Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...400..622b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 400, no. 2, p. 622-628.
Astronomy and Astrophysics
Astrophysics
1
Cosmic Rays, Elementary Particle Interactions, Magnetoacoustic Waves, Magnetohydrodynamic Waves, Particle Acceleration, Shock Wave Propagation, Viscosity
Scientific paper
The paper investigates the damping of MHD waves and longitudinal velocity gradients by the cosmic-ray (CR) anomalous viscosity. The damping rates of transverse waves, longitudinal magnetosonic waves, and longitudinal velocity gradients are calculated. These rates are applied to conditions near interstellar shock waves, where CR acceleration is assumed to be taking place, and to the general ISM. It is found that the streaming instability may not be able to compete with viscous damping above a few thousand GeV. The acoustic wave instability that is due to the CR pressure gradient near shocks is damped efficiently by this viscous damping, and hence the shock wave is stable as far as this instability is concerned. The viscous damping is applied to the ISM, and the same results are found for the streaming instability.
Boulares Ahmed
Morfill Gregor
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