X-RAY AND RADIO STUDIES OF A CORONAL ERUPTION - SHOCK-WAVE, PLASMOID,AND CORONAL MASS EJECTION

On 1994 July 31, a fast (900 km s(-1)) eruptive structure was observed in X-rays, followed by a slower plasmoid (180 km s(-1)). They were as sociated with a coronal mass ejection, prominence eruption, and a host of metric radio bursts, The X-ray structure seems to be a part of a w hite light coronal mass ejections (CME), as inferred from the white li ght images of July 30 and 31. A type II burst was observed at the lead ing edge of the X-ray eruption, while a type IV burst was spatially as sociated with the detached plasmoid. The type III radio bursts occurre d on thin overdense structures associated with the eruption, We detect ed the rise of plasma levels because of mass addition to the type III burst sources as a result of the eruption. This event further clarifie s the manifestation of a CME in X-rays. We identify the X-ray eruption as the driver of the coronal shock wave. This provides answer to the long-standing question regarding the origin of coronal and interplanet ary shock waves. We have also found evidence to support the idea that herringbone bursts are produced when the coronal shock wave crosses op en magnetic field lines.