Failed filament eruption inside a coronal mass ejection in active region 11121 D. Kuridze, M. Mathioudakis, A. F Kowalski, P. H. Keys, D. B. Jess, K. S. Balasubramaniam and F. P. Keenan A&A, 552 (2013) A55 Published online: 22 March 2013 DOI: 10.1051/0004-6361/201220055