Non-solar UV produced ions observed optically from the 'Crit I' critical velocity ionization experiment

Details Non-solar UV produced ions observed optically from the 'Crit I' critical velocity ionization experiment Non-solar UV produced ions observed optically from the 'Crit I' critical velocity ionization experiment

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.7749s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, June 1, 1990, p. 7749-7757. Research supported by SERC, Max-Planck-In

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32

Atmospheric Ionization, Critical Velocity, Ion Production Rates, Neutral Beams, Ultraviolet Radiation, Visual Observation, Barium, Oxygen, Particle Collisions, Rocket Sounding, Sunlight

Scientific paper

A critical velocity ionization experiment was carried out with a heavily instrumented rocket launched from Wallops Island on May 13, 1986. Two neutral barium beams were created by explosive shaped charges released from the rocket and detonated at 48 deg to B at altitudes near 400 km and below the solar UV cutoff. Critical velocity ionization was expected to form a detectable ion jet along the release field line, but, instead, an ion cloud of fairly uniform intensity was observed stretching from the release field line across to where the neutral barium jet reached sunlight. The process creating these ions must have been present from the time of the release; the efficiency is estimated to be equivalent to an ionization time constant of 1800 sec. This ionization is most likely from collisions between the neutral barium jet and the ambient atmospheric oxygen, and, if so, the cross section for collisional ionization is 9 x 10 to the -18th sq cm.

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