Abstract
The parametric effect of electromagnetically induced transparency (EIT) is studied in the case of quasi-transverse propagation of an extraordinary wave in the vicinity of the upper hybrid resonance in a cold plasma. The question is investigated of whether the waves that propagate in a smoothly inhomogeneous medium (from the transparency region in the vicinity of the upper hybrid resonance into vacuum or in the opposite direction) can reach the EIT region. The features of the quasi-transverse propagation of an extraordinary wave at the electron cyclotron resonance frequency in the quasi-EIT regime are also considered. It is shown that, in this situation, the parametric effects modify the polarization of the wave, with the result that its absorption increases substantially (by one to two orders of magnitude).
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