ELF oscillations associated with electron beam injections from the Space Shuttle

Details ELF oscillations associated with electron beam injections from the Space Shuttle ELF oscillations associated with electron beam injections from the Space Shuttle

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....9212451c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Nov. 1, 1987, p. 12451-12457. Sponsorship: Statens Naturvidenskabelig

Physics

15

Beam Injection, Electron Beams, Space Plasmas, Spaceborne Experiments, Electrostatic Probes, Extremely Low Frequencies, Oscillations, Particle Accelerators, Power Spectra, Sepac (Payload)

Scientific paper

ELF 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.

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