Physics
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3101801g&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 1, CiteID L01801
Physics
5
Magnetospheric Physics: Electric Fields (2411), Magnetospheric Physics: Magnetosphere-Inner, Magnetospheric Physics: Plasmasphere
Scientific paper
The IMAGE extreme ultraviolet (EUV) imager obtained global images of the plasmasphere erosion of 10 July 2000, in which the nightside plasmapause moved inward by about 2 RE during 5-8 UT. We use plasmapause motion to infer the electric (E) field component tangent to the moving plasmapause; in general we lack knowledge of the perpendicular E-field component. In the midnight-to-dawn quadrant where the plasmapause shape is very nearly circular, the tangential E-field component is equal to the azimuthal electric field Eϕ. Peak westward E-fields of 0.6-1.3 mV/m were found at the plasmapause between L ~ 4-6, an inner magnetospheric E-field that was 25% of the solar wind E-field. The MLT-concentration of the inferred E-field suggests that convective flows may produce partial indentation of the nightside plasmapause (especially in the midnight-to-dawn sector) that widens as the edges of the indentation propagate azimuthally.
Goldstein Jeffrey Jay
Reiff Patricia H.
Sandel Bill R.
Wolf Richard A.
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