Ion compositions in the auroral ionosphere as observed by EISCAT

Details Ion compositions in the auroral ionosphere as observed by EISCAT Ion compositions in the auroral ionosphere as observed by EISCAT

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985angeo...3..557l&link_type=abstract

Annales Geophysicae (ISSN 0755-0685), vol. 3, Sept.-Oct. 1985, p. 557-567.

Physics

3

Auroral Zones, Incoherent Scattering, Ionospheric Composition, Ionospheric Ion Density, Annual Variations, Diurnal Variations, Eiscat Radar System (Europe), F Region, Ion Distribution

Scientific paper

The Lathuillere et al. (1983) method for direct composition data extraction from incoherently scattered spectra obtained in the ionospheric transition region between atomic ion and molecular ion domains is presently applied to EISCAT measurements in the auroral zone. It is found that the hourly mean daily variation of the height where atomic O(+) ions contribute 40 percent to the total ion density varies with solar zenith angle. This parameter decreases by 20 km between summer and winter. These results indicate that, on an hourly mean basis, the bottom side F-region auroral ionosphere is in photochemical equilibrium; severe disturbances can occur in ion composition at these heights, however, where auroral events introduce larger variations.

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