Outlying plasmasphere structure detected by whistlers

Physics – Plasma Physics

Scientific paper

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Earth Magnetosphere, Plasma Density, Plasma Diagnostics, Whistlers, Antarctic Regions, Dense Plasmas, Electron Density Profiles, Night Sky, Ogo-5, Plasma Physics

Scientific paper

Broadband whistler data obtained at two Antarctic stations during conditions of magnetic quieting after moderate disturbances are used to study large-scale structure in equatorial plasma density at geocentric distances of about 3 to 6 earth radii. Three case studies are described which support satellite results by showing outlying high-density regions at about 4 to 6 earth radii that are separated from the main plasmasphere by troughlike depressions with approximate widths of 0.2 to 1 earth radius. Observations during deep quieting suggest approximate rotation with earth for the structure formed during a previous moderate disturbance in the dusk sector, The present results support other theoretical and experimental evidence that the dusk sector is of major importance in the generation of outlying density structure and that at least a major class of the structures developing near 4 earth radii are tail-like in nature, being joined to the main body of the plasmasphere.

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