On the suppression of wave growth and triggering in VLF multi-wave experiments

Physics

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Particle Interactions, Vlf Emission Recorders, Wave Propagation, Whistlers, Critical Frequencies, Earth Magnetosphere, Electrons, Monochromatic Radiation, Plasmasphere, Propagation Modes, Wave Attenuation

Scientific paper

The physical mechanisms underlying the suppression of wave growth and triggering in a system of two whistler waves are investigated theoretically. A numerical model is developed to determine the critical frequency spacing associated with unsymmetrical interaction effects, and a comparison was made with the known critical frequency spacing associated with mutual interaction effects. For the range of frequencies corresponding to whistler mode ducted propagation in the magnetosphere near L = 4, it is shown that the unsymmetrical effect may dominate the mutual effect above critical amplitude levels and within the range of wave amplitudes from about 1 to 10 pT. The model estimates of critical frequency separations are found to agree with those reported by Heliwell (1983) for the frequency range 3-4 kHz, where detected unsymmetrical effects seem to extend to separations larger than 200 Hz.

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