Göttingen 2025 – scientific programme
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EP: Fachverband Extraterrestrische Physik
EP 14: Astrophysics II
EP 14.3: Talk
Friday, April 4, 2025, 11:30–11:45, ZHG101
Modeling fast charged particle transport in strong magnetic turbulence — •Jeremiah Lübke1, Patrick Reichherzer2, Sophie Aerdker3, Frederic Effenberger1,3, Horst Fichtner3, and Rainer Grauer1 — 1Institut für theoretische Physik I, Ruhr-Universität Bochum, 44801 Bochum, Deutschland — 2Department of Physics, University of Oxford, Oxford OX1 3PU, United Kingdom — 3Institut für theoretische Physik IV, Ruhr-Universität Bochum, 44801 Bochum, Deutschland
The transport of energetic charged particles in strong magnetic turbulence is a highly complex phenomenon. Inspired by recent work on the role of the fieldline curvature in this problem, we investigate the interplay between pitch-angle scattering and fieldline geometry by means of test particle simulations in isotropic MHD snapshots. We characterize the magnetic field as coherent when its local curvature radius is larger than the current gyroradius of the particle, and find distinct transport behavior in either case. Guided by our observations, we develop stochastic models based on a competition between compound diffusion along coherent fieldlines and diffusive scattering. Finally, we discuss implications on synthetic turbulence models and avenues to a transport theory based on a generalized master equation.
Keywords: Turbulence; Diffusion; Magnetohydrodynamics; Pitchangle scattering; Magnetic mirroring