Fast magnetospheric echoes of artificially injected electrons observed above a bright auroral arc

Computer Science – Sound

Scientific paper

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Auroral Arcs, Auroral Echoes, Electric Fields, Rocket Sounding, Adiabatic Conditions, Earth Magnetosphere, Electron Acceleration, Electron Beams, Electron Energy

Scientific paper

Rocket-borne electron beam experiments confirmed earlier observations of fast magnetospheric echoes of artificially injected energetic electrons. A total of 234 echoes were observed at pitch angles from 9 to 10 deg at energies of 1.87 and 3.90 keV. Of these, 102 echoes are unambiguously related to preceding accelerator operations at 2, 4 or 8 keV energy and highest current levels resulting in the determination of transit times of typically 300 to 400 msec. When echoes are present in both energy channels, higher energy electrons lead lower energy ones by 50 to 70 msec. Adiabatic theory applied to the observations yields a reflection height of 3000 to 4000 km.

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