Theoretical analysis of nonlinear interaction of intense electromagnetic wave and plasma waves in the ionosphere

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 fundamental nonlinear wave-wave interaction, can be applied to the nonlinear wave-wave interaction between the plasma and a large signal microwave. In this paper, the generating condition of the electrostatic plasma wave phenomena excitated in the plasma medium by a large signal electromagnetic wave is theoretically investigated and the nonlinear coupling coefficient between the large signal electromagnetic wave and the electrostatic plasma wave is derived.