Physics – Plasma Physics
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9913263h&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A7, p. 13,263-13,271
Physics
Plasma Physics
1
Atomic Recombination, Barium Ion Clouds, Doppler Effect, Emission Spectra, Photoionization, Vaporizing, Velocity Distribution, Atmospheric Ionization, Plasma Physics
Scientific paper
Intensity-calibrated color video recordings of three barium-shaped charge injections in the ionopshere were used to determine the initial ionization, the column density corresponding to unity optical depth, and the yield of vaporized barium in the fast jet. It was found that the initial ionization at the burst was less than 1% and that 0% burst ionization was consistent with the observations. Owing to the Doppler shift, the column density for optical thickness in the neutral barium varies somewhat according to the velocity distribution. For the cases examined here, the column density was 2-5 x 10(exp 10) atoms/sq cm. This value, which occurred 12 to 15 s after release, should be approximately valid for most shaped charge experiments. The yield was near 30% (15% in the fast jet) for two of the releases and was somewhat lower in the third, which also had a lower peak velocity. This study also demonstrated the applicability of the computer simulation code developed for chemical releases by Stenbaek-Nielsen and provided experimental verification of the Doppler-corrected emission rates calculated b Stenbaek-Nielsen (1989).
Hallinan Thomas J.
Hoch Edward L.
Stenbaek-Nielsen Hans C.
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