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A major radio event, associated with an X7.1/2B flare in AR720 and a fast CMEwas observed on January 20, 2005 with the radio-spectrograph ARTEMIS-IV; it wasparticularly intense and with a complex radio signature with rich finestructure which was recorded in the 270-420 MHz range at high resolution (100samples/sec). The fine structure is compared with similar results in thedecimetric and microwave frequency range. It was found to approximately matchthe comprehensive Ondrejov Classification in the spectral range 0.8-2 GHz.

Metric Radio Bursts and Fine Structures Observed on January 20, 2005