Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm21b0268b&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM21B-0268
Physics
2431 Ionosphere/Magnetosphere Interactions (2736), 2463 Plasma Convection (2760), 2704 Auroral Phenomena (2407), 2712 Electric Fields (2411), 2776 Polar Cap Phenomena
Scientific paper
Much of our current understanding of magnetospheric electrodynamics has been based on the assumption that magnetic field lines often behave as electrostatic equipotentials. This assumption is often used to interpret ionospheric measurements in terms of the large-scale circulation of magnetospheric plasma driven by the solar wind. However, the extent to which the equipotential magnetic field-line assumption is justified in different regions of the magnetosphere and under varied geomagnetic conditions has not been adequately verified, largely because of the sparseness of magnetospheric measurements. In this paper we use an empirical magnetic field model to map electric fields measured by the Cluster spacecraft Electron Drift Instrument (EDI) along equipotential magnetic field lines and produce estimates for the F-region ExB plasma drift at the magnetic footpoint in the conjugate ionosphere. These EDI estimates for the ionospheric plasma drift are then compared with direct measurements obtained by the Super Dual Auroral Radar Network (SuperDARN). The degree of consistency between the conjugate measurements is discussed in terms of: (1) the accuracy of the magnetic field model; (2) the validity of the assumption of equipotential magnetic field lines; and (3) the presence of inductive electric fields in the magnetosphere. The study is based on four years of conjugate EDI and SuperDARN measurements obtained at high latitudes under a wide variety of geomagnetic conditions.
Baker Joseph B.
Greenwald Ray A.
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