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Numerical Simulation of an EUV Coronal Wave Based on the February 13, 2009 CME Event Observed by STEREO View all abstracts by submitter

Gemma Attrill   Submitted: 2009-09-17 12:44

On 13 February 2009, a coronal wave ? CME ? dimming event was observed in quadrature by the STEREO spacecraft. We analyze this event using a three-dimensional, global magnetohydrodynamic (MHD) model for the solar corona. The numerical simulation is driven and constrained by the observations, and indicates where magnetic reconnection occurs between the expanding CME core and surrounding environment. We focus primarily on the lower corona, extending out to 3R⊙; this range allows simultaneous comparison with both EUVI and COR1 data. Our simulation produces a diffuse coronal bright front remarkably similar to that observed by STEREO/EUVI at 195 A. It is made up of two components, and is the result of a combination of both wave and non-wave mechanisms. The CME becomes large-scale quite low (< 200 Mm) in the corona. It is not, however, an inherently large-scale event; rather, the expansion is facilitated by magnetic reconnection between the expanding CME core and the surrounding magnetic environment. In support of this, we also find numerous secondary dimmings, many far from the initial CME source region. Relating such dimmings to reconnecting field lines within the simulation provides further evidence that CME expansion leads to the "opening" of coronal field lines on a global scale. Throughout the CME expansion, the coronal wave maps directly to the CME footprint. Our results suggest that the ongoing debate over the "true" nature of diffuse coronal waves may be mischaracterized. It appears that both wave and non-wave models are required to explain the observations and understand the complex nature of these events.

Authors: Ofer Cohen, Gemma D. R. Attrill, Ward B. Manchester IV and Meredith J. Wills-Davey

Publication Status: ApJ (accepted)
Last Modified: 2009-09-18 10:31
Go to main E-Print page  Resonantly Damped Kink Magnetohydrodynamic Waves in a Partially Ionized Filament Thread  Hinode/XRT and STEREO observations of a diffuse coronal ''wave''-CME-dimming event  Edit Entry  Download Preprint  Delete Entry 

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