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During the Spacelab-2 mission of July, 1985, electron beams (1keV, 50-150mA) pulsed at ELF and VLF frequencies were emitted from the Space Shuttle Orbiter. The wave fields generated by the beam were monitored by a Plasma Diagnostics Package (PDP), which was released as a free-flying sub-satellite during a six hour period. Measurements of the Orbiter potential and the return current during beam emissions were obtained from a Charge and Current Probe (CCP) mounted in the payload bay. Results from the PDP and CCP are presented.
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Neubert et al. (1988) studied this question.
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