The report describes the first observations of coherent emission from the upper hybrid resonance of a magnetoplasma, and the measurement of the frequency of this resonance as a function of electron density. The technique reported constitutes a new and useful means for the study of collective phenomena in magnetoplasmas and may also serve as an accurate means for the direct measurement of electron density in such plasmas. (Author)
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Hill et al. (1967) studied this question.
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