HR: 11:50h
AN: SH12A-07    [Abstracts]
TI: Energetic Particle Acceleration at Near-Earth by Interplanetary Shocks
AU: * Ho, G C
EM: George.Ho@jhuapl.edu
AF: Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723 United States
AU: Lario, D
AF: Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723 United States
AU: Desai, M I
AF: University of Maryland, Department of Physics, College park, MD 20742 United States
AU: Hu, Q
AF: University of California Riverside, Institute of Geophysics & Planetary, Riverside, CA 92521 United States
AU: Kasper, J
AF: Massachusetts Institute of Technology, Center for Space Research, Cambridge, MA 02139 United States
AB: Interplanetary (IP) shocks provide an excellent opportunity to study energetic particle acceleration. During an IP shock related energetic storm particle (ESP) event, both the shock and the accelerated particles can be measured in-situ simultaneously. Thus, a study of in-situ IP shocks and particle distributions in their vicinity provides a meaningful way to test our theoretical understanding of shock acceleration. In addition, with simultaneous multi-point measurements (such as ACE and Wind), we have for the first time enough data to construct a global picture of IP shock propagation and acceleration from L1 to the Earth. During the current solar cycle, advanced particle instruments on board both the ACE and Wind spacecraft have detected numerous ESP events and therefore provided us with an ideal dataset to study IP shock acceleration in unprecedented detail. In this paper, we will combine simultaneous measurements of ACE/EPAM, ACE/ULEIS, and Wind/STEP during several ESP events and examine the spatial and temporal variations of these events in the Earth's vicinity. We will also investigate the ion composition and energy spectra for some of these events and investigate their relationship with the locally measured properties of the IP shocks.
DE: 7807 Charged particle motion and acceleration
DE: 7851 Shock waves
DE: 2114 Energetic particles, heliospheric (7514)
DE: 2139 Interplanetary shocks
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2004 AGU Fall Meeting