Göttingen 2025 – wissenschaftliches Programm

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SYSF: Symposium Turbulence in Space and Fusion Plasmas

SYSF 1: Turbulence in Space and Fusion Plasmas

SYSF 1.2: Hauptvortrag

Mittwoch, 2. April 2025, 14:30–15:00, ZHG101

Particle acceleration and transport in astrophysical, magnetized turbulent plasmas — •Martin Lemoine — Astroparticule & Cosmologie (APC, CNRS, Universite Paris-Cite), F-75013 Paris, France

How charged particles are transported in phase space in magnetized turbulence is a broad topic in plasma physics with fundamental applications in astrophysics, from solar system plasmas to the more extreme plasmas of the high-energy multi-messenger universe. In its most standard formulation, such transport is described by a quasilinear formalism that ascribes pitch-angle scattering and momentum diffusion to wave-particle interactions. This talk examines an alternative picture, in which transport is rather mediated by coherent/intermittent structures. It will discuss the possibility that spatial transport occurs through localized interactions with sharp magnetic field bends and that particle acceleration can take place through interactions with coherent velocity structures. Finally, it will discuss these findings in the broader context of recent (kinetic and magnetohydrodynamic) numerical simulations of particle transport and acceleration.

Keywords: turbulence; particle transport; astrophysics; particle acceleration