THERMAL AND NONTHERMAL FLARE EMISSION OBSERVED WITH THE NOBEYAMA RADIO HELIOGRAPHY

The early phases of three flares, observed by the Nobeyama Radio Helio graph, are studied. Nonthermal and thermal radio sources are identifie d by comparison with soft X-ray images taken by the Soft X-ray Telesco pe onboard the Yohkoh satellite. Two of the flares are mainly of nonth ermal origin and their location coincides with one of the footpoints o f soft X-ray loops. Another flare has both thermal and nonthermal comp onents which start to brighten simultaneously. This suggests that part icle acceleration and plasma compression develop simultaneously.