Physics
Scientific paper
Aug 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.8705h&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Aug. 1, 1988, p. 8705-8712.
Physics
23
Barium Ion Clouds, Earth Ionosphere, Flame Ionization, Ionospheric Ion Density, Magnetohydrodynamic Waves, Shaped Charges, Solar Activity Effects, Electric Fields, Geomagnetism, Kinetic Energy, Metal Vapors
Scientific paper
Data from 36 Ba shaped-charge releases carried out at an angle of less than 25 deg to the magnetic field, by the technique of Wescott et al. (1972) and Michel (1974), were examined for evidence of a sustained rate of ionization in excess of that attributable to sunlight. In four of the experiments, the time constant for the decay of the neutrals was measured using an ultrasensitive color TV camera and was found to have a value of about 30 sec, consistent with slow (solar) ionization. Although the qualitative appearance of most jets was found to be consistent with a slow process of ionization, some releases produced a thin confined jet that was suggestive of rapid ionization. Two of these jets were analyzed in detail, but no evidence of anomalous ionization was produced. The data obtained in this work agree with the geometrical predictions of the Swift model.
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