Cosmic rays and the Parker instability

Details Cosmic rays and the Parker instability Cosmic rays and the Parker instability

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.215..161n&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 215, July 15, 1985, p. 161-170.

Astronomy and Astrophysics

Astronomy

5

Cosmic Rays, Interstellar Gas, Interstellar Magnetic Fields, Magnetohydrodynamic Stability, Milky Way Galaxy, Radiation Pressure, Anisotropy, Magnetic Flux, Molecular Clouds, Stress Tensors

Scientific paper

The Parker instability of the galactic gas layer with a horizontal magnetic field is re-analysed relaxing the assumption of isotropic cosmic ray pressure. Using the Chew-Goldberger-Low approximation for the stress tensor it is shown that the anisotropic cosmic ray pressure stabilizes the gas layer, in contrast to the effect of an isotropic pressure. In view of certain difficulties in justifying the use of an isotropic pressure, the applicability of the Parker instability to the Galactic gas layer is therefore called into question.

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