Physics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9611363s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, July 1, 1991, p. 11,363-11,369.
Physics
10
Ionospheric Propagation, Satellite Observation, Signal Transmission, Vlf Emission Recorders, Extremely Low Frequencies, Sidebands, Transmitters
Scientific paper
Symmetric sidebands are observed in the ionosphere by the AUREOL 3 satellite when it passes at a height of 1200 km above the VLF transmitter at the Komsomolsk-on-Amur Alpha station. The sidebands are about 500 Hz off the carrier frequency of Alpha pulses. They are approximately 20 dB lower than the transmitter signal, and they appear only when ELF natural emission above the local proton gyrofrequency is observed. The data are presented and analyzed. The nonlinear coupling of the VLF transmitter signal to natural ELF emission is invoked to explain the symmetric sidebands. It is shown that the nonlinear current excited by the beats of VLF and ELF waves is strong enough to explain the sideband amplitude.
Fiala Vladimir
Lagoutte Dominique
Lefeuvre François
Mogilevskii M. M.
Sotnikov Vladimir I.
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