Authors: Radoslav Bucik (SwRI), Samuel T. Hart (UTSA), Maher A. Dayeh (SwRI), Mihir I. Desai (SwRI), Glenn M. Mason (JHU/APL), Mark E. Wiedenbeck (JPL/Caltech)

We examined the origin of 3He abundance enhancement in 23 high energy (25–50 MeV) solar proton events. In seven events, 3He enhancement was due to 3He leftover from preceding events or independent 3He events occurring during proton events. One event is the most likely impulsive (3He-rich), and another is unclear. Reaccelerated remnant flare material was the most probable cause of 3He enhancements in the remaining 14 proton events. Imaging observations showed coronal jets in the parent active regions in six of these 14 events. Remarkably, the highest 3He/4He occurred in events with jets, implying their contribution to 3He enhancement.