Abstract
Mode conversion of p-polarized electromagnetic waves into longitudinal plasma oscillations at resonance points in cold, unmagnetized, and stratified plasmas, where a small periodic density modulation is superimposed on a linear electron density profile, is theoretically studied. The mode conversion coefficient and the magnetic field distribution are calculated in a numerically exact manner using the invariant imbedding theory of mode conversion. It is found that resonant enhancement of mode conversion, which is sometimes as high as 100%, can be achieved by tuning the incident angle, the modulation period, or the wave frequency. This phenomenon is explained as due to the formation of a standing wave near the resonance point.
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