Physics
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....9111321n&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Oct. 1, 1986, p. 11321-11329. Sponsorship: Statens Naturvidenskabelig
Physics
29
Electron Beams, Electron Emission, Sepac (Payload), Space Shuttle Missions, Spacelab Payloads, Wave Generation, High Frequencies, Radiation Effects, Spaceborne Experiments, Spectral Bands, Very Low Frequencies
Scientific paper
Observations from the SEPAC (Space Experiments with Particle Accelerators) experiment on Spacelab 1 Shuttle mission of waves generated during electron beam emissions are presented. The dependence of the wave intensity on the beam parameters and the Shuttle attitude is outlined, and the shape of the wave spectra are discussed. It is found that the noise in the 0.75- to 10 kHz band has a spectral shape that can be characterized by an f exp -n law, and that the VLF signal level depends on the beam angle to the magnetic field, the strongest emissions being observed for parallel beams. These features are found to be consistent with a drift wave instability.
Kawashima Naoki
Neubert Torsten
Reasoner David L.
Roberts William T.
Storey R. O. L.
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