HR: 11:20h
AN: SH52B-05    [Abstracts]
TI: Energetic Particles from Corotating Interaction Regions as Observed by STEREO and ACE
AU: * Leske, R A
EM: ral@srl.caltech.edu
AF: California Institute of Technology, Mail Code 220-47, Pasadena, CA 91125, United States
AU: Mewaldt, R A
AF: California Institute of Technology, Mail Code 220-47, Pasadena, CA 91125, United States
AU: Mason, G M
AF: Johns Hopkins University/Applied Physics Laboratory, 11100 Johns Hopkins Rd, Laurel, MD 20723, United States
AU: Cohen, C M
AF: California Institute of Technology, Mail Code 220-47, Pasadena, CA 91125, United States
AU: Cummings, A C
AF: California Institute of Technology, Mail Code 220-47, Pasadena, CA 91125, United States
AU: Davis, A J
AF: California Institute of Technology, Mail Code 220-47, Pasadena, CA 91125, United States
AU: Labrador, A W
AF: California Institute of Technology, Mail Code 220-47, Pasadena, CA 91125, United States
AU: Miyasaka, H
AF: California Institute of Technology, Mail Code 220-47, Pasadena, CA 91125, United States
AU: Stone, E C
AF: California Institute of Technology, Mail Code 220-47, Pasadena, CA 91125, United States
AU: Wiedenbeck, M E
AF: Jet Propulsion Laboratory, California Institute of Technology, MS 169-327, Pasadena, CA 91109, United States
AU: von Rosenvinge, T T
AF: NASA/Goddard Space Flight Center, Code 661, Greenbelt, MD 20771, United States
AB: Since the two STEREO spacecraft entered heliocentric orbit early in 2007 there have been no large solar energetic particle events, however significant particle enhancements due to corotating interaction regions (CIRs) have been regularly observed at 1 AU. The Low Energy Telescope (LET) on each STEREO spacecraft measures elemental composition and spectra for particles from H to Ni from ~2 to ~50 MeV/nucleon, depending on species, and provides anisotropy information for 6 different species or element groups. The Suprathermal Ion Telescope (SIT), also on STEREO, extends ion composition measurements down to lower energies of ~0.05 to 5 MeV/nucleon. As the two STEREO spacecraft move farther apart, the differences in CIR time profiles observed on each become ever greater. Delays on the order of a day are now common between the Behind and Ahead spacecraft, with different features present in the time profiles on each. Using STEREO data along with measurements from ULEIS and SIS on ACE, we present observations of H and He spectra, anisotropies, and time profiles for the CIR events of 2007. This work was supported by NASA under grants NAS5-03131 and NAG5-12929.
DE: 2100 INTERPLANETARY PHYSICS
DE: 2102 Corotating streams
DE: 2114 Energetic particles (7514)
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2007 Fall Meeting