Abstract
Dawn-dusk features of the plasmasphere are examined for intervals in February and September 1969, using electrostatic probe data ofNe andTe from the ISIS-I satellite. Clear plasmatrough formation is seen in the vicinity of 70° geomagnetic latitude in both dawn and dusk sectors in the 1500–3500 km region, but the plasmatrough is absent in the altitude range 500–1500 km. The plasmatrough minimum near 70°φ exhibits no asymmetry between dawn and dusk sectors in its latitudinal position. TheTe peak associated with the plasmatrough is more pronounced in the dawn sector. DawnNe is less than duskNe, but dawnTe exceeds duskTe. The influence of processes in the magnetosphere in causing these features is examined.
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