Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986azh....63..446k&link_type=abstract
(Astronomicheskii Zhurnal, vol. 63, May-June 1986, p. 446-457) Soviet Astronomy (ISSN 0038-5301), vol. 30, May-June 1986, p. 267
Astronomy and Astrophysics
Astronomy
1
Galactic Cosmic Rays, Interstellar Matter, Magnetohydrodynamic Stability, Plasma Dynamics, Radiation Effects, Density Distribution, Diffusion Coefficient, Energy Distribution, Stellar Gravitation
Scientific paper
The diffusion-convection formulation is used to study the influence of galactic cosmic rays on the stability and dynamics of the interstellar medium which is supposedly kept in equilibrium by the gravitational field of stars. It is shown that the influence of cosmic rays on the growth rate of MHD instability depends largely on a dimensionless parameter expressing the ratio of the characteristic acoustic time scale to the cosmic-ray diffusion time. If this parameter is small, the cosmic rays will decelerate the build-up of instabilities, thereby stabilizing the system; in contrast, if the parameter is large, the system will be destabilized.
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