Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa21b..08f&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA21B-08
Physics
[2415] Ionosphere / Equatorial Ionosphere, [2447] Ionosphere / Modeling And Forecasting
Scientific paper
Ionospheric responses to sudden stratospheric warmings (SSWs) have been observed using radar, satellites, and GPS-TEC measurements in recent years. During the January 2009 SSW event, ionospheric vertical drift at Jicamarca longitude showed a strong early morning upward drift and afternoon downward drift. In the Asian sector, the equatorial electrojet (EEJ) showed eastward current occurred in the early morning and westward current in the afternoon associated with changes in zonal electric field during the same period. The Whole Atmospheric Model (WAM) with data assimilation scheme is capable of simulating real SSW events and provides information on thermospheric wind. We drive the electrodynamics in the Coupled Thermosphere Ionosphere and Plasmasphere with Electrodynamics model (CTIPe) using the WAM winds in January 2009 to study the response of ionospheric drift during the SSW event. Simulation results are validated with vertical drift observation at Jicamarca and EEJ in the Asian sectors. The early morning upward drift and afternoon downward drift can be observed in all longitudes in the simulations. However, the occurrence time of early morning upward drift and afternoon downward drift has significant phase difference between different longitudes. Possible mechanisms which can potentially cause the longitudinal variation of drifts are examined. In this presentation, we will discuss the importance of migrating tides, non-migrating tides and strength of geomagnetic field in modulating the longitudinal variation of the ionospheric vertical drift during the January 2009 SSW event.
Akmaev Rashid A.
Anderson Dale N.
Fang Taotao
Fuller-Rowell Tim J.
Wang Hai-Hong
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