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Title:
Self-inhibiting thermal conduction in a high- , whistler-unstable plasma
Authors:
Komarov, S.; Schekochihin, A. A.; Churazov, E.; Spitkovsky, A.
Affiliation:
AA(Space Research Institute (IKI), Profsouznaya 84/32, Moscow 117997, Russia), AB(The Rudolf Peierls Centre for Theoretical Physics, University of Oxford, 1 Keble Road, Oxford OX1 3NP, UK), AC(Max Planck Institute for Astrophysics, Karl-Schwarzschild-Strasse 1, 85741 Garching, Germany), AD(Department of Astrophysical Sciences, Princeton University, Peyton Hall, Princeton, NJ 08544, USA)
Publication:
Journal of Plasma Physics, Volume 84, Issue 3, article id. 905840305, 25 pp.
Publication Date:
06/2018
Origin:
CUP
Keywords:
astrophysical plasmas, plasma instabilities, plasma simulation
Abstract Copyright:
(c) 2018: © Cambridge University Press 2018
DOI:
10.1017/S0022377818000399
Bibliographic Code:
2018JPlPh..84c9005K

Abstract

A heat flux in a high- plasma with low collisionality triggers the whistler instability. Quasilinear theory predicts saturation of the instability in a marginal state characterized by a heat flux that is fully controlled by electron scattering off magnetic perturbations. This marginal heat flux does not depend on the temperature gradient and scales as . We confirm this theoretical prediction by performing numerical particle-in-cell simulations of the instability. We further calculate the saturation level of magnetic perturbations and the electron scattering rate as functions of and the temperature gradient to identify the saturation mechanism as quasilinear. Suppression of the heat flux is caused by oblique whistlers with magnetic-energy density distributed over a wide range of propagation angles. This result can be applied to high- astrophysical plasmas, such as the intracluster medium, where thermal conduction at sharp temperature gradients along magnetic-field lines can be significantly suppressed. We provide a convenient expression for the amount of suppression of the heat flux relative to the classical Spitzer value as a function of the temperature gradient and . For a turbulent plasma, the additional independent suppression by the mirror instability is capable of producing large total suppression factors (several tens in galaxy clusters) in regions with strong temperature gradients.
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