Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992itps...20..909m&link_type=abstract
IEEE Transactions on Plasma Science (ISSN 0093-3813), vol. 20, no. 6, p. 909-916.
Astronomy and Astrophysics
Astronomy
1
Astronomical Spectroscopy, Galactic Cosmic Rays, Interstellar Matter, Particle Acceleration, Shock Wave Propagation, Supernova Remnants, Distribution Functions, Fermi Surfaces, Hydrodynamic Equations
Scientific paper
A hybrid simulation scheme is applied to treat first-order Fermi acceleration in the neighborhood of shock waves. A steady-state hydrodynamic approximation that describes the shock transition is used to evaluate the evolution in position, phase, and pitch angle of relativistic test particles. The relativistic test particles are followed to obtain the distribution function for a specific time after injection. Various physical parameters are analyzed as a function of time for different approximations to the diffusion coefficients and spectral indexes for the power-law MHD turbulent spectrum (normalized to the wave pressure obtained from the hydrodynamic approximation). Results are applied to a proposed scenario of the main global acceleration mechanism of galactic cosmic rays from a few GeV's to 100,000-1,000,000 GeV.
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