Physics
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987angeo...5..449l&link_type=abstract
(URSI and High Altitude Observatory, International Symposium on Large-Scale Processes in the Ionospheric-Thermospheric System, B
Physics
4
Atmospheric Energy Sources, Auroral Zones, F Region, Ionospheric Composition, Ionospheric Ion Density, Electric Fields, Incoherent Scatter Radar, Ionospheric Electron Density, Particle Precipitation
Scientific paper
In the auroral zone, in addition to solar energy input to the atmosphere, energy is deposited on occasion by particle precipitation and electric fields. These energy inputs, often very large, modify the circulation and the composition of the neutral atmosphere and of the ionosphere. In particular, the ion composition in the lower F-region may deviate from the photochemical equilibrium. Such modifications are qualitatively discussed and an example of the variations of O(+) abundance measured with the EISCAT facility is presented. The method of Lathuillere et al. (1983), which allows direct determination of ion composition from incoherent scatter autocorrelation functions, is used on April 16-17, 1985 measurements. It is shown that an abrupt ion composition variation occurring in the middle of the night can be explained by the combined effects of particle precipitations and Joule heating.
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