Lagrangian statistics for dispersion in magnetohydrodynamic turbulence

Pratt, J., Busse, A. and Muller, W.-C. (2020) Lagrangian statistics for dispersion in magnetohydrodynamic turbulence. Journal of Geophysical Research: Space Physics, 125(11), e2020JA028. (doi: 10.1029/2020JA028245)

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Measurements in the heliosphere and high‐resolution fluid simulations give clear indications for the anisotropy of plasma turbulence in the presence of magnetic fields. How this anisotropy affects transport processes like diffusion and dispersion remains an open question. The first efforts to characterize Lagrangian single‐particle diffusion and two‐particle dispersion in incompressible magnetohydrodynamic (MHD) turbulence were performed a decade ago. We revisit those pioneering results through updated simulations performed at higher Reynolds number. We present new investigations that use the dispersion of many Lagrangian tracer particles to examine the extremes of dispersion and the anisotropy in direct numerical simulations. We then point out directions in which Lagrangian statistics need to be developed to address the fundamental problem of anisotropic MHD turbulence and transport in solar and stellar winds.

Item Type:Articles
Additional Information:This material is based upon work supported by the National Science Foundation under Grant No. 1907876. Simulations were performed on the Konrad and Gottfried computer systems of the Norddeutsche Verbund zur Forderung des Hoch- und Hochstleistungsrechnens (HLRN) by the project bep00051 "Lagrangian studies of incompressible turbulence in plasmas".
Glasgow Author(s) Enlighten ID:Busse, Dr Angela
Authors: Pratt, J., Busse, A., and Muller, W.-C.
College/School:College of Science and Engineering > School of Engineering > Aerospace Sciences
Journal Name:Journal of Geophysical Research: Space Physics
ISSN (Online):2169-9402
Published Online:10 October 2020
Copyright Holders:Copyright © 2020. American Geophysical Union
First Published:First published in Journal of Geophysical Research: Space Physics 125(11):e2020JA028
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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