HR: 14:45h
AN: SH53B-05 INVITED    [Abstracts]
TI: Solar Origin of ³He-rich Solar Energetic Particle Events
AU: * Nitta, N V
EM: nitta@lmsal.com
AF: LMATC, Bldg 252, Dept ADBS 3251 Hanover Street, Palo Alto, CA 94304, United States
AU: Mason, G M
AF: JHU/APL, Mailstop MP3-E128, Laurel, MD 20723, United States
AU: Wiedenbeck, M E
AF: JPL, MS 169-327 4800 Oak Grove Dr, Pasadena, CA 91109, United States
AU: Cohen, C M
AF: Caltech, MC 220-47, Pasadena, CA 91125, United States
AB: For more than three decades, we have known solar energetic particle (SEP) events that are characterized by enrichment of ³He and heavy ions. In order to understand the phenomenon, we first need to know where these ions come from. It is not straightforward to identify the solar source of the ³He-rich SEP event, since it often leaves electromagnetic signatures too small to be detected as a flare in spatially-integrated GOES X-ray measurements. Another ambiguity arises from the fact that ³He-rich SEP events are more often observed at low energies, meaning large uncertainties in the particle injection time. In this work we concentrate on ³He-rich SEP events whose injection times are relatively well determined by the ULEIS and SIS experiments on ACE. We show the association of these ³He-rich events with type III radio bursts and non- or mildly-relativistic electron events, and with solar flares, jets and CMEs. We compare our results with those in the literature, and also discuss the possible origin of problem events where we fail to find any solar signatures in the corona.
DE: 7514 Energetic particles (2114)
DE: 7519 Flares
DE: 7524 Magnetic fields
DE: 7554 X-rays, gamma rays, and neutrinos
DE: 7845 Particle acceleration
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2007 Fall Meeting