Physics
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.2079w&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 20, p. 2079-2081.
Physics
4
Critical Velocity, Light Emission, Spaceborne Experiments, Visual Observation, Xenon, Chemical Release Modules, Photoionization
Scientific paper
The ACTIVNY satellite launched on Sept. 30, 1989 was a platform for a suite of active plasma experiments, including releases of Xe gas to test Alfven's critical velocity effect. Three releases were done over Alaska and three over Utah, all fully illuminated by sunlight. We attempted optical observations from ground stations in the dark, using various low light level imagers and spectrographs, with narrow bandpass filters on XeI and XeII lines and also in white light. Viewing conditions were very good on several releases, the satellite could tracked easily, but we saw no optical evidence of the releases from any wavelength. We discuss the reasons why optical diagnostics in the visible and near infrared failed to detect emissions from the releases.
Hampton Don L.
Stenback-Nielsen H. C.
Wescott Eugene M.
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