Physics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jatp...53..529f&link_type=abstract
(Thermospheric and ionospheric dynamics; Symposium, Exeter, England, July 1989, Selected Papers. A92-10626 01-46) Journal of Atm
Physics
9
Auroras, Computerized Simulation, F Region, Solar Terrestrial Interactions, Magnetohydrodynamic Flow, Magnetosphere-Ionosphere Coupling, Midlatitude Atmosphere, Thermosphere, Winter
Scientific paper
An analysis is conducted of the effects of magnetospheric forcing, auroral particle precipitation, and solar ionizing flux in the thermosphere and ionosphere at high latitudes. The UCL-Sheffield coupled model is used to determine the structure of the ionospheric F-region as well as troughs in portions of the auroral oval toward the equator. The model, which simulates high solar activity and moderate geomagnetic activity during the winter solstice, demonstrates that the convective electric field is responsible for plasma transport. The high-latitude large-scale features of the region are shown to be highly influenced by the plasma transport including the subauroral trough. Auroral precipitation generates increases in ion densities and molecular species which tend to negate the direct ionization; these effects suggest that the F-region ion densities increase as a result at high latitudes.
Fuller-Rowell Tim J.
Moffett R. J.
Quegan Shaun
Rees David
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