PoS - Proceedings of Science
Volume 444 - 38th International Cosmic Ray Conference (ICRC2023) - Cosmic-Ray Physics (Indirect, CRI)
Derivation of diffusion-tensor coefficients for the transport of charged particles in magnetic fields
O. Deligny
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Pre-published on: July 25, 2023
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The transport of charged particles in various astrophysical environments permeated by magnetic fields is described in terms of a diffusion process, which relies on diffusion-tensor parameters generally inferred from Monte-Carlo simulations. Based on a red-noise approximation to model the two-point correlation function of the magnetic field experienced by charged particles between two successive times, the diffusion-tensor coefficients were previously derived in the case of pure turbulence. In this contribution, the derivation is extended to the case of a mean field on top of the turbulence. In addition, the red-noise approximation is relaxed by modeling the relevant two-point correlation function obtained by Monte-Carlo simulations for a wide range of test-particle rigidities.
DOI: https://doi.org/10.22323/1.444.0509
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