Observations of 10-eV to 25-keV electrons in steady diffuse aurora from Atmosphere Explorer C and D

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Auroral Spectroscopy, Diffuse Radiation, Electron Energy, Electron Precipitation, Energy Spectra, Satellite Observation, Electron Flux Density, Explorer 51 Satellite, Mathematical Models, Photoelectrons, Spectrometers

Scientific paper

Electron energy spectra from 10 eV to 25 keV have been obtained from steady diffuse auroral forms at altitudes above 150 km by the Atmosphere Explorer C and D spacecraft. Overlapping coverage of the energy range was provided by the photoelectron spectrometer experiment (10-500 eV) and the low-energy electron experiment (0.2-25 keV). The spectral shape between 10 and 20 eV is independent of altitude between 150 and 270 km, has variable energy dependence between about 20 and 150 eV, and above approximately 150 eV has energy dependence determined primarily by the details of the energy spectrum of electrons incident on the atmosphere. The observed results are in satisfactory agreement with two recently published model calculations.

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