Heuristic Description of Perpendicular Diffusion of Energetic Particles in Astrophysical Plasmas

Abstract

A heuristic approach for collisionless perpendicular diffusion of energetic particles is presented. Analytic forms for the corresponding diffusion coefficient are derived. The heuristic approach presented here explains the parameter $a^2$ used in previous theories in order to achieve agreement with simulations and its relation to collisionless Rechester & Rosenbluth diffusion. The obtained results are highly relevant for applications because previously used formulas are altered significantly in certain situations.

Paper was accepted by The Astrophysical Journal Letters on August 1st, 2019

References in corpus (3)

• Perpendicular Diffusion of Energetic Particles in Collisionless Plasmas
• Time-Dependent Perpendicular Transport of Energetic Particles in Magnetic Turbulence with Transverse Complexity
• Perpendicular diffusion of energetic particles in noisy reduced magnetohydrodynamic turbulence

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• Propagation of Solar Energetic Particles in the Outer Heliosphere: Interplay between Scattering and Adiabatic Focusing
• Diffusion of relativistic charged particles and field lines in isotropic turbulence: II. Analytical models
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