regulates particle injection dynamically.

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