Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh43a1644q&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH43A-1644
Physics
7807 Charged Particle Motion And Acceleration, 7859 Transport Processes, 7863 Turbulence (4490)
Scientific paper
Previous numerical simulations (Qin et al., GRL, 29(4), 1048, 2002; ApJL, 578(2), L117, 2002) found that the transport of energetic particles behaves as sub-diffusive in magnetic turbulence with weak 3D structures, but their diffusive behavior can be recovered with strong 3D turbulence structures. Magnetic turbulence in the solar wind is large and strongly 3d; therefore, energetic particle transport in the heliosphere is most likely to be diffusive. Under certain parameter regions, the perpendicular mean free path of particles could be as large as their parallel one because of nonlinear effects. These simulations led to the so called Nonlinear Guiding Center theory (NLGC, Matthaeus et al. ApJL, 2003) that can describe the perpendicular diffusion of energetic particles very well at least when compared model simulations. However, in all the previous simulations turbulence was usually assumed to be time-independent, thus the NLGC theory has only been tested by simulations in time-independent cases. In this paper we develop numerical models of particle transport in dynamic magnetic turbulence. Conditions for recovery of diffusive behavior of particle transport will be reestablished and the NLGC theory will be retested by new simulation results.
Qin Gan
Zhang Minghui
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