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The Origin of High-Energy 3He-rich Solar Particle Events

Observed isotope abundances in the energy range >15 MeV nucleon-1 by the ERNE instrument on board Solar and Heliospheric Observatory show a group of high-energy 3He-rich solar particle events that apparently has not been identified in earlier observations. Those events are observed to start well after the flare, when the associated coronal mass ejection (CME) already extends to ~0.3 AU from the Sun. We present the first model of interplanetary reacceleration of 3He that explains main properties of the new group of solar particle events. Our numerical simulations suggest that appearance of 3He in the unusually high-energy range can be caused by a reacceleration of ~1 MeV solar ions in oblique shocks or compressions driven by not very fast CMEs associated with those events.