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Lookup NU author(s): Professor Anvar Shukurov,
Dr Andrew Snodin,
Dr Paul Bushby,
Dr Toby Wood
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).
The propagation of cosmic rays in turbulent magnetic fields is a diffusive process driven by the scattering of the charged particles by random magnetic fluctuations. Such fields are usually highly intermittent, consisting of intense magnetic filaments and ribbons surrounded by weaker, unstructured fluctuations. Studies of cosmic ray propagation have largely overlooked intermittency, instead adopting Gaussian random magnetic fields. Using test particle simulations, we calculate cosmic ray diffusivity in intermittent, dynamo-generated magnetic fields. The results are compared with those obtained from non-intermittent magnetic fields having identical power spectra. The presence of magnetic intermittency significantly enhances cosmic ray diffusion over a wide range of particle energies. We demonstrate that the results can be interpreted in terms of a correlated random walk.
Author(s): Shukurov A, Snodin AP, Seta A, Bushby PJ, Wood TS
Publication type: Article
Publication status: Published
Journal: Astrophysical Journal Letters
Print publication date: 10/04/2017
Online publication date: 12/04/2017
Acceptance date: 31/03/2017
Date deposited: 03/04/2017
ISSN (print): 2041-8205
ISSN (electronic): 2041-8213
Publisher: IOP Publishing Ltd.
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