HR: 0800h
AN: SH21C-0440    [Abstracts]
TI: Propagation of Energetic Charged Particles in the Solar Wind: Effects of intermittency in the Medium
AU: * Kaghashvili, E K
EM: ekaghash@ucr.edu
AF: Institute of Geophysics and Planetary Physics, University of California, Riverside, CA 92521 United States
AU: Zank, G P
EM: zank@ucrac1.ucr.edu
AF: Institute of Geophysics and Planetary Physics, University of California, Riverside, CA 92521 United States
AU: Webb, G M
EM: gmwebb@citrus.ucr.edu
AF: Institute of Geophysics and Planetary Physics, University of California, Riverside, CA 92521 United States
AB: We address the issue of ``dropouts" observed by the Advanced Composition Explorer (ACE) spacecraft. We study the temporal evolution of energetic particle beams in a turbulent solar wind environment using the propagating source method [Zank et al., 1999, 2000], which is based on the separation of the total particle distribution function into a main beam component (unscattered part) and a secondary component produced by the scattered beam particles. Unlike recent approaches that try to explain the ``dropout" phenomenon using steep localized gradients in the medium normal to the background magnetic field, we show here that intermittent changes in the turbulence responsible for scattering particles in the radial direction of the solar wind medium can also contribute to the generation of fine-scale structure in the intensity profiles of impulsive events. Our aim here is to simplify the problem to the extent that it allows us to demonstrate the suggested process. Implications of a more complicated transport equation are also discussed.
DE: 7514 Energetic particles (2114)
DE: 7843 Numerical simulation studies
DE: 7859 Transport processes
DE: 2114 Energetic particles, heliospheric (7514)
DE: 2118 Energetic particles, solar
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2004 AGU Fall Meeting