Physics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.1031c&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 18, June 1991, p. 1031-1034.
Physics
47
Auroras, Eiscat Radar System (Europe), Field Aligned Currents, Incoherent Scattering, Radar Tracking, Current Density, Ultrahigh Frequencies, Very High Frequencies
Scientific paper
Enhancements of one, or both, of the ion-aocustic peaks of incoherent scatter spectra in the auroral ionosphere have been observed with the EISCAT UHF and VHF radars. All occurrences for which optical data are available show these events to coincide with active, unusually intense, red auroral forms in the vicinity of the radar beam at high altitudes. Both the optical and the radar signatures are expected to be caused by large fluxes of low energy electrons. Analyses of the measured spectra, in which the electron drift speed is estimated, imply field-aligned current densities up to several mA/sq m. The vertically-directed VHF observations from 1000 km altitude reveal that the spectral enhancements, which are transient features in field-aligned measurements, can exist for up to several minutes.
Collis P. N.
Haggstrom Ingemar
Kaila K.
Rietveld Michael T.
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