Abstract
Three paired type III radio bursts from metric to microwave regions observed with radio spectrometers at Yunnan and Bejing Observatories are investigated. The frequencies and heights of bidirectional electron beams are estimated. The normal and reverse drifts in the three events separate at three very different frequencies of 250, 1300 and 2900 MHz, but each within a narrow range between 4 and 100 MHz. Compact acceleration sources are indicated where originate both upward and downward moving electron beams. The magnetic structure topology, the size of the source of electron acceleration, the velocity of the electron beams and the mechanism of paired type III bursts are discussed.
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