Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa14a..02f&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA14A-02
Physics
[2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2437] Ionosphere / Ionospheric Dynamics, [2441] Ionosphere / Ionospheric Storms, [2443] Ionosphere / Midlatitude Ionosphere
Scientific paper
Ionospheric plasma enhancement and redistribution at low, mid, and auroral latitudes during major geomagnetic disturbances involves a complex interplay among magnetospheric forcing, solar production, ionospheric processes, season, local and Universal Time (UT), and characteristics of the terrestrial magnetic field. Dramatic features occur with repeatable, but not completely understood, features. These include equatorial depletions, enhancements of the equatorial anomalies, mid-latitude total electron content enhancements near sunset (the "dusk effect"), and at high latitudes sunward-streaming plumes of storm enhanced density (SED) related to plasmaspheric erosion by ring current-driven (SAPS) flow channels and electric fields. An apparent longitude or UT-dependency of some stormtime effects has been noted, and a number of processes have been proposed which might contribute to such observations. Here we examine the effects of peculiarities in the mid-latitude solar-produced E-region conductance on the M-I (magnetosphere-ionosphere) coupling processes associated with the some of the observed ionospheric features and effects. Satellite and ground-based TEC observations are combined with satellite (DMSP) and radar observations of ionospheric plasma concentration and dynamics. Offset of poles, seasonal effects, and magnetic field distortion by the south Atlantic anomaly produced a distorted solar-terminator configuration in the dusk sector during the July 15, 2000 superstorm. Contours of constant Southern Hemisphere E-region shadow height (50 km to 500 km in 50 km steps) are plotted for a uniform grid of latitude/longitude points at 200km altitude. Polarization charge buildup associated with the resultant E-region conductance gradient causes westward and poleward ionospheric plasma redistribution along the contours shown.
Coster Anthea J.
Erickson Phil J.
Foster Christopher J.
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