Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa13c..04l&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA13C-04
Physics
[2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2435] Ionosphere / Ionospheric Disturbances, [2437] Ionosphere / Ionospheric Dynamics, [2441] Ionosphere / Ionospheric Storms
Scientific paper
Magnetospheric electric fields driven by the solar wind and interplanetary magnetic field can directly penetrate from high latitudes to lower latitudes. In addition, penetration electric fields exhibit distinctive longitudinal/local time variations, with a strongly eastward penetration electric field on the dayside, which is the main cause of positive ionospheric storms, and a westward electric field on the nightside, which may lead to negative storms. Furthermore, enhanced Joule heating dissipation in the high-latitude polar region produces large pressure gradients that drive neutral winds equatorward toward mid and low latitudes, even into the opposite hemisphere. These neutral winds surges also have a strong longitudinal dependence, and thus produce longitudinal structures in the mid- and low-latitude ionosphere. This paper presents a combined observational and modeling study of the latitudinal and longitudinal variations during two events of penetration electric fields on 9 November 2004 and 17 April 2002, respectively. The NCAR Thermosphere-Ionosphere Electrodynamic General Circulation Model (TIEGCM) will be used to illustrate some of the salient features in the ionosphere, including vertical ion drift, electron density, and global TEC. An emphasis is placed on the inter-comparison of the simulation results with radar and satellite data in order to unveil the physical processes responsible for the observed latitudinal and longitudinal variations in the mid- and low-latitude regions.
Goncharenko Larisa P.
Lu Gang
Nicolls Michael J.
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