Spectral broadening of VLF transmitter signals and sideband structure observed on Aureol 3 satellite at middle latitudes

Journal Article · Wed Jul 01 04:00:00 EDT 1987 · Journal of Geophysical Research; (United States)

DOI:https://doi.org/10.1029/JA092iA07p07551· OSTI ID:5557116

Tanaka, Y; Hayakawa, M ^[1]; Lagoutte, D; Lefeuvre, F ^[2]; Tajima, S ^[3]

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1. Nagoya Univ., Aichi (Japan)
2. Centre National de la Recherche Scientifique, Orleans (France)
3. Nagoya Univ., Aichi (Japan) Nippon Gakki Company Ltd., Hamamatsu (Japan)

Electric and magnetic field wave data acquired on Aureol 3 satellite demonstrate the existence of a spectral broadening effect in which VLF transmitter signals from Alpha station (geographic coordinates, 50.5{degree}N, 137{degree}E) in USSR undergo a significant spectral broadening on electric fields as they propagate through the ionosphere up to the spacecraft in the altitude range of 500-2,000 km at middle latitudes (L {approximately} 2). The spectral broadening phenomena may be divided into two types: (1) spectrally broadened components occurring without any association with ELF/VLF emissions under disturbed ionospheric conditions and (2) spectrally broadened components with predominant sideband structure in association with ELF emissions. Bicoherence computation results suggest a nonlinear mode coupling between the transmitter signal and ELF emission which produces sidebands that are quasi-electrostatic in nature. However, faint spectral broadened components in both types 1 and 2 may be connected with Doppler shift of quasi-electrostatic whistler mode waves with a broad spectrum of k near the resonance cone, due to scattering of the transmitter signals from ionospheric irregularities in the F region.

• OSTI ID: 5557116
• Journal Information: Journal of Geophysical Research; (United States), Journal Name: Journal of Geophysical Research; (United States) Vol. 92:A7; ISSN 0148-0227; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

661320* -- Auroral
Ionospheric
& Magnetospheric Phenomena-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ASIA
DEVELOPED COUNTRIES
DOPPLER EFFECT
EARTH ATMOSPHERE
ELECTRIC FIELDS
ELECTROMAGNETIC RADIATION
EUROPE
F REGION
IONOSPHERE
LINE BROADENING
NONLINEAR PROBLEMS
PLANETARY IONOSPHERES
PLASMA DENSITY
RADIATIONS
RADIOWAVE RADIATION
SATELLITES
SIGNALS
USSR
WAVE PROPAGATION