Cosmic ray moderation of the thermal instability

Details Cosmic ray moderation of the thermal instability Cosmic ray moderation of the thermal instability

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...430..567w&link_type=abstract

Astronomy and Astrophysics, v.430, p.567-569 (2005)

Astronomy and Astrophysics

Astrophysics

7

Ism: Kinematics And Dynamics, Ism: Cosmic Rays, Hydrodynamics, Instabilities

Scientific paper

We apply the Hermite-Bieler theorem in the analysis of the effect of cosmic rays on the thermal stability of an initially uniform, static background. The cosmic rays were treated in a fluid approximation and the diffusion coefficient was assumed to be constant in time and space. The inclusion of cosmic rays does not alter the criterion for the thermal stability of a medium subjected to isobaric perturbations. It does alter the criteria for the stability of a medium perturbed by small amplitude sound waves. In the limit of a high background cosmic ray pressure to thermal pressure ratio, the instability in response to high frequency sound waves is suppressed.

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