Radio and white-light coronal signatures associated with the RHESSI hard X-ray event of 2002 July 23

M. J. Reiner, S. Krucker, Dale Gary, B. L. Dougherty, M. L. Kaiser, J. L. Bougeret

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13 Scopus citations

Abstract

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 intensitytime 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.

Original languageEnglish (US)
Pages (from-to)1107-1116
Number of pages10
JournalAstrophysical Journal
Volume657
Issue number2 I
DOIs
StatePublished - Mar 10 2007

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Solar-terrestrial relations
  • Sun: X-rays, gamma rays
  • Sun: activity
  • Sun: corona
  • Sun: flares
  • Sun: radio radiation

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