Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa33c..08g&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA33C-08
Physics
[2411] Ionosphere / Electric Fields, [2441] Ionosphere / Ionospheric Storms, [2463] Ionosphere / Plasma Convection
Scientific paper
Dynamical magnetospheric processes including storms and substorms produce rapid changes in magnetospheric circulation and configuration that have significant impacts on the circulation and configuration of plasma in the underlying conjugate ionosphere. A variety of explanations have been proposed to explain the response of the ionosphere to these magnetospheric processes including the generation of disturbance-driven thermospheric wind patterns and the penetration of high-latitude electric fields to lower latitudes. Numerical simulations have indicated that both types of processes may be important, but, as yet, there have been insufficient globally distributed measurements of ionospheric plasma convection to evaluate their relative importance. More importantly, we have been unable to deploy large numbers of magnetospheric spacecraft capable of resolving the large scale evolution of magnetospheric plasma circulation. One possible path to resolve this dilemma is to use the recently expanded SuperDARN radar network to obtain an improved understanding of the large scale evolution of ionospheric and magnetospheric plasma circulation under disturbed conditions. In recent years, there have been several polar cap radars and several mid-latitude radars added to the SuperDARN network in the North American sector. With these radars, it is possible to obtain concurrent radar measurements of ionospheric plasma convection on magnetic field lines that extend from the outer regions of the plasmasphere throughout the outer magnetosphere. In this paper, we present several examples of how global scale convection patterns evolve during magnetospheric storms and substorms on time scales of minutes over large regions of the ionosphere and magnetosphere. We discuss these observations in terms of proposed models
Greenwald Ray A.
Lester Mark
Ruohoniemi Michael J.
Sofko George J.
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