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Winningham & Gurgiolo 1982
Winningham, J.D. and Gurgiolo, C. (1982). DE-2 photoelectron measurements consistent with a large scale parallel electric field over the polar cap. Geophysical Research Letters 9: doi: 10.1029/GL009i009p00977. issn: 0094-8276.

Winningham and Heikkila (1974) presented observations of ''anomalous'' photoelectron angular distributions over the polar caps. They interpreted these observations to be indicative of a large scale, outwardly directed, parallel electric field over the polar cap. The parallel field was observed to be spatially and/or temporally variable. New results from DE confirm and elaborate on these results. Some of the problems of data from a spinning spacecraft and low temporal/spatial resolution are alleviated. We reach the same conclusion concerning the possible existance of a large-scale, low-voltage parallel field and suggest causes for this field.

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Geophysical Research Letters
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American Geophysical Union
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