NUMERICAL SIMULATION OF AN EUV CORONAL WAVE BASED ON THE 2009 FEBRUARY 13 CME EVENT OBSERVED BY STEREO

By O. Cohen, G. Attrill, W. Manchester IV, M. Wills-Davey. 2009

133 citations recorded by the source corpus.

On 2009 February 13, a coronal wave—CME—dimming event was observed in quadrature by the Solar Terrestrial Relations Observatory (STEREO) spacecraft. We analyze this event using a three-dimensional, global magnetohydrodynamic 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 3 R☉; 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 Å. 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.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/8e3cccdef13e3de126266a08e865676196685ac0

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Citations in the corpus

The Physical Processes of CME/ICME Evolution (2017, background): “Some simulations restrict the calculation to the evolution in the corona (e.g., Roussev et al. 2007; Cohen et al. 2009; Zuccarello et al. 2012b; Amari et al. 2014; Fan 2016), while others model the propagation of the ejecta to 1 AU but do not include the coronal evolution.”
Advances in Observing Various Coronal EUV Waves in the SDO Era and Their Seismological Applications (Invited Review) (2014, unknown): “Using the coronal module of the Block-Adaptive Tree Solar-wind Roe Upwind Scheme (BATSRUS) code (Roussev et al., 2003), Cohen et al. (2009) confirmed the wave/non-wave bimodality, and Schmidt and Ofman (2010) reproduced the observed EIT wave reflection from a coronal hole.”
OBSERVATIONS AND INTERPRETATION OF A LOW CORONAL SHOCK WAVE OBSERVED IN THE EUV BY THE SDO/AIA (2011, methodology): “A hybrid wave/non-wave hypothesis was first suggested by Zhukov & Auchère (2004) and has been extended using computational simulation (Cohen et al. 2009; Downs et al. 2011).”