Nonlinear wave‐wave interaction between signals from a ground‐based VLF transmitter and narrow‐band ELF emissions in the subauroral ionosphere is studied by means of the bispectrum and bicoherence analysis. A bicoherence analysis has indicated that the sideband structures around the Siple transmitter signal received onbord the ISIS satellite are due to the nonlinear interaction between the Siple VLF signal and the pre‐existing ELF emission.
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Ohnami et al. (1993) studied this question.
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