Physics
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9619291r&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Nov. 1, 1991, p. 19,291-19,305. Research supported by NSERC.
Physics
77
Auroral Zones, Earth Ionosphere, Eiscat Radar System (Europe), Ion Acoustic Waves, Ion Temperature, F Region, Incoherent Scattering, Radar Scattering, Ultrahigh Frequencies
Scientific paper
High-resolution incoherent scatter radar spectra obtained at 933 MHz by the EISCAT European Incoherent Scatter UHF radar on February 14, 1990 are presented. The spectra show intense short-lived enhancements of the ion acoustic shoulders from 138 to 587 km altitude, both along the magnetic-field-aligned direction and at angles that are within 15 deg from that direction. These observations indicate that field-aligned thermal electron drifts are destabilizing the ion acoustic waves. They confirm and extend the report of similar echoes by Foster et al. (1988). It is suggested that field-aligned flows of soft electrons depositing their energy at horizontally poor conducting F region heights are the cause of parallel electric fields in the ionosphere.
Jean-Pierre St.-Maurice
Collis P. N.
Rietveld Michael T.
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