Radio and White‐Light Coronal Signatures Associated with the RHESSI Hard X‐Ray Event of 2002 July 23

Abstract

Simultaneous radio, white-light, and hard X-ray (HXR) observations forthe 2002 July 23 γ-ray flare event are used to establish therelationship of a complex type III-like burst to the correspondingcoronal mass ejection (CME) and the coronal electron accelerationsignatures observed in the decimeter/microwave (dm-cm) emissions andX-rays. We find that the onset of the type III-like emissions for thisevent is coincident with the impulsive RHESSI HXR event, the dm-cm radioemissions and with the linearly extrapolated liftoff time of the CME.The overall intensity-time characteristics of the complex type III-likeburst resembles that of both the dm-cm flux and the HXR light curve thatcorrespond to an electron acceleration event deep in the corona.Furthermore, the complex radiation characteristics of the type III-likeemissions are found to be directly related to the CME kinematics, whichis directly related to the frequency drift of the associatedlow-frequency (kilometric) type II emissions. The frequency-driftcharacteristics of the high-frequency (metric) type II emissionsobserved for this event, on the other hand, are not clearly related tothe kilometric type II emissions and therefore to the observed CMEheight-time characteristics, indicating that these emissions maycorrespond to an independent coronal shock wave.