An asymptotic state of the critical ionization velocity phenomenon

Details An asymptotic state of the critical ionization velocity phenomenon An asymptotic state of the critical ionization velocity phenomenon

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....9012230g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Dec. 1, 1985, p. 12,230-12,234.

Physics

14

Asymptotic Properties, Critical Velocity, Gas Ionization, Ion Production Rates, Neutral Gases, Plasma Acceleration, Electron Impact, Flow Velocity, Ionospheric Ion Density, Momentum Transfer, Plasma Density

Scientific paper

The paper considers the problem of how the momentum of ions created by electron impact ionization of neutrals moving at a speed v(0) perpendicular to the magnetic field through a background plasma is coupled to this plasma. It has been found that the plasma accelerates, and the relative velocity between neutrals and plasma decreases. If this decrease is rapid and large enough, the critical ionization velocity (CIV) phenomenon may turn off. Equations for the evolution of plasma density, electron and ion thermal energy, and plasma velocity have been derived. It was found that the CIV process reaches an asymptotic quasi-steady state, in which the ionization rate reaches a constant value which depends on the properties of the surrounding medium and the value of v(0).

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