Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa21a..05r&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SA21A-05
Physics
2411 Electric Fields (2712), 2415 Equatorial Ionosphere, 2431 Ionosphere/Magnetosphere Interactions (2736), 2435 Ionospheric Disturbances, 2736 Magnetosphere/Ionosphere Interactions
Scientific paper
Storm-time ionospheric electric-field disturbances at middle and low latitudes are generated both by direct magnetosphere-ionosphere interactions at high latitudes and by secondary effects of disturbance thermospheric winds. These disturbance electric fields can have a strong influence on the equatorial ionosphere. Using the NCAR Magnetosphere-Thermosphere-Ionosphere-Electrodynamics General Circulation Model (MTIEGCM), we simulate low-latitude electric-field disturbances associated with direct penetration from high latitudes and with secondary generation by disturbed thermospheric winds. The simulations display a number of features observed in equatorial electric fields on time scales of minutes to hours. Models like the MTIEGCM, together with simultaneous global observations of ionospheric electric fields and thermospheric winds, can help clarify the relative importance of the different mechanisms that produce ionospheric disturbances.
Peymirat Christophe
Richmond Arthur D.
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