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Acoustic instability in cosmic ray mediated shocks
Kang, Hyesung; Jones, T. W.; Ryu, Dongsu
AA(Minnesota, University, Minneapolis), AB(Minnesota, University, Minneapolis), AC(Princeton University Observatory, NJ)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 385, Jan. 20, 1992, p. 193-204. Research supported by University of Minnesota. (ApJ Homepage)
Publication Date:
Space Radiation
NASA/STI Keywords:
Cosmic Rays, Frequency Stability, Particle Acceleration, Shock Waves, Sound Waves, Incident Radiation, Interstellar Matter, Time Dependence
Bibliographic Code:


The acoustic instability in cosmic-ray-dominated media that can amplify sound waves shorter than the scale height of the cosmic-ray pressure is examined. The effects of the instability on the particle distribution are investigated using a time-dependent numerical method in which the diffusion-advection transport equation for the particle distribution function is solved self-consistently with the hydrodynamic conservation equations. Incident sound waves can grow into shocks in the precursors of strong cosmic-ray-mediated shocks, so that the gas entropy is increased significantly before shock passage, and the postshock cosmic ray pressure is slightly decreased. The possibility is suggested that the amplified small-scale density structures might produce ESE, a class of flux variation observed in some compact radio sources and thought to be caused by scattering or refraction in the intervening interstellar medium.

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