HR: 17:39h
AN: SH44A-07 INVITED     [Abstracts]
TI: Test particle energization on short time scales by MHD turbulence: clues to dissipation mechanisms?
AU: * Dmitruk, P
EM: pablo@bartol.udel.edu
AF: Bartol Research Institute University of Delaware, 217 Sharp Lab, Newark, DE 19711 United States
AU: Matthaeus, W H
AF: Bartol Research Institute University of Delaware, 217 Sharp Lab, Newark, DE 19711 United States
AB: We consider the motion of test particles on short time scales in fields obtained from direct numerical simulations of three-dimensional MHD turbulence with a strong background magnetic field. We observe different properties of the velocity distribution of particles, whether electrons or protons are considered, due to the different ratio of particles' gyroradii to the MHD dissipative scales. The anisotropy of the distributions is suggestive of some of the observed properties of solar energetic particles. Although the test particle approach is incomplete, we speculate that these results could be useful on understanding possible dissipation mechanisms for models of coronal heating based on formation of current sheets and quasi-2D turbulence.
DE: 7807 Charged particle motion and acceleration
DE: 7863 Turbulence
DE: 2149 MHD waves and turbulence
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2004 AGU Fall Meeting