A statistical study of high-altitude electric fields measured on the Viking satellite

Physics

Scientific paper

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Auroras, Electric Fields, Polar Caps, Satellite Observation, Statistical Analysis, Viking Spacecraft, Plasma Density, Spacecraft Charging, Temporal Distribution, Vertical Distribution

Scientific paper

Characteristics of high-altitude data from the Viking electric field instrument are presented in a statistically study based on 109 Viking orbits. The study is focused in particular on the signatures of and relationships between various parameters measured by the electric field instrument, such as the parallel and transverse (to B) components of the electric field, the satellite potential, and the electric field variability. A major goal of the Viking mission was to investigate the occurrence and properties of parallel electric fields and their role in the auroral acceleration process. The results in this paper on the altitude distribution of the electric field variability confirm earlier findings on the distribution of small-scale electric fields and indicate the presence of parallel fields up to about 11,000 km altitude. The directly measured parallel electric field is also investigated in some detail. It is in general directed upward with an average value of 1 mV/m, but depends on, for example, altitude and plasma density. Possible sources of error in the measurement of the parallel field are also considered and accounted for.

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