HR: 0800h
AN: SH21B-0428    [Abstracts]
TI: Lessons from Sequences of SEP Heavy Ion Events Associated with Active Region Passages Across the Disk
AU: * Cid, X
EM: cuicatl@ssl.berkeley.edu
AF: Space Sciences Laboratory, University of California, Berkeley, CA 94720 United States
AU: Luhmann, J G
EM: jgluhman@ssl.berkeley.edu
AF: Space Sciences Laboratory, University of California, Berkeley, CA 94720 United States
AU: Mewaldt, R A
EM: rmewaldt@srl.caltech.edu
AF: Physics Dept., California Institute of Technology, Pasadena, CA 91125 United States
AU: Cohen, C M
EM: cohen@srl.caltech.edu
AF: Physics Dept., California Institute of Technology, Pasadena, CA 91125 United States
AB: The origin and heliospheric transport of SEP heavy ions are important areas for study due to both the hazards to humans and technologies these ions represent, as well as the information they contain about the processes of particle acceleration by the Sun. It has been suggested that compositional differences which depend on solar event longitude are associated with the particular geometry of the observer's connection to the CME-related shock. To learn more about this hypothesis, we analyze a number of significant heavy ion SEP events that occur in sequences of three as a CME-productive active region makes its way across the disk from east to center to west limb. For this purpose we use the SIS data from ACE, including ions above 5 MeV/n and masses up to and including Fe. We report on trends in the relative fluxes of heavy species that suggest altitude of connection rather than longitude of connection effects.
DE: 2111 Ejecta, driver gases, and magnetic clouds
DE: 2118 Energetic particles, solar
DE: 2139 Interplanetary shocks
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2004 AGU Fall Meeting