New results of stimulated electromagnetic emissions (SEE) from the HIPAS Observatory are reported. A novel hf heating sequence was used to first precondition the ionosphere, and SEE was then excited with low-amplitude test pulses. Through this approach, the nonlinear physics of SEE was studied. The correlation between small-scale field-aligned density striations and SEE generation was demonstrated, and SEE was excited at power density of 24 dB less than normally required. The results compare well with theoretical predictions of SEE generation via trapped upper hybrid oscillations decay and cavitation within striations.
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Cheung et al. (1998) studied this question.
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