Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm21a0452g&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM21A-0452
Physics
2730 Magnetosphere: Inner, 2760 Plasma Convection, 2768 Plasmasphere, 2778 Ring Current
Scientific paper
Deep plasmaspheric notches can extend over more than 2 RE in radial distance and 3 hours MLT in the magnetic equatorial plane. They appear to be among the largest evacuated features in the exterior plasmaspheric boundary. They can last for days and exhibit varying structure. It appears the origin of notches is shared by low-density channels that result from entrainment of the plasmaspheric convection plume during storm-time recovery. Notches rather than channels result from differences in the location and population of the plume due to differences in the strength of the storm-time convection electric field. Strong convection tends to result in low-density channels, while weaker convection and limited erosion results in notches. Over the 18 events in 2000 have been analyzed. Among these events, notches were found to drift as slowly as 72% of corotation. In only one case was a notch found to drift at the corotation rate with measurement error. On average, notches drift at about 21.5 hours per day or 90% of the corotational rate. Notches also sometimes exhibit interior structures, in particular what appears to be an extended "finger" of dense plasma that forms a W-like feature in IMAGE/EUV images when viewed from Earth-center. Evidence exists such features may be caused by localized, small-scale potential structures caused by injected ring current plasma.
Adrian Mark L.
Gallagher Dennis L.
Liemohn Michael W.
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