Diffusive Shock Acceleration with Self-Consistent Injection

Details Diffusive Shock Acceleration with Self-Consistent Injection Diffusive Shock Acceleration with Self-Consistent Injection

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jkas...34..293k&link_type=abstract

Journal of the Korean Astronomical Society, vol. 34, no. 4, pp. 293-295

Astronomy and Astrophysics

Astronomy

1

Acceleration Of Particles, Cosmic Rays, Hydrodynamics, Methods: Numerical

Scientific paper

A numerical scheme that incorporates a self-consistent cosmic-ray (CR, hereafter) injection model into the combined gas dynamics and CR diffusion-convection code has been developed. The hydro/CR code can follow in a very cos-effective way the evolution of CR modified shocks by adopting subzone shock-tracking and multi-level Adaptive Mesh Refinement techniques. The injection model is based on interactions of the suprathermal particles with self-generated MHD waves in quasi-parallel shocks. The particle injection is followed numerically by filtering the diffusive flux of suprathermal particles across the shock to upstream region according to a velocity- dependent transparency function, which represents the fraction of leaking suprathermal particles. In the strong shock limit of Mach numbers >= 20, significant physical processes such as the injection and acceleration seem to become independent of M, while they are sensitively dependent on M for M < 10. Although some particles injected early in the evolution continue to be accelerated to higher energies, the postshock CR pressure reaches a time asymptotic value due to balance between acceleration and diffusion of the CR particles.

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