HR: 17:45h
AN: SH14A-08    [Abstracts]
TI: What can we learn from heavy ion spectra in large SEP events?
AU: Hu, Q
EM: qiang.hu@ucr.edu
AF: IGPP, Univerisity of California at Riverside, Univ. of California, Riverside, CA 92521 United States
AU: * Li, G
EM: gang.li@ucr.edu
AF: IGPP, Univerisity of California at Riverside, Univ. of California, Riverside, CA 92521 United States
AU: Zank, G P
EM: zank@ucr.edu
AF: IGPP, Univerisity of California at Riverside, Univ. of California, Riverside, CA 92521 United States
AB: Particle spectra at a CME-driven shocks can be approximated by either a power law with exponential roll over or by a broken power law. In both cases, an important parameter, the breaking energy E₀, can be extracted from observations. Since the shape of particle spectra is a result of the balance between two competing processes: particle acceleration at the shock and particle loss from the shock, the parameter E₀ contains rich information about both processes. In this work, we study the dependence of E₀ on (Q/A), i. e. E₀ for various heavy ions. It has been shown that the value of E₀ for heavy ions often exhibit a (Q/A)^α dependence with alpha ranging from 1 to 2, varying from event to event. We discuss how α can depend on both the acceleration process and the loss process and what can we learn from the (Q/A)^α dependence of E₀.
DE: 7513 Coronal mass ejections (2101)
DE: 7514 Energetic particles (2114)
DE: 7924 Forecasting (2722)
DE: 7959 Models
SC: SPA-Solar and Heliospheric Physics [SH]
MN: Fall Meeting 2005