Drifting radio bursts and fine structures in the 0.8-7.6 GHz frequency range observed in the NOAA 9077 AR (July 10-14, 2000) solar flares

The 0.8-7.6 GHz global and detailed radio spectra of the four most intense flares observed in the NOAA 9077 active region (July 10-14, 2000) are prese nted. The radio bursts of these flares and their sequence reveal features i ndicative of topological similarities among the flares under study. The dri fting pulsation structures mere found to be the typical signatures of these flares. Furthermore many other fine structures such as narrowband drifting lines, drifting harmonic structure with zebra patterns, drifting branches of narrowband dm-spikes, and structures with fast positively and negatively drifting bursts are shown in the contest of the whole radio flares. Same o f them were observed for the first time. The relationships among them and t he resulting interpretations ale summarized. The characteristic periods of the drifting pulsation structures and the magnetic field in the zebra radio source are determined.