Multi-point measurements of plasma drifts and densities near the plasmapause

Details Multi-point measurements of plasma drifts and densities near the plasmapause Multi-point measurements of plasma drifts and densities near the plasmapause

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm22a0566g&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM22A-0566

Physics

2712 Electric Fields (2411), 2760 Plasma Convection, 2768 Plasmasphere

Scientific paper

The coupling between the ionosphere, the plasmasphere and the outer magneto- sphere is not yet well understood. Erosion and recovery of the plasmasphere are important issues that are inherently related to the global dynamics and structure of the ionosphere and magnetosphere. At the plasmapause, the density decreases a few orders of magnitude over a relatively short distance and the plasma drift is switched from corotation into convection. Sometimes these changes occur very suddenly, sometimes slowly, and under some conditions, the transitions are quite oscillatory. This appears very clearly in the measurements from the Polar satellite that has encountered the plasmapause regions over 10,000 times. Now, the multi-point Cluster observations allows us to investigate the meso-scale (100-1000 km) structures in more detail so that spatial and temporal features can be separated from the data. We utilize measurements from the electric field experiment that measures both the plasma drift and total plasma density along the satellites' trajectories across the plasmapause. We present different kind of events, such as plasmapause density structures with various spatial and temporal scales, significant radial plasma drifts on both sides of the plasmapause, plasmpause modulation by wave activity (2-minute surface waves) causing plenty of plasmapause crossings (while the satellites are skimming the boundary), radial oscillation of the plasmapause ("breathing") etc.

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