Journal Article

Gyrophase diffusion of charged particles in random magnetic fields

A. Shalchi

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 426, issue 2, pages 880-891
Published in print October 2012 | ISSN: 0035-8711
Published online October 2012 | e-ISSN: 1365-2966 | DOI:
Gyrophase diffusion of charged particles in random magnetic fields

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If charged particles propagate through a magnetized plasma, they experience different scattering effects. Well-known effects that have been studied previously include spatial diffusion and pitch-angle scattering as well as stochastic acceleration. So-called gyrophase diffusion, which describes stochastic changes of the gyrophase due to interaction with magnetic turbulence, has been ignored in previous works. Therefore, we compute gyrophase diffusion coefficients by employing quasi-linear theory as well as a second-order approach. We then compute the velocity distribution function by solving the corresponding differential equation. These results are important for testing previous assumptions employed in particle diffusion theories. As an application, we compute velocity correlation functions and diffusion coefficients along and across the mean magnetic field.

Keywords: diffusion; magnetic fields; turbulence

Journal Article.  6680 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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