Stuttgart 2012 – wissenschaftliches Programm
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EP: Fachverband Extraterrestrische Physik
EP 14: Poster Sonne und Heliosphäre
EP 14.7: Poster
Mittwoch, 14. März 2012, 16:30–19:00, Poster.V
STEREO observations of unusual wide-spread SEP events — •Nina Dresing1, Raúl Gómez-Herrero1, Andreas Klassen1, Bernd Heber1, Yulia Kartavykh2,3, and Wolfgang Dröge2 — 1IEAP, University of Kiel, Germany — 2Institut für Theoretische Physik und Astrophysik, University of Würzburg, Germany — 3Ioffe Physical-Technical Institute, St. Petersburg, Russian Federation
With the end of 2009 after the prolonged solar minimum of cycle 23 solar activity finally increased. The meanwhile well separated STEREO spacecraft in combination with further observers located at L1 provide a unique platform to investigate the longitudinal spread of solar energetic particle (SEP) events at 1 AU. Several event showing longitudinal particle distributions larger than 100 degrees have been observed. Some extreme cases even show energetic particle spreads almost all around the Sun as the January 17, 2010 or the November 3, 2011 SEP events. While large longitudinal SEP distributions are commonly explained by the existence of a large CME driven shock, events with an almost 360 degree spread are hardly described by only one overall process. The unusual wide-spread multi-spacecraft observations will be presented and discussed in terms of source mechanisms and particle transport through the interplanetary medium.