Abstract
The theoretical performance and accuracy of the Wilson type of electron temperature probe are discussed. Results from two ionospheric flights of this equipment are given, one being the first test of a modified version of the probe allowing detection and measurement of changes in the work functions of the electrodes. The relatively high levels of contamination that were observed were also found to vary markedly during flight, in a manner suggesting that smouldering rocket motors were partly responsible. An unexpected transient behavior of the probe was reproduced in laboratory tests that indicated that ion sheaths were playing an important role.
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