DETECTION OF LARGE-SCALE RADIO STRUCTURE AND PLASMA-FLOW DURING A SOLAR BRIGHT POINT FLARE

We report on the detection of a large-scale radio structure and plasma flow associated with a bright point flare observed on 1993 July 11. T he bright point (BP) flare was simultaneously imaged by the Nobeyama r adioheliograph at 17 GHz and the Soft X-Ray Telescope on board the Yoh koh mission. The microwave emission consists of a large-scale structur e and a compact moving source. The large-scale component seems to be t he radio counterpart of large-scale loop structures sometimes observed in association with BP flares in X-rays. The compact source moved fro m the location of the X-ray BP flare with a speed of about 60 km s(-1) , which suggests a plasma flow. Spatial comparison between X-ray and r adio data shows that the BP flare had different manifestations in the two wavelength domains. The emission peaks in the two wavelength domai ns did not coincide, which suggests cool plasma flow along the large-s cale radio structure. We were able to determine the temperature and em ission measure of the BP flare plasma from the X-ray data, and thus we computed the expected radio flux from the X-ray-emitting plasma. We f ound that the computed radio flux was much smaller than the total obse rved radio flux.