Physics
Scientific paper
Mar 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84..882c&link_type=abstract
Journal of Geophysical Research, vol. 84, Mar. 1, 1979, p. 882-890.
Physics
4
Inhomogeneity, Monochromatic Radiation, Nonlinearity, Particle Diffusion, Radio Transmitters, Very Low Frequencies, Equatorial Electrojet, Particle Interactions, Pitch (Inclination), Quantitative Analysis, Trapped Particles, Wave Propagation
Scientific paper
It was previously shown by Raghuram et al. (1977) that a long-duration monochromatic wave generated by a high-power VLF transmitter may quench natural magnetospheric hiss emissions over a frequency range of 50-150 Hz below the transmitter frequency. In this paper, two theories to explain quiet band generation in an inhomogeneous medium are examined: the quasi-linear diffusion theory (Ashour-Abdalla, 1972; Welti et al., 1973), and the theory of nonlinear trapping and detrapping in a monochromatic wave (Roux et al., 1973; Roux and Pellat, 1976, 1978). It is shown that the former theory is not suitable for explaining the results. In contrast, a formalism similar to that of the trapping-detrapping theory allows interpretation of the variation of the frequency range with both the field intensity and the transmitter frequency. The time constants for the establishment and disappearance of the quiet band are qualitatively interpreted.
Cornilleau-Wehrlin Nicole
Gendrin Roger
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