Suppression of electron thermal conduction by whistler turbulence in a sustained thermal gradient

Abstract

The dynamics of weakly magnetized collisionless plasmas in the presence of an imposed temperature gradient along an ambient magnetic field is explored with particle-in-cell simulations and modeling. Two thermal reservoirs at different temperatures drive an electron heat flux that destabilizes off-angle whistler-type modes. The whistlers grow to large amplitude, $\delta B/B_0\simeq 1$, and resonantly scatter the electrons, significantly reducing the heat flux. A surprise is that the resulting steady state heat flux is largely independent of the thermal gradient. The rate of thermal conduction is instead controlled by the finite propagation speed of the whistlers, which act as mobile scattering centers that convect the thermal energy of the hot reservoir. The results are relevant to thermal transport in high $\beta$ astrophysical plasmas such as hot accretion flows and the intracluster medium of galaxy clusters.

arXiv commentAccepted for publication in Physical Review Letters. 5 pages, 5 figures. Supplementary material: 1 page, 1 figure

References in corpus (16)

• Firehose and Mirror Instabilities in a Collisionless Shearing Plasma
• Particle Heating by Alfvenic Turbulence in Hot Accretion Flows
• Electron Heating in Hot Accretion Flows
• A thermally stable heating mechanism for the intracluster medium: turbulence, magnetic fields and plasma instabilities
• Shaken and stirred: conduction and turbulence in clusters of galaxies
• Magnetorotational Turbulence and Dynamo in a Collisionless Plasma
• Electron heat conduction in the solar wind: transition from Spitzer-Härm to the collisionless limit
• Interplay among Cooling, AGN Feedback and Anisotropic Conduction in the Cool Cores of Galaxy Clusters
• Electron Heating by the Ion Cyclotron Instability in Collisionless Accretion Flows. I. Compression-Driven Instabilities and the Electron Heating Mechanism
• Suppression of electron thermal conduction in the high $\beta$ intracluster medium of galaxy clusters
• PIC Simulations of the Effect of Velocity Space Instabilities on Electron Viscosity and Thermal Conduction
• Suppression of thermal conduction in a mirror-unstable plasma
• Nonlinear mirror instability
• Magnetofluid dynamics of magnetized cosmic plasma: firehose and gyrothermal instabilities
• Electron Heating by the Ion Cyclotron Instability in Collisionless Accretion Flows. II. Electron Heating Efficiency as a Function of Flow Conditions
• Diffusion and Radiation in Magnetized Collisionless Plasmas with High-Frequency Small-Scale Turbulence

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