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Evolutional Features of Solar Microwave Type IV Bursts

  • K. Kai (a1)

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Large outbursts from the Sun which are widely extended over centimetre and decimetre ranges and show smooth time variations in intensity have been called microwave type IV bursts (μ-IV). Those bursts generally consist of more than two successive components, the spectra of which move progressively towards the lower frequencies. Furthermore there is a tendency for the decay times, which are defined as the times occupied by the decreasing parts of the bursts, to become successively longer. It seems worth while to make a quantitative study of the time variation of the decay times and flux densities of μ-IV burst spectra and to infer how the physical conditions in the source change with time.

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1 Wild, J. P., J. Phys. Soc. Japan, 17, Suppl. A-II, 249 (1962).
2 Tanaka, H., and Kakinuma, T., J. Phys. Soc. Japan, 17, Suppl. A-II, 211 (1962).
3 Kai, K., Publ. Ast. Soc. Japan, 17, 309 (1965).
4 Takakura, T., and Kai, K., Publ. Ast. Soc. Japan, 18, 57 (1966).

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