Physics
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.5778m&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 88, July 1, 1983, p. 5778-5782.
Physics
59
Airglow, Earth Ionosphere, Equatorial Atmosphere, Plasmasphere, Space Plasmas, All Sky Photography, Depletion
Scientific paper
A photographic data base of several hundred airglow depletion patterns has been obtained using an image intensified, all-sky 6300 A airglow imaging system operating on Ascension Island in early 1981. The geometrical characteristics of plasma depleted regions were determined over the 400-1200 km altitude region above the equator by mapping the airglow depletion features along geometric field lines to the equatorial plane. Results show that single or linear depletions tilted toward the west with an average skewness of 0.6 deg longitude west/100 km altitude, which corresponds to a zenith angle tilt of approximately 40 deg at a height of 800 km. Since this tilt increased with local time during the evening hours, an effective velocity shear of approximately 0.05 m/s/km is required to account for the observed evolution. In addition, the depletion geometry in several cases was found to show a wishbone or bifurcated pattern, which had a mean height of bifurcation of 740 km and tilt factors very similar to those found for linear depletions observed during the same local time periods.
Mendillo Michael
Tyler Anthony
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