Abstract
IT is known theoretically, from the Appleton–Hartree equation1, that propagation through a plasma of a plane electromagnetic wave, having a frequency below the critical frequency of the plasma, is possible in the presence of a steady magnetic field applied parallel to the direction of propagation, but only if this field is strong enough to cause an electron cyclotron frequency which exceeds the propagated frequency. Propagation of a microwave signal in such a high-density magnetized plasma was observed by Gallet et al.2
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References
Ratcliffe, J. A., The Magneto-Ionic Theory and its Application to the Ionosphere (Camb. Univ. Press, 1959).
Gallet, R., et al., Phys. Rev. Letters, 4, 347 (1960).
Storey, L. R. O., Phil. Trans. Roy. Soc., A, 246, 113 (1953).
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DELLIS, A., WEAVER, J. Measurement of a High Refractive Index for Transmission of 3-cm. Microwaves through a Plasma. Nature 193, 1274–1275 (1962). https://doi.org/10.1038/1931274a0
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DOI: https://doi.org/10.1038/1931274a0
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