Physics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991angeo...9..259b&link_type=abstract
Annales Geophysicae (ISSN 0939-4176), vol. 9, April 1991, p. 259-266. Research supported by Oesterreichische Akademie der Wissen
Physics
1
Antarctic Regions, Auroral Zones, Electron Precipitation, Satellite Observation, Spacelab, Circular Orbits, Energetic Particles, Noaa 7 Satellite
Scientific paper
Electron flux measurements were made in the energy range 0.1 to 12.5 keV, by the electron spectrometer 1ES019 on board Spacelab 1, during the period 29 November to 7 December 1983. The spacecraft was in a 57 deg inclination circular orbit at an altitude of about 250 km with an orbital period of 90 min. Although the experiment was originally designed for artificial electron beam response observations, several periods of natural energetic electron precipitation were also recorded and these have been surveyed and catalogued. The data are interesting because of the high resolution of the electron spectrometer, the relatively low spacecraft altitude for the observations and the path of Spacelab 1 almost along the auroral oval. On 30 November 1983 Spacelab 1 observed electron precipitation during four successive Southern Hemisphere passes, one of which is of particular interest as the NOAA-7 Satellite, which measured electron flux in the energy range of 0.3 to 20 keV at an altitude of about 850 km, was then quite close in space and time. As correlative riometer and magnetometer observations suggest that auroral conditions remained stable during the 25-min period between the two sets of observations, the observations are used to infer the gross spatial structure of the auroral precipitation over the midnight sector. Comparison of the electron energy spectra observed by Spacelab 1 and NOAA-7 at different magnetic local times and at different altitudes suggests a high degree of longitudinal homogeneity in the precipitation.
Barrow Colin H.
Evans Silvan D.
Watermann Jürgen
Wilhelm Klaus
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