Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989plap.work..281c&link_type=abstract
In ESA, Proceedings of an International School and Workshop on Plasma Astrophysics, Volume 1 p 281-283 (SEE N89-24910 18-75)
Astronomy and Astrophysics
Astronomy
Astronomical Models, Electron Distribution, Kinetic Theory, Radio Jets (Astronomy), Anisotropy, Field Strength, Interstellar Magnetic Fields, Magnetohydrodynamic Flow, Space Plasmas, Velocity Distribution
Scientific paper
It is suggested that an astrophysical plasma stream flowing outward from a central object along an open magnetic field line with decreasing field strength generally has anisotropic velocity distributions. The electron distribution function of this type of plasma streams contains a thermally populated region and a stretched out high energy tail (or jet-like) region collimated in the outward direction of the magnetic field line. The argument is based on a global, collisional, kinetic theory. Because the kinetic jets are always pointed along the outward direction of the field lines, they are automatically collimated and assume the geometries dictated by the magnetic field. This result should be useful in the understanding of the basic structures of astrophysical objects as extragalactic radio jets, stellar winds, the solar wind, planetary polar winds, and galactic jets (e.g., SS433).
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