Physics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992adspr..12...29o&link_type=abstract
(Active experiments in space; Proceedings of the Topical Meeting of the Interdisciplinary Scientific Commission D /Meeting D3/ o
Physics
Electron Guns, International Sun Earth Explorers, Plasma Frequencies, Plasma Waves, Solar Wind, Electron Cyclotron Heating, Electron Plasma, Harmonics, Space Plasmas
Scientific paper
The ISEE-1 electron guns were operated during the final orbits of ISEE-1 in 1987 in tests designed to study the stimulation of plasma waves. The guns were operated in modes which varied from 10 micro-A, at 10 eV, to 100 micro-A at 45-eV. Experiments were run on inbound orbits, while moving from the solar wind into perigee on the dusk side. A broadband emission was generally found from 0.1-10-kHz (e.g., below the plasma frequency). Next, a strong signal was typically induced at about 80 kHz, well above the ambient plasma frequency. This is interpreted as being the plasma frequency associated with the 'beam' electrons. There were occasionally intensifications of the naturally occurring signals at the electron cyclotron frequency and the electron plasma frequency (or upper hybrid resonance).
Anderson Rachel
Mozer Forrest S.
Olsen Richard Christopher
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