Interacting CMEs and Solar Energetic Particles
Abstract
We examined the solar sources of a set of large solar energetic particle (SEP) events with mixed (impulsive + gradual) abundance signatures. The SEP events were detected by the Solar Isotope Spectrometer (SIS) on board the Advanced Composition Explorer (ACE) spacecraft. For each of the SEP events, we identified a "primary" coronal mass ejection (CME), detected by the Solar and Heliospheric observatory (SOHO). Then we examined a set of CMEs preceding the primary CME, potentially interacting with the primary CME in the near-Sun interplanetary medium. Twenty events from a list of 27 recently compiled von Rosenvinge et al. (Proc. ICRC 2001, p. 3136) overlapped with SOHO observations. Preliminary results indicate that a large majority of the primary CMEs were preceded by slower CMEs, suggesting that CME interaction may result in abundance enhancements in the source material. Research supported by NASA and AFOSR.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2001
- Bibcode:
- 2001AGUFMSH12A0735G
- Keywords:
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- 7513 Coronal mass ejections;
- 7514 Energetic particles (2114);
- 7519 Flares;
- 7851 Shock waves