Abstract
Electron density profiles measured by the EISCAT radar during auroral activity can be inverted to determine the energy-flux spectrum of precipitating electrons responsible for the ionisation. Using short time resolutions we are able to resolve even the monoenergetically peaked spectra characteristic of discrete auroral arcs. We apply this technique to measurements made during a number of auroral substorms and make a classification of the spectra according to the stage of the substorm and the optical signature. The Viking satellite provides direct measurements of electron and ion energy-flux spectra at altitudes of 2000–7000 km over the auroral oval during the same events. Combining these two data sets we discuss the reliability of the spectra derived from EISCAT and the evidence for particle acceleration below the satellite.
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