An electromagnetic wave is transformed in a remarkable way by a time-varying magnetoplasma medium. The main effect of the temporal change in the parameters of the medium is the splitting of a source wave into new waves whose frequencies are different from the source wave frequency. Several problems involving either slowâfast creation or slowâfast collapse of the plasma medium in the presence of a static magnetic field are discussed. The more important results are (i) frequency upshifting with power intensification of a whistler wave by a collapsing plasma medium, and (ii) conversion of a whistler wave into a controllable helical wiggler magnetic field. A switched magnetoplasma medium can act like a frequency transformer.
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