The almost monoenergetic ion event on 19 October 2009: SEPT/STEREO observationsA. Klassen, R. Gómez-Herrero, R. Müller-Mellin, B. Heber, R. F. Wimmer-Schweingruber, A. Opitz and J.-A. SauvaudA&A, 528 (2011) A84DOI: https://doi.org/10.1051/0004-6361/201014563