The critical ionization velocity phenomenon in astrophysics and solar system plasma physics

Details The critical ionization velocity phenomenon in astrophysics and solar system plasma physics The critical ionization velocity phenomenon in astrophysics and solar system plasma physics

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992adspr..12..303k&link_type=abstract

(Planetary magnetospheric physics II; Proceedings of Symposium 5 and the Topical Meetings of the Interdisciplinary Scientific Co

Physics

Plasma Physics

Critical Velocity, Gas Ionization, Neutral Gases, Plasma Interactions, Plasma Physics, Solar System Evolution, Space Plasmas, Astrophysics, Cosmic Plasma, Energy Transfer, Ion Beams, Magnetohydrodynamic Flow, Nonlinearity, Plasma Waves, Wave Excitation, Wave-Particle Interactions

Scientific paper

An overview of the critical ionization velocity (CIV) phenomenon with respect to astrophysics is presented to examine the limits of its applicability. Alfven's hypothesis regarding the evolution of the solar system is discussed with references to detections of CIV by Voyager 1 and 2 in the Io plasma torus. Theoretical consideration is given to the CIV in general solar-system plasma physics and an analysis is given of the collisionless energy transfer from ions to electrons in the gas ionized by the plasma flow. The review examines the linear theory of plasma-wave excitation by newly ionized atom beams, and treatment is given to the quasilinear relaxation of the ion beam and electron heating. It is shown that wave intensity increases with neutral gas density leading to nonlinear effects that cannot be neglected. This phenomenon is shown to give limits to the applicability of quasilinear theory at which nonlinear effects should be estimated.

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