VLF wave emissions by pulsed and dc electron beams in space. I - Spacelab 2 observations

Details VLF wave emissions by pulsed and dc electron beams in space. I - Spacelab 2 observations VLF wave emissions by pulsed and dc electron beams in space. I - Spacelab 2 observations

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....9314699r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Dec. 1, 1988, p. 14699-14718.

Physics

13

Electron Beams, Plasma Diagnostics, Plasma-Particle Interactions, Spacelab Payloads, Very Low Frequencies, Direct Current, Forbidden Transitions, Space Plasmas, Spaceborne Experiments

Scientific paper

The properties of radio waves generated by electron beams in space were investigated using data from the wideband wave receiver on the Spacelab 2. The VLF observations were found to confirm the results of the STS 3/OSS-1 mission. It was found that a 1-keV electron beam injected from the orbiter produced copious broadband electromagnetic emissions. When the electron beam was square-wave modulated, narrow-band emissions at the pulsing frequency and harmonics of that frequency were produced along with the broadband emissions. The observations indicated that dc 50-mA electron beams and pulsed 50-percent duty-cycle 100-mA beams produce broadband radiation which is comparable in intensity and spectral shape at all points for which the wave field was sampled.

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