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EP: Fachverband Extraterrestrische Physik

EP 3: Poster

EP 3.26: Poster

Montag, 15. März 2010, 17:45–19:00, AKM Foyer

Multi-point observations of CIR-associated energetic ions — Nina Dresing¹, Raul Gomez-Herrero¹, Olga Malandraki², Emilia Kilpua³, •Bernd Heber¹, Andreas Klassen¹, Reinhold Müller-Mellin¹, and Robert F. Wimmer-Schweingruber¹ — ¹IEAP, Universität Kiel, Deutschland — ²Institute for Astronomy and Astrophysics, National Observatory of Athens, Greece — ³Department of Physical Sciences, Theoretical Physics Division, University of Helsinki, Finland

In absence of solar activity, Co-rotating Interaction Regions (CIRs) are a prevailing source of energetic ions observed near 1 AU. The twin STEREO spacecraft launched in October 2006, together with near-Earth spatial observatories offer an excellent platform for multi-point studies of CIR. Time-shifting and back-mapping techniques allow the comparison of ion increases observed by different spacecraft at different times but associated to the same CIR. The analysis shows that CIR-associated ions frequently show significant differences, particularly at sub-MeV energies. We present several cases where these differences are linked to the presence of Interplanetary Coronal Mass Ejections (ICMEs) or small-scale interplanetary transients in the vicinity or embedded in the CIR. Evidences of the possible role of ICME-CIR interaction as sources of temporal variations in the CIR-associated ion increases are presented and discussed.