Physics
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.6647s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 90, July 1, 1985, p. 6647-6651.
Physics
9
Auroral Arcs, Electron Precipitation, Data Processing, Electron Counters, Electron Energy, Electron Flux Density, Electron Spectroscopy, Flicker, Periodic Variations, Pitch (Inclination), Rocket-Borne Instruments
Scientific paper
Electron spectra associated with two aurorae observed by ground-based television are reported. One auroral arc was observed to flicker, large variations in the precipitated electron energy occurring on a time scale of 114 ms. The major variations occur at the higher energies of the 0.5-20 keV range covered by the detectors. Changes in the particle flux occur primarily in the pitch angle range 0 to 60 deg. Analysis of the video data shows a larger variation in intensity along the lower border of the arc in keeping with the results of the electron spectra. The second arc was not observed to flicker, and the associated electron spectra and video data show no large variations in precipitated electron energy or video intensity modulation. While pitch-angle distributions tend to be field-aligned in the first arc, the distributions in the second arc are nearly isotropic or peaked from 60 to 90 deg in the downward hemisphere.
Anderson Hugh R.
Spiger R. J.
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