Diagnosing and Modeling Distortions of the Subauroral Electric Field

Details Diagnosing and Modeling Distortions of the Subauroral Electric Field Diagnosing and Modeling Distortions of the Subauroral Electric Field

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsm23d..05g&link_type=abstract

American Geophysical Union, Spring Meeting 2007, abstract #SM23D-05

Statistics

Computation

2712 Electric Fields (2411), 2730 Magnetosphere: Inner, 2736 Magnetosphere/Ionosphere Interactions (2431), 2778 Ring Current, 2788 Magnetic Storms And Substorms (7954)

Scientific paper

During geomagnetic activity, coupling between the ring current and sub-auroral ionosphere (via region 2 Birkeland currents) can create ionospheric electric fields--either enhancements such as the subauroral polarization stream (SAPS), or shielding--that have a dramatic effect on the dynamics of the plasmas of the inner magnetosphere. We compare the output of a simple computational model of the plasmasphere to observations, both remote sensing by the Imager for Magnetopause-to-Aurora Global Exploration (IMAGE) satellite and in situ by the geostationary satellites of the Los Alamos National Laboratory (LANL), and show agreement to within 0.2-0.7 RE of the observed plasmapause and/or plume location. These comparisons clearly demonstrate the need to include this region 2 coupling system. Observations during substorms and mild convection enhancements imply that there is a finite speed for the effects of substorms and convection to propagate through the inner magnetosphere, and that this propagation can create turbulent-like flow bursts and undulatory motions at the plasmapause boundary. We show that these effects are a consequence of the finite speed of plasma responding to subauroral convection.

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