The intensity ratio of the second- to the third-harmonic cyclotron emission, measured by a scanning Fourier-transform spectrometer, is investigated for a wide range of discharge parameters. Dependences of the ratio on electron temperature and density are described by the model of plane-parallel walls. The time evolution of central electron density deduced from the ratio is consistent with multichannel CO₂ interferometer data within the estimated experimental error.
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Yamamoto et al. (1985) studied this question.