Cosmic rays at fluid discontinuities

Details Cosmic rays at fluid discontinuities Cosmic rays at fluid discontinuities

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...345l..67j&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 345, Oct. 1, 1989, p. L67-L69.

Statistics

Computation

17

Computational Astrophysics, Cosmic Rays, Shock Discontinuity, Boltzmann Transport Equation, Charged Particles, Monte Carlo Method, Scattering, Shock Waves

Scientific paper

Cosmic-ray transport near discontinuities in the background fluid velocity is considered. Matching conditions for the cosmic-ray distribution are derived for both shear and compressive (shock) discontinuities, keeping terms to second order in the ratio of fluid speed to energetic-particle speed. Acceleration is found at shear discontinuities, which is not present in the first-order theory, and a modification of the matching condition at shocks. If there is no particle source concentrated at a shock, the new condition reduces to that obtained from first-order theory. Monte Carlo simulations show good agreement with the theory.

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