HR: 0830h
AN: SH11D-1139    [PDF]
TI: Testing Shock Acceleration in Solar Particle Events: Composition of Suprathermal Onsets
AU: * Posner, A
EM: aposner@swri.edu
AF: Southwest Research Institute, PO Drawer 28510, San Antonio, TX 78228-0510 United States
AU: Schwadron, N A
EM: nschwadron@swri.edu
AF: Southwest Research Institute, PO Drawer 28510, San Antonio, TX 78228-0510 United States
AU: McComas, D J
EM: dmccomas@swri.edu
AF: Southwest Research Institute, PO Drawer 28510, San Antonio, TX 78228-0510 United States
AU: Gloeckler, G
EM: gg10@umail.umd.edu
AF: University of Maryland, Dept. of Physics, College Park, MD 20742 United States
AU: Kunow, H
EM: kunow@physik.uni-kiel.de
AF: University of Kiel, IEAP Leibnizstr. 11, Kiel, 24118 Germany
AB: Energetic particle events are typically associated with solar activity, i.e. flares and coronal mass ejections (CMEs). Observationally, relativistic particles arrive at 1 AU within an hour of such activity. In contrast, suprathermal ions, that form the link between the highly energized ions and their seed population, take up to two days to reach Earth. Inner source pickup ions, a population of singly ionized particles believed to originate from the interaction of the solar wind with small dust grains, are formed in the inner heliosphere at and beyond ten solar radii. Fast CME shocks must encounter inner source pickup ions within three hours of propagation. We discuss implications of suprathermal ion composition on near-Sun acceleration processes and seed populations. A critical test is the contribution of inner source pickup ions in the readily identified suprathermal ion onsets at 1 AU.
DE: 2118 Energetic particles, solar
DE: 2129 Interplanetary dust
DE: 2152 Pickup ions
DE: 7513 Coronal mass ejections
DE: 7519 Flares
SC: SPA - Solar and Heliospheric Physics [SH]
MN: 2003 Fall Meeting