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This paper deals with the penetration of a strong electromagnetic wave into a dense inhomogeneous plasma generated by electron cyclotron absorption of this wave on a magnetic beach. It was experimentally found that the plasma density increases considerably after a certain time. This increase of plasma density is due to a passage of an electromagnetic wave through an evanescent region which appears in the inhomogeneous plasma in the region where the electron density is such that omega 0 2 / omega 2 approximately=1; omega is the frequency of the wave which generates and penetrates the plasma, omega 0 is the plasma frequency. The time dependences of the reflected power, spatial electron density distribution and transmitted power demonstrate the existence of the evanescent region and show the conditions for the free passage of the electromagnetic wave through this region. The experimental results are in a good qualitative agreement with the theory.
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Musil et al. (1971) studied this question.
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