HR: 0800h
AN: SH21C-0434    [Abstracts]
TI: Particle spectra and upstream turbulence at CME-driven shocks
AU: Rice, W K
EM: wkmrice@ucr.edu
AF: IGPP, University of California, Riverside, CA 92521 United States
AU: * Li, G
EM: gang.li@ucr.edu
AF: IGPP, University of California, Riverside, CA 92521 United States
AU: Zank, G P
EM: zank@ucr.edu
AF: IGPP, University of California, Riverside, CA 92521 United States
AB: Particle spectra at a CME-driven shock often exhibit a power law to certain energies, then roll over exponentially. However, there are cases where a spectrum evolves to another power law, often softer, above a certain energy (e.g. the Oct. 29th, 2003 event [Mewaldt et al., 2004]. By introducing an effective ``loss term'' to the transport equation, we show that under certain circumstances, a broken power law can be obtained. We discuss the physical meaning of the loss term and its relationship with the upstream turbulence. We note that observations of particle spectra at CME-driven shocks provide us a complimentary method for studying the upstream turbulence in front of the shock.
DE: 7513 Coronal mass ejections
DE: 7519 Flares
DE: 2118 Energetic particles, solar
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2004 AGU Fall Meeting