Computer Science – Sound
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88..282k&link_type=abstract
Journal of Geophysical Research, vol. 88, Jan. 1, 1983, p. 282-294. Research supported by the Japan Society for the Promotion o
Computer Science
Sound
20
Earth Magnetosphere, Exos-B Satellite, Plasma-Particle Interactions, Radio Transmission, Space Plasmas, Very Low Frequencies, Anisotropy, Electrons, Exos Sounding Rocket, Ground Stations, Pitch (Inclination), Whistlers
Scientific paper
The EXOS-B/Siple Station joint experiment on the triggering of VLF emissions by man-made signals causing some form of wave-particle interactions in the magnetosphere is presented, and results concerning wave-particle correlations are reported. In situ measurements of both energetic electron flux and VLF waves were made near the meridian connecting Siple Station, Antarctica with Roberval, Quebec, Canada in campaigns during July through September, 1979 and December 1979 through January 1980 at times of VLF transmission from Siple. Strong observed signals were found to be well correlated with a pancake pitch angle distribution of 0.3 to 6.9-keV electrons, and to exhibit a positive linear growth rate. Artificially stimulated emissions were observed to be accompanied by large electron fluxes in all energy channels in the equatorial interaction region, although the measured pitch angle distribution was not highly anisotropic. Results may be interpreted by the amplification of Siple signals by the cyclotron instability due to high pitch angle anisotropy (pancake distribution) and the triggering of emissions in the presence of high electron fluxes with some anisotropy and a sufficiently strong signal.
Bell Timothy F.
Hashimoto Katsumi
Helliwell Robert A.
Inan Umran S.
Katsufrakis J. P.
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