TY - JOUR A1 - Klassen, A. A1 - Gómez-Herrero, R. A1 - Müller-Mellin, R. A1 - Böttcher, S. A1 - Heber, B. A1 - Wimmer-Schweingruber, R. A1 - Mason, G. M. T1 - STEREO/SEPT observations of upstream particle events: almost monoenergetic ion beams JO - Ann. Geophys. J1 - ANGEO VL - 27 IS - 5 SP - 2077 EP - 2085 Y1 - 2009/05/06 PB - Copernicus Publications SN - 1432-0576 UR - https://angeo.copernicus.org/articles/27/2077/2009/ L1 - https://angeo.copernicus.org/articles/27/2077/2009/angeo-27-2077-2009.pdf DO - 10.5194/angeo-27-2077-2009 ER -