Earth, Moon, and Planets

, Volume 104, Issue 1–4, pp 105–108 | Cite as

Origin of the Multiple Metric Type II Radio Burst Structure Associated with the 2002 July 23 CME

  • Salvatore Mancuso
  • Davide Avetta


We report on the analysis of a fast (>2,000 km/s) CME-driven shock event observed with the UVCS telescope operating aboard SoHO on 23 July 2002. The same shock was also detected in the metric band by several ground-based radiospectrographs. The peculiarity of this event is the presence in the radio spectra of two intense metric type II bursts features drifting at different rates, together with clear shock/related broadenings of the O VI doublet lines observed by UVCS that were found to be temporally associated with the above radio features. The nature of these multiple radio lanes in the metric band is still under debate. One possible explanation is that they are produced by multiple shock waves generated by different ejections or, alternatively, by the flare and the associated CME. Also, emission from the upstream and downstream shock regions can produce split bands. By adopting a plausible CME model, together with a detailed analysis of the white-light, UV, and radio data associated with this event, we are able to conclude that both the radio and the UV shock signatures were produced by a single shock wave surface generated by the expanding CME.


Sun Corona Shock waves Coronal mass ejections (CMEs) 


  1. S. Mancuso et al., Astron. Astrophys. 383, 267–274 (2002)Google Scholar
  2. S. Mancuso, J.C. Raymond, Astron. Astrophys. 413, 363–371 (2004)Google Scholar
  3. S. Mancuso, Astron. Astrophys. 463, 1137–1141 (2007)Google Scholar

Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  1. 1.INAF – Osservatorio Astronomico di TorinoPino Torinese  Italy

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