Abstract
Microbursts are low brightness temperature burst observed by the Clark Lake radioheliograph. The bursts are seen at the observing frequencies from 30 MHz to 70 MHz, are stationary at a given frequency, and have short rise times and durations of 2 – 10 seconds. We present observations of the bursts, and show that their properties imply that they are weak type III bursts. However, we also show that none of the theories invoked to explain strong type III bursts can accomodate such weak bursts. We expect that important differences in the properties of microbursts and the stronger type III's will be found, and will be important in understanding the propagation of electron streams in the corona.
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