Theory for the critical ionization velocity phenomenon

Details Theory for the critical ionization velocity phenomenon Theory for the critical ionization velocity phenomenon

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32..903a&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 32, July 1984, p. 903-906.

Physics

11

Gas Ionization, Hot Electrons, Ionization Coefficients, Plasma Heating, Critical Velocity, Electron Energy, Electrostatic Waves, Ion Density (Concentration), Ion Temperature, Ionic Diffusion, Macroscopic Equations, Magnetohydrodynamic Stability

Scientific paper

The critical velocity for the explosive ionization of a neutral gas flowing in a magnetic field and a background plasma is formulated using a macroscopic theory, assuming an unstable velocity distribution for the newly formed ions (NFI) and electron heating by the resulting fluctuating electric field. The initial conditions under which the critical velocity can operate are defined, and the unstable distributions exhibited by the NFI and the background ions are classified. The threshold value of the sum of the NFI number density and the hot-electron energy density is shown to depend on the NFI collisional loss rate and velocity diffusion coefficient.

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