Physics
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985georl..12..835n&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 12, Dec. 1985, p. 835-838.
Physics
23
Critical Velocity, Earth Magnetosphere, Hot Electrons, Ion Injection, Ion Production Rates, Space Plasmas, Barium, Electron Energy, Energy Dissipation, Gas Ionization, Oxygen Atoms, Particle Collisions, Strontium
Scientific paper
The critical ionization velocity effect requires a superthermal electron population to ionize through collisional impact. Such superthermal electrons can however lose energy to competing atomic processes, as well as to ionization, thus limiting the efficiency of the effect. Considering Ba and Sr magnetospheric injection experiments designed to test the CIV theory, it is found that in both cases roughly 60 percent of the superthermal electron energy is lost on exciting line radiation. Moreover, energy loss to background neutral oxygen places a strict limit on the injected cloud densities for which critical velocity effects are possible; a finding which explains the consistently negative results in radial injection experiments.
Newell Patrick T.
Torbert Roy B.
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