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Identification of a peculiar radio source in the aftermath of large coronal mass ejection events View all abstracts by submitter

Angelos Vourlidas   Submitted: 2007-01-24 13:29

We report the discovery of a new radio feature associated with coronal mass ejection (CME) events. The feature is a low frequency (<1~MHz), relatively wide (sim 300~kHz) continuum that appears just after the main phase of the eruptive event, lasts for several hours, and exhibits a slow negative frequency drift. So far, we have identified this radio signature in a handful of CME events and suspect it might be a common occurrence. The radio continuum starts almost simultaneously with the commonly observed decimetric type-IV stationary continuum (also called flare-continuum) but the two seem unrelated. The emission mechanism, whether plasma emission or gyroresonance, is unclear at the moment. Based on our preliminary analysis, we interpret this radio continuum as the lateral interaction of the CME with magnetic structures. Another possibility is that this continuum traces the reconfiguration of large-scale loop systems, such as streamers. In other words, it could be the large-scale counterpart of the post-CME arcades seen over active region neutral lines after big CME events. This letter aims to bring attention to this feature and attract more research into its nature.

Authors: A. Vourlidas, M. Pick, S. Hoang, P. Demoulin
Projects: SoHO-LASCO

Publication Status: ApJ Letters (accepted, Feb 20, 2007)
Last Modified: 2007-01-25 09:48
Go to main E-Print page  Orientations of LASCO Halo CMEs and Their Connection to the Flux Rope Structure of Interplanetary CMEs  A Statistical Study of Shear Motion of the Footpoints in Two-ribbon Flares  Edit Entry  Delete Entry 

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