Radio and X-ray imaging observations of a continuum burst

We study a metric continuum burst observed on 1993 February 18, and its X-r ay signatures from imaging observations in radio and X-rays using the Nanca y radioheliograph and the Yohkoh Soft X-Ray Telescope (SXT). The event in q uestion was associated with weak type III bursts; these were detected at on ly one frequency (164 MHz), except for one burst (at 10:58:05 UT), which wa s observed over a broad frequency range (164-435 MHz). We believe that the early metric continuum burst is an extension of the microwave continuum whi ch was observed at frequencies as high as 5 GHz, and its onset at similar t o 10:50 UT is associated with the development of an X-ray-emitting diffuse loop system which appears to advance with a speed of similar to 50-100 km s (-1). The observed type III bursts seem to correspond to the repeated occur rence/appearance of a collimated jet emanating from the loop system that is responsible for the continuum burst. A few minutes prior to the main conti nuum onset there is a soft X-ray ejection from the main flare region. The m ain continuum has a brightness temperature greater than 10(8) K; it is unpo larized, and it shows dispersion in position with frequency and moves with speeds of similar to 50 km s(-1) at 236-410 MHz. The SXT images reveal that this initially ejected soft X-ray-emitting hot plasma seems to gradually f ill up the loop system with hot material. This hot plasma must contain enou gh energetic electrons of energy greater than several tens of keV, which ar e responsible for producing the metric continuum burst by plasma radiation mechanism.