HR: 0830h
AN: SH11C-1120    [PDF]
TI: Particle Diffusion on Vortex Structures in the Heliosphere
AU: * Verkhoglyadova, O P
EM: olgav@citrus.ucr.edu
AF: Institute of Geophysics and Planetary Physics, University of California, Riverside, CA 92521-0412 United States
AU: LeRoux, J A
EM: Jakobus@ucrac1.ucr.edu
AF: Institute of Geophysics and Planetary Physics, University of California, Riverside, CA 92521-0412 United States
AB: Standard theory of energetic particle transport in magnetic irregularities focus on weak random fluctuations described as linear MHD wave modes and does not include non-linear coherent structures such as vortices. To address this shortcoming, a study of energetic particle diffusion in heliosphere with taking into account scattering on vortices is made. We consider vortices as nonlinear coherent planar structures orthogonal to the background magnetic field. They can be derived in the framework of nearly incompressible 2D MHD for a subsonic plasma in the fluid frame with finite plasma beta. Partial solutions which correspond to "zero-frequency" modes in the linear regime are obtained. These solutions take the form of vortices or convective cells in the nonlinear regime. Transport coefficients for energetic particles moving in a vortex field are evaluated using the Hamiltonian formalism and variational principles. Further applications for study of cosmic ray transport in the heliosphere are discussed.
DE: 0654 Plasmas
DE: 2104 Cosmic rays
DE: 2149 MHD waves and turbulence
DE: 7839 Nonlinear phenomena
DE: 7863 Turbulence
SC: SPA - Solar and Heliospheric Physics [SH]
MN: 2003 Fall Meeting