Satellite X ray mappings of sporadic auroral zone electron precipitation events in the local dusk sector

Details Satellite X ray mappings of sporadic auroral zone electron precipitation events in the local dusk sector Satellite X ray mappings of sporadic auroral zone electron precipitation events in the local dusk sector

Jul 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.3347i&link_type=abstract

Journal of Geophysical Research, vol. 85, July 1, 1980, p. 3347-3359. Research sponsored by the Lockheed Independent Research P

Physics

5

Auroral Zones, Electron Precipitation, Mapping, Satellite Observation, X Ray Imagery, Angular Distribution, Bremsstrahlung, Cadmium Tellurides, Energy Spectra, Geomagnetism, Spectrometers, Time Dependence

Scientific paper

The paper reports simultaneous mappings of bremsstrahlung events from the atmosphere resulting from electron precipitation. The mappings were made from a satellite with an array of collimated cadmium telluride spectrometers. The X-ray intensities and energy spectra were measured over contiguous view directions; the satellite, P78-1, was launched into a sun-synchronous noon-midnight orbit at 600-km altitude, and it provides 5.5-s period continual scans of the X-rays below through its spinning motions. Data for three sporadic events in which the X-ray intensities varied strongly with time showed bursts of 30 to 100 s duration. These X-ray bursts emanated primarily from the dusk sector, a local time region where few balloon X-ray measurements have been reported. The X-ray fluxes were asymmetric about local dusk, the intensities at earlier times being quite low. It was estimated that the total number of electrons precipitating into the atmosphere during one of the bursts in which precipitation was confined to a small spatial region was about 10 to the 23d/s.

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