We use STEREO imagery to study the morphology of a shock driven by a fast coronal mass ejection (CME) launched from the Sun on 2011 March 7. The source region of the CME is located just to the east of a coronal hole. The CME ejecta is deflected away from the hole, in contrast with the shock, which readily expands into the fast outflow from the coronal hole. The result is a CME with ejecta not well centered within the shock surrounding it. The shock shape inferred from the imaging is compared with in situ data at 1 AU, where the shock is observed near Earth by the Wind spacecraft, and at STEREO-A. Shock normals computed from the in situ data are consistent with the shock morphology inferred from imaging.
@article{arxiv.1206.3584,
title = {A Coronal Hole's Effects on CME Shock Morphology in the Inner Heliosphere},
author = {B. E. Wood and C. - C. Wu and A. P. Rouillard and R. A. Howard and D. G. Socker},
journal= {arXiv preprint arXiv:1206.3584},
year = {2015}
}