Abstract
WILD and co-workers1 have reported observing a fundamental and its second harmonic in the radio spectrum of some solar disturbances. Three characteristic features of the observations are: (i) the frequency bands drift towards the lower frequencies with time; (ii) the received intensities of the fundamental and second harmonic are similar; (iii) the harmonic peak usually occurs at slightly less than twice the frequency of the fundamental peak.
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Wild, J. P., Murray, J. D., and Rowe, W. C., Nature, 172, 533 (1953). Wild, J. P., Roberts, J. A., and Murray, J. D., Nature, 173, 532 (1954). Wild, J. P., Murray, J. D., and Rowe, W. C., Aust. J. Phys. (in the press).
Akhiezer, A. I., and Lubarskii, G. Y., C.R. Acad. Sci., U.S.S.R., 80, 193 (1951).
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SMERD, S. Non-Linear Plasma Oscillations and Bursts of Solar Radio Emission. Nature 175, 297 (1955). https://doi.org/10.1038/175297a0
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DOI: https://doi.org/10.1038/175297a0
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