Plasmaspheric Electron Density Distributions Sampled by Radio Plasma Imager on the IMAGE Satellite

Details Plasmaspheric Electron Density Distributions Sampled by Radio Plasma Imager on the IMAGE Satellite Plasmaspheric Electron Density Distributions Sampled by Radio Plasma Imager on the IMAGE Satellite

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm11a0771f&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM11A-0771

Physics

2730 Magnetosphere: Inner, 2740 Magnetospheric Configuration And Dynamics, 2768 Plasmasphere, 2788 Storms And Substorms, 2799 General Or Miscellaneous

Scientific paper

Distribution of plasmaspheric density changes in response to plasma electrodynamical processes in both the ionosphere and magnetosphere. During a geomagnetic storm, for example, the plasmasphere can significantly diminish in size during the main phase of the storm and relax to regain its more normal size during recovery phase. During unusually quiet times, the plasmasphere can become quite large. The processes by which the plasmasphere is eroded and refilled are still areas of active research [Carpenter and Lemaire, 1997]. Previous in situ observations (e.g., CRRES) have shown that the plasmasphere has a lot of structures [Carpenter et al., 2000], quite possibly results of plasma dynamical processes. Recent global EUV images obtained by IMAGE also reveal large-scale plasma structures as well as large-scale variations of the plasmasphere resulting from magnetospheric activities. In this paper, we investigate the large-scale plasmaspheric density variations as a function of solar wind and geomagnetic activities by analyzing a large collection of passive RPI observations of quasi-thermal noise through the plasmasphere obtained over the first year of the IMAGE mission. We will compare our results with existing models of plasmaspheric density distributions. Carpenter, D. L., and J. Lemaire, Erosion and recovery of the plasmasphere in the plasmapause region, Space Sci. Rev., 80, 153, 1997. Carpenter, D. L., R. R. Anderson, W. Calvert, and M. B. Moldwin, CRRES observations of density cavities inside the plasmasphere, J. Geophys. Res., 105, 23323, 2000.

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