Physics
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10..561v&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 10, July 1983, p. 561-564. Research supported by the Lockheed Independent Re
Physics
8
Auroral Arcs, Auroral Ionization, E Region, Electron Precipitation, Ionospheric Electron Density, Diffuse Radiation, High Energy Electrons, Incoherent Scatter Radar, Isis-B
Scientific paper
An example of a detached arc that was observed simultaneously by both the ISIS-2 satellite and the Chatanika incoherent scatter radar in the evening sector trough region is presented. The observations, made on Feb. 26, 1977 at 0737 UT, show that the detached arc is associated with E-region ionization enhancements, with maximum electron densities of about 100,000/cu cm at 95 km altitude. The altitude profiles of ionization in the arc are consistent with the hard electron energy distribution that had been previously inferred from the ISIS spectrophotometric and particle measurements. In addition, the radar measurements show that the detached arc observed by ISIS-2 was composed of several narrow arcs, approximately 10 to 20 km wide, that were periodically spaced in latitude and extended in longitude, suggesting the presence of a precipitation mechanism for residual plasma sheet energetic electrons.
Anger Clifford D.
Murphree John S.
Vondrak Richard R.
Wallis Don D.
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