Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm13e..03p&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM13E-03
Physics
[2712] Magnetospheric Physics / Electric Fields, [2730] Magnetospheric Physics / Magnetosphere: Inner, [2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [2760] Magnetospheric Physics / Plasma Convection
Scientific paper
The cyclic erosion and recovery of the outer boundary of the Earth's plasmasphere is achieved through the creation and subsequent convection of plasmaspheric plumes. The physics of this region, known as the plasmaspheric boundary layer, or, PBL, involves the interaction of the cold, dense plasma of the plasmasphere with the hotter, less dense plasma of the plasma sheet, and their active coupling to the ionosphere. Plume dynamics have been studied using both remote and in-situ sensing techniques from several different magnetospheric missions. Recently, over 750 plumes observed by Cluster during its first five years of operation have been analyzed [Darrouzet et al., Ann. Geophys., 2008]. Plume occurrence as a function of geomagnetic activity, as well as plume transverse size, magnetic local time distribution, L-position and density variation were discussed. The present study uses the same plume dataset to analyze plume motion using in-situ electron drift velocity measurements. Preliminary results indicate a rich variety of drift signatures with significant departures in both magnitude and direction from the nominal corotation motion expected for the plasmasphere proper.
Darrouzet Fabien
Puhl-Quinn Pamela Ann
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