Six metric type Ⅲ burstswith bidirectional frequency drifts observed with theAcousto-Optic Spectrograph at the Yunnan Observatory during the 22nd solar cycle are analysed in the present article. These events respectively reveal that the demarcation frequencies between the positive and negative drift bursts are in between 244 MHz and 272 MHz. The radiation mechanism of the type Ⅲ drift pair events is also discussed from the observation characteristics.
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