Abstract

The outstanding bursts of radio emission from the sun, which are termed spectral type II or “slow-drift” bursts, are a rare phenomenon. Even at sunspot maximum the average rate of occurrence is only about one burst every 50 hours, so that a long series of observations is needed to define the characteristics of the bursts. The present study uses the records made over the past 5½ years with the 40 to 240 Mc/s Dapto radio spectrograph. During this period, 65 bursts of this type were recorded.

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