Diffusive cosmic-ray acceleration - Two-fluid models with in situ injection

Details Diffusive cosmic-ray acceleration - Two-fluid models with in situ injection Diffusive cosmic-ray acceleration - Two-fluid models with in situ injection

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...353..149k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 353, April 10, 1990, p. 149-158. Research supported by the Minnesota Superc

Statistics

Computation

40

Computational Astrophysics, Cosmic Rays, Diffuse Radiation, Particle Acceleration, Two Fluid Models, Astronomical Models, Distribution Functions, Radiation Pressure, Shock Waves

Scientific paper

An enhanced formulation of the two-fluid model for diffusive acceleration at shocks is presented which explicitly includes in situ injection of cosmic rays within the shock and allows the slope of the cosmic-ray momentum distribution to change across the shock. In addition, it is argued that the two-fluid model has applications even when the energy-weighted mean slope of the particle distribution function q is less than or equal to 4/3 or greater than or equal to 5/3, in contrast to the conclusion of Achterberg et al. (1984). The enhanced formulation is used to compare in steady-state shocks the efficiencies of acceleration in shocks with and without in situ injection. The present two-fluid model gives results consistent with more complete simulations.

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