Dynamical coupling of the auroral F-region ionosphere and thermosphere - Case studies

Details Dynamical coupling of the auroral F-region ionosphere and thermosphere - Case studies Dynamical coupling of the auroral F-region ionosphere and thermosphere - Case studies

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jatp...46..625a&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 46, June-July 1984, p. 625-633.

Computer Science

Sound

16

Auroral Zones, F Region, Ionospheric Sounding, Thermosphere, Eiscat Radar System (Europe), Ion Temperature, Ionospheric Electron Density, Ionospheric Ion Density, Summer

Scientific paper

During two 24-h periods of EISCAT observations in the summer of 1982, the F-region ion temperature and density respond differently before and after midnight to large ion convective flows. Such observations were reported at Chatanika (Alaska) by Baron and Wand (1983); however, the mechanism invoked to interpret these measurements (large day-to-night variation in electron density affecting the coupling between ions and neutrals) appears insufficient, for summer conditions, to account for the EISCAT observations. Hence it is proposed, with the support of Fabry-Perot observations and numerical models, that in addition to the electron-density asymmetry, the presence of a large southward neutral wind around midnight induces, through Coriolis coupling, a zonal neutral wind of an opposite direction to the convective flow. This enhances considerably the frictional energy and momentum transfer between ions and neutrals in the postmidnight sector.

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