Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...251..713k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 251, no. 2, Nov. 1991, p. 713-722.
Astronomy and Astrophysics
Astrophysics
10
Galactic Cosmic Rays, Magnetohydrodynamic Waves, Shock Waves, Stellar Winds, Wave Generation, Algorithms, Boundary Conditions, Magnetohydrodynamics, Mathematical Models, Space Plasmas
Scientific paper
The modification of a stellar wind by galactic cosmic rays is investigated in a three-fluid hydrodynamical model. The model consists of a stellar wind plasma, cosmic rays, and Alfven waves. The cosmic rays are coupled to the wind plasma via hydromagnetic waves (say, Alfven waves) which in turn are produced by the cosmic ray streaming instability. The solar wind is taken as an example. When compared with the cosmic-ray-modified solar wind without waves, the presence of waves has a minor influence on the bulk flow. However, the cosmic ray pressure is larger in the inner solar cavity due to the reduction of outward convection velocity. Moreover, if the diffusion coefficient of the cosmic rays is inversely proportional to the wave pressure, then significant modulation may come from a region outside the termination shock because of the very efficient wave generation by the shock.
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