Physics
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jatp...52..519h&link_type=abstract
(EISCAT Scientific Association, International EISCAT Workshop, 4th, Sigtuna, Sweden, June 5-9, 1989) Journal of Atmospheric and
Physics
22
Auroral Zones, Electric Fields, F Region, Ionospheric Composition, Ionospheric Ion Density, Earth Magnetosphere, Eiscat Radar System (Europe), Geomagnetism, Ion Temperature, Oxygen Ions
Scientific paper
F-region density depletions in the afternoon/evening sector of the auroral zone are studied with the EISCAT UHF radar. Four case studies are presented, in which data from three experiment modes are used. In each case the density depletion can be identified with the main ionospheric trough. For the two cases occurring in sunlit conditions the electron densities recovered significantly after the trough minimum. Tristatic ion velocity measurements show the development of poleward electric fields of typically 50-100 mV/m, which maximize exactly in the trough minimum. A special analysis technique for incoherent scatter measurements is introduced, based on the ion energy equation. By assuming that the ion temperature should obey this equation it is possible to fix this parameter in a second analysis and to allow the ion composition to be a free parameter. The results from two experiments with accurate velocity measurements indicate that the proportion of O(+) near the F-region peak decreased from 100 percent in the undisturbed ionosphere to only 10 percent and 30 percent, respectively, in the density minimum of the trough.
Collis P. N.
Haggstrom Ingemar
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