Refilling of geosynchronous flux tubes as observed at the equator by GEOS 2
During periods of extended quiet geomagnetic activity the geosynchronous satellite orbit lies inside the plasmasphere. Five such periods were observed by the GEOS 2 satellite. During the initial 48 hours of such periods the equatorial plasma flux tube density increases at 30 to 50 per cu cm/day. However, on reaching approximately 100 per cu cm the refilling rate decreases, and refilling is limited. Only when the density reaches approximately 100 per cu cm do the plasma characteristics and fluctuations appear to be plasmaspheric and the flow predominantly corotational. The hot outer zone of the plasmasphere is highly structured in density and temperature when viewed from a corotating satellite. This region also has a relatively dense population of warm subkilovolt electrons. These warm electrons whose density is approximately 1 percent to 50 percent of the cold plasma may be the heat source for the hot outer zone ions. 36 references.
- Research Organization:
- London Univ. College, Dorking, England
- OSTI ID:
- 6019414
- Journal Information:
- J. Geophys. Res.; (United States), Vol. 90
- Country of Publication:
- United States
- Language:
- English
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