Ion injection and acceleration at modified shocks

Details Ion injection and acceleration at modified shocks Ion injection and acceleration at modified shocks

1999-06-07

arxiv.org/abs/astro-ph/9906114v1

Astronomy and Astrophysics

Astrophysics

4 pages, to be published in the Proceedings of the 26th ICRC, Salt Lake City, 1999, OG 3.3.20

Scientific paper

The theory of diffusive particle acceleration explains the spectral properties of the cosmic rays below energies of approx. 10^6 GeV as produced at strong shocks in supernova remnants (SNR's). To supply the observed flux of cosmic rays, a significant fraction of the energy released by a supernova has to be transfered to cosmic rays. The key to the question of the efficiency of SNR's in producing cosmic rays is the injection process from thermal energies. A self-consistent model has to take into account the interaction of the accelerated particles with magneto-hydrodynamic waves, which generate the particle diffusion, a requisite for the acceleration process. Such a nonlinear model of the turbulent background plasma has been developed recently (Malkov, 1998, Phys. Rev. E 58, 4911). We use this model for the first numerical treatment of the gas dynamics and the diffusion-convection equation at a quasi-parallel strong shock, which incorporates a plasma-physical injection model to investigate the cosmic ray production.

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