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ELF oscillations associated with electron beam injections from the Space ShuttleELF oscillations (f less than 500 Hz) were observed during the electron beam emissions of the space experiments with particle accelerators (SEPAC) flown on the Spacelab 1 Shuttle mission. The beams had energies up to 5 keV and currents up to 300 mA, and the oscillations were present in the data from a Langmuir probe, a floating probe, an electron energy analyzer, and a photometer. The power density and frequency of the fundamental increased with the Shuttle charge-up potential. The emission level observed during the beam sequences increased with the charge-up potential of the Orbiter, which largely depended on the wake structure. It is most likely that the ELF oscillations are expressions of fluctuations in the return current and the Shuttle potential and that these fluctuations are caused by processes involving charge imbalances in the near environment of the Shuttle, possibly in a comoving plasma cloud.
Document ID
19880033138
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Cai, D.
(Stanford Univ. CA, United States)
Neubert, T.
(Stanford Univ. CA, United States)
Storey, L. R. O.
(Stanford Univ. CA, United States)
Banks, P. M.
(Stanford University CA, United States)
Sasaki, S.
(Tokyo, University Japan)
Date Acquired
August 13, 2013
Publication Date
November 1, 1987
Publication Information
Publication: Journal of Geophysical Research
Volume: 92
ISSN: 0148-0227
Subject Category
Plasma Physics
Accession Number
88A20365
Funding Number(s)
CONTRACT_GRANT: NAS8-35350
CONTRACT_GRANT: NAS8-32488
CONTRACT_GRANT: SNFO-11-4839
Distribution Limits
Public
Copyright
Other

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