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Using the SIT (Suprathermal Ion Telescope) instrument on STEREO-A we haveexamined the abundance of the rare isotope 3He during the rising activity phaseof solar cycle 24 between January 2010 and December 2011. We have identifiedsix solar energetic particle (SEP) events with enormous abundance enhancementsof 3He (3He/4He >1). The events were short lasting, typically ~0.5-1 day andmost of them occurred in association with high-speed solar wind streams andcorotating interaction regions. With one exception the events were notassociated with ~100 keV solar electron intensity increases. The events showedalso enhanced NeS/O and Fe/O ratios. The solar images indicate that the eventswere generally associated with the active regions located near a coronal hole.

3He-rich SEP Events Observed by STEREO-A