An S3-3 search for confined regions of large parallel electric fields

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Atmospheric Electricity, Auroral Zones, Earth Magnetosphere, Electric Fields, Satellite Observation, Computerized Simulation, Data Acquisition, Electromagnetic Measurement, Explorer 12 Satellite, Plasma Layers, Shock Wave Interaction

Scientific paper

S3-3 satellite passes through several hundred perpendicular shocks are searched for evidence of large, mostly parallel electric fields (several hundred millivolts per meter, total potential of several kilo-volts) in the auroral zone magnetosphere at altitudes of several thousand kilometers. The actual search criteria are that one or more E-field data points have a parallel component E sub z greater than 350 mV/m in general, or 100 mV/m for data within 10 seconds of a perpendicular shock, since double layers might be likely, in such regions. Only a few marginally convincing examples of the electric fields are found, none of which fits a double layer model well. From statistics done with the most unbiased part of the data set, upper limits are obtained on the number and size of double layers occurring in the auroral zone magnetosphere, and it is concluded that the double layers most probably cannot be responsible for the production of diffuse aurora or inverted-V events.

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