Wave generation and heat flux suppression in astrophysical plasma systems

Abstract

Heat flux suppression in collisionless plasmas for a large range of plasma $\beta$ is explored using two-dimensional particle-in-cell simulations with a strong, sustained thermal gradient. We find that a transition takes place between whistler-dominated (high-$\beta$) and double-layer-dominated (low-$\beta$) heat flux suppression. Whistlers saturate at small amplitude in the low beta limit and are unable to effectively suppress the heat flux. Electrostatic double layers suppress the heat flux to a mostly constant factor of the free streaming value once this transition happens. The double layer physics is an example of ion-electron coupling and occurs on a scale of roughly the electron Debye length. The scaling of ion heating associated with the various heat flux driven instabilities is explored over the full range of $\beta$ explored. The range of plasma-$\beta$s studied in this work makes it relevant to the dynamics of a large variety of astrophysical plasmas, including the intracluster medium of galaxy clusters, hot accretion flows, stellar and accretion disk coronae, and the solar wind.

arXiv comment16 pages, 6 figures. Accepted for publication in Astrophys. J

References in corpus (33)

• Models of Galaxy Clusters with Thermal Conduction
• Stability, Instability, and "Backwards'' Transport in Accretion Disks"
• Buoyancy Instabilities in Weakly Magnetized Low Collisionality Plasmas
• Whistler mode waves and the electron heat flux in the solar wind: Cluster observations
• Electron Injection by Whistler Waves in Non-relativistic Shocks
• Shaken and stirred: conduction and turbulence in clusters of galaxies
• On viscosity, conduction and sound waves in the intracluster medium
• 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
• Relativistic electrons produced by foreshock disturbances
• Electron Heating by the Ion Cyclotron Instability in Collisionless Accretion Flows. I. Compression-Driven Instabilities and the Electron Heating Mechanism
• Thermal Instability in Clusters of Galaxies with Conduction
• Turbulent pitch-angle scattering and diffusive transport of hard-X-ray producing electrons in flaring coronal loops
• Suppression of electron thermal conduction in the high $\beta$ intracluster medium of galaxy clusters
• Suppression of electron thermal conduction by whistler turbulence in a sustained thermal gradient
• Self-inhibiting thermal conduction in high-beta, whistler-unstable plasma
• Clarifying the solar wind heat-flux instabilities
• PIC Simulations of the Effect of Velocity Space Instabilities on Electron Viscosity and Thermal Conduction
• Inefficient Driving of Bulk Turbulence by Active Galactic Nuclei in a Hydrodynamic Model of the Intracluster Medium
• Increasing blackhole feedback induced quenching with anisotropic thermal conduction
• Radio light curves during the passage of cloud G2 near Sgr A*
• Self Inhibiting Heat-Flux
• Electron Heating in Low Mach Number Perpendicular shocks. I. Heating Mechanism
• Suppression of AGN-Driven Turbulence by Magnetic Fields in a Magnetohydrodynamic Model of the Intracluster Medium
• Stability Analysis of Core-Strahl Electron Distributions in the Solar Wind
• Electron Heating by the Ion Cyclotron Instability in Collisionless Accretion Flows. II. Electron Heating Efficiency as a Function of Flow Conditions
• Suppression of energetic electron transport in flares by double layers
• Acoustic Disturbances in Galaxy Clusters
• Coronal Electron Confinement by Double Layers
• Dynamics of double layers, ion acceleration and heat flux suppression during solar flares
• Sound wave generation by a spherically symmetric outburst and AGN feedback in galaxy clusters II: impact of thermal conduction
• Stochastic Electron Acceleration by the Whistler Instability in a Growing Magnetic Field
• Diffusion and Radiation in Magnetized Collisionless Plasmas with High-Frequency Small-Scale Turbulence

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• Thermal-nonthermal energy partition in solar flares derived from X-ray, EUV, and bolometric observations
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• Precision Electron Measurements in the Solar Wind at 1 au from NASA's Wind Spacecraft
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