Abstract
IT has been, recognized for some time that Type II solar radio bursts are due to the excitation of plasma oscillations in the solar corona by some exciting agency which moves through the corona. Roberts1, in reviewing observations and theories of these phenomena, leaves unexplained two salient characteristics: (1) the appearance of radiation at the fundamental and second harmonic at comparable powers and the lack of radiation at all higher harmonics; (2) the frequent splitting of each of these two ‘lines’ into a pair of lines, the fractional splitting of each of these two pairs being the same, typically a few per cent.
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References
Roberts, J. A., Austral. J. Phys., 12, 327 (1959).
Sturrock, P. A., J. Nuclear Energy, C, 2, 158 (1961).
Sturrock, P. A., “Generation of Radio Noise in the Vicinity of the Earth”. Paper presented at U.R.S.I. Conf., Washington (May, 1961).
Wild, J. P., Murray, J. D., and Rowe, W. C., Austral J. Phys., 7, 439 (1954).
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STURROCK, P. Spectral Characteristics of Type II Solar Radio Bursts. Nature 192, 58 (1961). https://doi.org/10.1038/192058a0
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DOI: https://doi.org/10.1038/192058a0
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