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

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

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...657.1107r&link_type=abstract

The Astrophysical Journal, Volume 657, Issue 2, pp. 1107-1116.

Astronomy and Astrophysics

Astronomy

13

Sun: Activity, Sun: Corona, Sun: Flares, Sun: Radio Radiation- Sun: X-Rays, Gamma Rays, Sun: Solar-Terrestrial Relations

Scientific paper

Simultaneous radio, white-light, and hard X-ray (HXR) observations for the 2002 July 23 γ-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 III-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.

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