A nonlinear mechanism is considered for the penetration of a transverse electromagnetic field into plasma with E=1- omega 0 2 <0 and T e >>T i . It is shown that the modulated finite amplitude electromagnetic wave produces plasma density fluctuations which form an electro-acoustic wave and transmits the electromagnetic field into the plasma with a velocity of the order of that ion sound. A theory describing the formation and evolution of the electroacoustic waves is developed.
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V. I. Karpman (1971) studied this question.
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