Physics
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.8957z&link_type=abstract
Journal of Geophysical Research, vol. 86, Oct. 1, 1981, p. 8957-8970.
Physics
13
Geomagnetism, Ionospheric Electron Density, Magnetic Fields, Satellite Observation, Electron Precipitation, Energy Spectra, Explorer 51 Satellite, Photoelectron Spectroscopy, Pitch (Inclination)
Scientific paper
Observations of low-energy electron fluxes made over a 6 year period with the photoelectron spectrometer on the AE-C and AE-D satellite are used to investigate electron pitch angles in the low altitude cusp. A 16 point energy spectrum from 2 to 500 eV was obtained at every .25 s, and the location of the cusp was verified by the presence of protons detected by the low-energy electron instrument. Isotropic fluxes of precipitating electrons with Maxwellian energy spectra were observed in the low-altitude cusp, and the presence of low-energy electrons with pitch angles less than 15 deg was determined streaming into the cusp ionosphere. The energies of the streaming electrons sometimes appeared as a peak superimposed on the normal cusp Maxwellian background of isotropic electrons, and it is concluded that the energies and pitch angle distributions of the precipitating electrons may explain the enhancements of auroral emissions and discrete arcs.
Doering John P.
Hoffman Robert A.
Lee Joon Sue
Potemra Thomas A.
Zanetti Laurence J.
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