Spectral broadening of VLF radio signals traversing the ionosphere

Details Spectral broadening of VLF radio signals traversing the ionosphere Spectral broadening of VLF radio signals traversing the ionosphere

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....9314683g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Dec. 1, 1988, p. 14683-14687.

Physics

24

Atmospheric Attenuation, Ionospheric Propagation, Spectral Resolution, Very Low Frequencies, Bandwidth, Cyclotron Radiation, Satellite Communication, Whistlers

Scientific paper

Two different source mechanisms that can cause the spectral broadening of VLF radio signals traversing the ionosphere, a phenomenon first observed by Bell et al. (1983), are proposed. The first is a nonlinear scattering of the whistler-mode VLF signals by preexisting ionospheric density fluctuations that render a mode conversion to lower hybrid waves. In the absence of ionospheric irregularities, a second mechanism, that involves a parametric instability, can excite the lower hybrid waves, as was proposed by Lee and Kuo (1984). Since both types of spectra were recorded in experiments, it is concluded that the two suggested source mechanisms contribute additively to the observed spectral broadening of injected VLF waves.

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