Computer Science – Sound
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...385..193k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 385, Jan. 20, 1992, p. 193-204. Research supported by University of Minneso
Computer Science
Sound
45
Cosmic Rays, Frequency Stability, Particle Acceleration, Shock Waves, Sound Waves, Incident Radiation, Interstellar Matter, Time Dependence
Scientific paper
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.
Jones Thomas W.
Kang Hyesung
Ryu Dongsu
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