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Hinode/XRT and STEREO observations of a diffuse coronal ''wave''-CME-dimming event View all abstracts by submitter

Gemma Attrill   Submitted: 2009-09-17 12:39

We report on observations of the first diffuse coronal wave detected by Hinode/XRT. The event occurred near the West solar limb on 23 May 2007, originating from active region (AR) 10956 and was associated with a coronal mass ejection (CME) and coronal dimmings. The bright emission forming the coronal wave expanded both to the East and South of the AR. We use XRT and STEREO Behind (B) data combined with a potential magnetic field extrapolation to derive an understanding of the global magnetic field connectivity. The brightenings observed East and South of the source AR are generated by two different physical processes, due to the distinct magnetic environments in these regions. We attribute the brightening to the East of the AR to compression and channelling of the plasma along large-scale loops. The brightening to the South of the AR expands across the quiet Sun, making the southern component a likely candidate for identification as a diffuse coronal wave. We analyse the bright front in STEREO/EUVI (B) 171, 195 and 284 A images, as well as in XRT data, finding the strongest components to be largely co-spatial in all bandpasses. We also exploit the near-limb location of this event by combining STEREO/COR1 and EUVI data. Using all the data we derive a full picture of the low-coronal development of the eruption. The COR1 data show that the southern-most outer edge of the CME is progressively displaced southward during the expansion. EUVI data below the COR1 occulting disk show that the CME is significantly distorted in the low corona as a result of the associated filament eruption. The core coronal dimmings map to the core of the CME; the secondary coronal dimmings map to the CME cavity; and the diffuse coronal wave maps to the outermost edge of the expanding CME shell. The analysis of this near-limb event has important implications for understanding earlier eruptions originating from the same AR on 16, 19 and 20 May 2007.

Authors: Gemma D. R. Attrill, Alexander J. Engell, Meredith J. Wills-Davey, Paolo Grigis and Paola Testa
Projects: Hinode/XRT,STEREO

Publication Status: ApJ (in press)
Last Modified: 2009-09-18 10:37
Go to main E-Print page  Numerical Simulation of an EUV Coronal Wave Based on the February 13, 2009 CME Event Observed by STEREO  Coronal Holes  Edit Entry  Download Preprint  Delete Entry 

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