It is well known that refraction, Faraday rotation, scintillation and absorption of microwaves take place when a microwave passes through an ionospheric plasma. However, when the amplitude of the microwave is large, nonlinear interactions occur with plasma in addition to these plasma interactions with a small signal microwave. Various phenomena not conceivable for weak microwaves used in communication can take place. Especially, it is predicted that the three‐wave resonance, which is the most fundame…
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