Physics
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.6745k&link_type=abstract
Journal of Geophysical Research, vol. 86, Aug. 1, 1981, p. 6745-6754.
Physics
48
Dawn Chorus, Earth Magnetosphere, Extremely Low Frequencies, Hiss, Satellite-Borne Instruments, Cyclotron Resonance, Electron Energy, Geomagnetism, Jupiter Atmosphere, Noise Spectra, Pitch (Inclination), Plasma-Electromagnetic Interaction, Scatha Satellite
Scientific paper
In SCATHA satellite data, chorus emissions have been observed to start at frequencies within a hiss band whose spectra, averaged for 6.4 sec with a resolution of 5 Hz, are very smooth. It is suggested that electrons in a narrow range of energies and pitch angles can be organized in phase by the Doppler-shifted cyclotron resonance with the larger-amplitude spectral components in the hiss band, where the cyclotron resonance bandwidth is sufficiently narrow for the electrons not to be dephased by waves in adjacent portions of the highly structured spectrum. The chorus emission is then generated as the phase-bunched electrons move adiabatically along the geomagnetic field line. It is argued that this mechanism can also account for the chorus emissions detected at frequencies above a hiss band in the Jovian magnetosphere.
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