It was recently suggested that the phenomenon Dawn may be due to Doppler-shifted radiation from protons rotating about the lines of force of the earth's magnetic field. This suggestion was investigated and a theoretical chorus dispersion was found to compare favorably with an audio spectrogram of the chorus. Chorus was observed usually in a frequency range 1 to 4 kc although it was observed below 1 kc and above 10 kc occasionally. (B.O.G.)
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Murcray et al. (1960) studied this question.