Abstract
Two examples of pairs of ‘J-shaped’ type III bursts with 2∶3 frequency ratio are given. It is suggested that these could be the second and the third harmonics of undetected fundamental radiation. The 80 MHz heliograph source of the third harmonic showed an apparent brightness temperature of 109.6K, while the order of 1016K seems to be required theoretically. This may imply that the apparent radio source was composed of many unresolved small sources of much higher brightness temperature.
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On leave from the Department of Astronomy, University of Tokyo, Tokyo, Japan.
On leave from the Department of Astronomy, Cairo University, Cairo, Egypt.
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Takakura, T., Yousef, S. The third harmonic of type III solar radio bursts. Sol Phys 36, 451–458 (1974). https://doi.org/10.1007/BF00151214
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DOI: https://doi.org/10.1007/BF00151214