First-principles Fermi acceleration in magnetized turbulence
High Energy Astrophysical Phenomena
2022-11-30 v1 Solar and Stellar Astrophysics
Plasma Physics
Abstract
This work provides a concrete implementation of E. Fermi's model of particle acceleration in magnetohydrodynamic (MHD) turbulence, connecting the rate of energization to the gradients of the velocity of magnetic field lines, which it characterizes within a multifractal picture of turbulence intermittency. It then derives a transport equation in momentum space for the distribution function. This description is shown to be substantiated by a large-scale numerical simulation of strong MHD turbulence. The present, general framework can be used to model particle acceleration in a variety of environments.
Keywords
Cite
@article{arxiv.2210.01038,
title = {First-principles Fermi acceleration in magnetized turbulence},
author = {Martin Lemoine},
journal= {arXiv preprint arXiv:2210.01038},
year = {2022}
}
Comments
to appear in Phys. Rev. Lett. -- includes supplemental material in appendix