Gang Qin

TL;DR: In this article, a nonlinear theory of the perpendicular diffusion of charged particles is presented, including the influence of parallel scattering and dynamical turbulence, and the theory shows encouraging agreement with numerical simulations.

TL;DR: In this article, Qin, Matthaeus, and Bieber demonstrate that parallel scattering suppresses perpendicular diffusion to a sub-diffusive level when the turbulence lacks transverse structure, and a second regime of diffusive transport can be established.

TL;DR: In this article, the authors examined the transport of charged particles across the mean magnetic field due to broad band, powerlaw-distributed magnetic fluctuations by direct computation of a large number of charged test particle trajectories.

TL;DR: In this article, a nonlinear guiding center theory for parallel and perpendicular diffusion of cosmic rays is proposed, which is based on a coupled system of nonlinear Fokker-Planck coefficients.

TL;DR: In this article, a model calculation of solar energetic particle propagation in a three-dimensional interplanetary magnetic field is presented, which includes essentially all the particle transport mechanisms: streaming along magnetic field lines, convection with the solar wind, pitch-angle diffusion, focusing by the inhomogeneous interplanarial magnetic field, perpendicular diffusion, and pitch angle dependent adiabatic cooling by the expanding solar wind.