EXOS-B/Siple station VLF wave-particle interaction experiments. II - Transmitter signals and associated emissions

Details EXOS-B/Siple station VLF wave-particle interaction experiments. II - Transmitter signals and associated emissions EXOS-B/Siple station VLF wave-particle interaction experiments. II - Transmitter signals and associated emissions

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88..295b&link_type=abstract

Journal of Geophysical Research, vol. 88, Jan. 1, 1983, p. 295-309.

Physics

18

Earth Magnetosphere, Exos-B Satellite, Particle Interactions, Satellite Observation, Vlf Emission Recorders, Wave Interaction, Whistlers, Energetic Particles, Japanese Spacecraft, Propagation Modes, Signal Reception, Signal Transmission, Transmitters

Scientific paper

New observations in the magnetosphere of coherent VLF waves from the Siple Station, Antarctica, transmitter and associated VLF emissions triggered by the transmitter signals are reported. The data analyzed were acquired on the EXOS-B high-altitude satellite during the period July 15-September 7, 1979, during joint VLF wave-injection experiments involving scientists from Kyoto, Tokyo, and Stanford universities. The experiments were carried out to gain a deeper understanding of the interactions between coherent VLF waves and energetic particles in the magnetosphere, in particular, the whistler-mode instability through which both natural and stimulated VLF emissions are produced. Analysis of the emission-triggering events provides strong evidence that the triggering took place inside whistler-mode ducts and that the emissions reached the satellite only after being scattered at one end of the ducts by ionospheric irregularities. It is concluded that in the noon sector of the magnetosphere, the amplitude of nonducted signals from the Siple transmitter is generally less than the threshold level necessary for triggering in the nonducted mode.

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