Physics
Scientific paper
Jan 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93..162r&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Jan. 1, 1988, p. 162-174.
Physics
15
Beam Injection, Electron Beams, Electron Guns, Geosynchronous Orbits, Plasma Waves, Square Waves, Upper Atmosphere, Electric Fields, Electromagnetic Radiation, Plasma Jets, Space Shuttles, Vacuum Chambers, Very Low Frequencies
Scientific paper
Among the investigations conducted on the Space Shuttle flight STS-3 of March 1982 was an experiment in which a 1-keV, 100-mA electron gun was pulsed at 3.25 and 4.87 kHz. The resultant waves were measured with a broadband plasma wave receiver. At the time of flight the experimental setup was unique in that the electron beam was square wave modulated and that the Shuttle offered relatively long times for in situ measurements of the ionospheric plasma response to the VLF pulsing sequences. In addition to electromagnetic response at the pulsing frequencies the wave exhibited various spectral harmonics as well as the unexpected occurrence of 'satellite lines' around those harmonics. Both phenomena occurred with a variety of different characteristics for different pulsing sequences.
Banks Peter M.
Bush Rock I.
Frazer-Smith A. C.
Neubert Torsten
Reeves Geoff D.
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