ELF oscillations associated with electron beam injections from the space shuttle

Journal Article · Sun Nov 01 04:00:00 UTC 1987 · Journal of Geophysical Research; (United States)

DOI:https://doi.org/10.1029/JA092iA11p12451· OSTI ID:5961991

Cai, D; Neubert, T; Storey, L R.O.; Banks, P M ^[1]; Sasaki, S ^[2]; Abe, K ^[3]; Burch, J L ^[4]

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1. Stanford Univ., CA (United States)
2. Inst. of Space and Astronautical Science, Tokyo (Japan)
3. Univ. of Tokyo, (Japan)
4. South West Research Inst., San Antonio, TX (United States)

ELF oscillations (f < 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 VLF (1 kHz < f < 10 kHz) wave stimulation monitored by a wave receiver during one particular beam sequence has already been reported by Neubert et al. (1986). The amplitudes of the ELF and VLF oscillations observed during this sequence have almost identical variations with beam pitch angle, the strongest emissions begin observed for parallel beams; the ELF power spectra for the strongest emissions have peaks about 10 dB above the broadband ELF noise at frequencies aroudn 50-60 Hz. In another beam sequence the power spectra had a harmonic structure with the fundamental frequency around 200 Hz. 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. The authors find it 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. The observations suggest that the plasma cloud has a particle lifetime at least of the order of 100 ms.

• OSTI ID: 5961991
• Journal Information: Journal of Geophysical Research; (United States), Journal Name: Journal of Geophysical Research; (United States) Vol. 92:A11; ISSN 0148-0227; ISSN JGREA
• Country of Publication: United States
• Language: English

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661320* -- Auroral
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&amp; Magnetospheric Phenomena-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AIRCRAFT
AMPLITUDES
BEAM CURRENTS
BEAM INJECTION
BEAMS
CHARGE COLLECTION
CURRENTS
EARTH ATMOSPHERE
ELECTRIC POTENTIAL
ELECTRIC PROBES
ELECTROMAGNETIC RADIATION
ELECTRON BEAMS
FLUCTUATIONS
IONOSPHERE
LANGMUIR PROBE
LEPTON BEAMS
LIFETIME
OSCILLATIONS
PARTICLE BEAMS
PLANETARY IONOSPHERES
PROBES
RADIATIONS
SPACE SHUTTLES
SPACE VEHICLES
VARIATIONS
VEHICLES