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Coronal ''Wave'': Magnetic Footprint of a CME? View all abstracts by submitter

Gemma Attrill   Submitted: 2007-01-26 06:03

We investigate the properties of two ''classical'' EIT coronal waves. The two source regions of the associated CMEs possess opposite helicities and the coronal waves display rotations in opposite senses. We observe deep core dimmings near the flare site and also widespread diffuse dimming, accompanying the expansion of the EIT wave. We also report a new property of these EIT waves, namely that they display dual brightenings: persistent ones at the outermost edge of the core dimming regions and simultaneously diffuse brightenings constituting the leading edge of the coronal wave, surrounding the expanding diffuse dimmings. We show that such behaviour is consistent with a diffuse EIT wave being the magnetic footprint of a CME. We propose a new mechanism where driven magnetic reconnections between the skirt of the expanding CME magnetic field and quiet-Sun magnetic loops generate the observed bright diffuse front. The dual brightenings and the widespread diffuse dimming are identified as innate characteristics of this process.

Authors: Gemma Attrill, Louise Harra, Lidia van Driel-Gesztelyi & Pascal Demoulin
Projects: SoHO-EIT,SoHO-MDI

Publication Status: ApJL (In press)
Last Modified: 2007-01-26 10:40
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