Particle Scattering in Magnetized Plasmas and Diffusive Shock Acceleration at Perpendicular Interplanetary Shock Waves

摘要

Particle scattering in pure magnetic turbulence is investigated by combining the Newton‐Lorentz equation with the well‐established nonlinear guiding center theory. Cross field diffusion coefficients are calculated as well as certain limits in particle energy and turbulence strength. In addition to the well‐known nonlinear results we find a new contribution which describes particle scattering away from a single field line. In particular, perpendicular diffusion can be described as a superposition of scattering due to wandering magnetic field lines and scattering away from a single field line. As an example, the new results are used to calculate the maximum energy of protons accelerated at perpendicular interplanetary shock waves driven by a coronal mass ejection.