Physics
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19..973t&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 10, May 22, 1992, p. 973-976.
Physics
13
Atmospheric Ionization, Atmospheric Physics, Barium, Ionospheric Currents, Plasma Jets, Electron Distribution, Ion Distribution, Magnetohydrodynamic Stability
Scientific paper
Observations of electron and ion distributions inside a fast neutral barium jet in the ionosphere show significant fluxes within 4 km of release, presumably related to beam plasma instability processes involved in the Critical Ionization Velocity (CIV) effect. Electron fluxes exceeding 5 x 10 exp 12/sq cm-str-sec-keV were responsible for ionizing both the streaming barium and ambient oxygen. Resulting ion fluxes seem to be consistent with 1-2 percent ionization of the fast barium, as reported by optical observations, although the extended spatial distribution of the optically observed ions is difficult to reconcile with the in situ observations. When the perpendicular velocity of the neutrals falls below critical values, these processes shut off. Although these observations resemble the earlier Porcupine experimental results (Haerendel, 1982), theoretical understanding of the differences between these data and that of earlier negative experiments is still lacking.
Kletzing Craig A.
Liou Kan
Rau D.
Torbert Roy B.
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