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

• Published in: The Astrophysical journal 2007-03, Vol.657 (2), p.1107-1116
• Main Authors: Reiner, M. J, Krucker, S, Gary, D. E, Dougherty, B. L, Kaiser, M. L, Bougeret, J.-L
• Format: Article
• Language: English
• Subjects: Astronomy; Astrophysics; Earth, ocean, space; Exact sciences and technology; Physics
• ISSN: 0004-637X; 1538-4357
• DOI: 10.1086/510827

Simultaneous radio, white-light, and hard X-ray (HXR) observations for the 2002 July 23 g-ray flare event are used to establish the relationship of a complex type III-like burst to the corresponding coronal mass ejection (CME) and the coronal electron acceleration signatures observed in the decimeter/microwave (dm-cm) emissions and X-rays. We find that the onset of the type IH-like emissions for this event is coincident with the impulsive RHESSI HXR event, the dm-cm radio emissions and with the linearly extrapolated liftoff time of the CME. The overall intensity-time characteristics of the complex type III-like burst resembles that of both the dm-cm flux and the HXR light curve that correspond to an electron acceleration event deep in the corona. Furthermore, the complex radiation characteristics of the type III-like emissions are found to be directly related to the CME kinematics, which is directly related to the frequency drift of the associated low-frequency (kilometric) type II emissions. The frequency-drift characteristics of the high-frequency (metric) type II emissions observed for this event, on the other hand, are not clearly related to the kilometric type II emissions and therefore to the observed CME height-time characteristics, indicating that these emissions may correspond to an independent coronal shock wave.