The almost monoenergetic ion event on 19 October 2009: SEPT/STEREO observations A. Klassen, R. Gómez-Herrero, R. Müller-Mellin, B. Heber, R. F. Wimmer-Schweingruber, A. Opitz and J.-A. Sauvaud A&A, 528 (2011) A84 Published online: 04 March 2011 DOI: 10.1051/0004-6361/201014563