Thermal Plasma Flow During Plasmaspheric Erosion

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2730 Magnetosphere: Inner, 2740 Magnetospheric Configuration And Dynamics, 2760 Plasma Convection (2463), 2768 Plasmasphere

Scientific paper

Our picture of plasmaspheric erosion is dominated by a simple model of corotational and enhanced convective motion and by many decades of plasmapause boundary measurement. Observational evidence for the plasma motion that moves the outer plasmaspheric boundary inward has largely been unavailable. A new analysis technique for the IMAGE Mission extreme ultraviolet imager (EUV) instrument now offers to reveal motion in the plasmaspheric boundary layer as enhanced global and meso-scale convection penetrates the quite-time plasmasphere. IMAGE EUV provides good global coverage of the striking plasmaspheric erosion that took place on July 10, 2000. During this erosion event divergent flows in the vicinity of the plasmapause and centered initially near 2 hours MLT have been found. Over a period of about 1 hour the center of divergent flow drifts dawnward to almost 4 hours MLT. Plasma flows during this storm and others imaged by IMAGE EUV will be discussed along with their implication for the process of plasmaspheric erosion.

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