RADIO-CONTINUUM AND TYPE-III BURSTS ASSOCIATED WITH CORONAL X-RAY STRUCTURES

In this paper, we report the detection of a metric continuum burst sou rce at the top of a coronal loop observed in soft X-rays. The continuu m burst was probably a flare continuum that lasted more than 1 hr. Thi s is the first observation of such metric continuum emission produced by energetic electrons with high-spatial resolution imaging instrument s in both X-rays and radio. The nonthermal radio emission appears to b e associated with the rupture of a part of the loop top and the ejecti on of soft X-ray plasma at the top of the coronal loop. We have also i dentified X-ray coronal structures in which type III emitting electron beams propagate. The metric continuum is most likely caused by second -harmonic plasma emission, and the electron density in the soft X-ray structure where type IIIs are observed is close to the critical plasma density derived from radio observations.