The Velocity-Space Signature of Transit-Time Damping

Abstract

Transit-time damping (TTD) is a process in which the magnetic mirror force -- induced by the parallel gradient of magnetic field strength -- interacts with resonant plasma particles in a time-varying magnetic field, leading to the collisionless damping of electromagnetic waves and the resulting energization of those particles through the perpendicular component of the electric field, $E_{\perp }$. In this study, we utilize the recently developed field-particle correlation technique to analyze gyrokinetic simulation data. This method enables the identification of the velocity-space structure of the TTD energy transfer rate between waves and particles during the damping of plasma turbulence. Our analysis reveals a unique bipolar pattern of energy transfer in velocity space characteristic of TTD. By identifying this pattern, we provide clear evidence of TTD's significant role in the damping of strong plasma turbulence. Additionally, we compare the TTD signature with that of Landau damping (LD). Although they both produce a bipolar pattern of phase-space energy density loss and gain about the parallel resonant velocity of the Alfvénic waves, they are mediated by different forces and exhibit different behaviors as $v_{\perp }\to 0$. We also explore how the dominant damping mechanism varies with ion plasma beta ${\beta }_i$, showing that TTD dominates over LD for ${\beta }_i>1$. This work deepens our understanding of the role of TTD in the damping of weakly collisional plasma turbulence and paves the way to seek the signature of TTD using \emph{in situ} spacecraft observations of turbulence in space plasmas.

arXiv comment15 figures

References in corpus (40)

• Astrophysical gyrokinetics: kinetic and fluid turbulent cascades in magnetized weakly collisional plasmas
• A Model of Turbulence in Magnetized Plasmas: Implications for the Dissipation Range in the Solar Wind
• Perpendicular Ion Heating by Low-Frequency Alfven-Wave Turbulence in the Solar Wind
• Astrophysical Gyrokinetics: Basic Equations and Linear Theory
• Kinetic Simulations of Magnetized Turbulence in Astrophysical Plasmas
• Gyrokinetic Simulations of Solar Wind Turbulence from Ion to Electron Scales
• Particle Heating by Alfvenic Turbulence in Hot Accretion Flows
• Evidence for Electron Landau Damping in Space Plasma Turbulence
• Scaling of the electron dissipation range of solar wind turbulence
• Current Sheets and Collisionless Damping in Kinetic Plasma Turbulence
• Linearized model Fokker-Planck collision operators for gyrokinetic simulations. I. Theory
• Role of magnetic reconnection in MHD turbulence
• Linearized model Fokker-Planck collision operators for gyrokinetic simulations. II. Numerical implementation and tests
• Alfven Wave Collisions, The Fundamental Building Block of Plasma Turbulence I: Asymptotic Solution
• A Weakened Cascade Model for Turbulence in Astrophysical Plasmas
• Disruption of Alfvénic turbulence by magnetic reconnection in a collisionless plasma
• Predicted Impacts of Proton Temperature Anisotropy on Solar Wind Turbulence
• Measuring Collisionless Damping in Heliospheric Plasmas using Field-Particle Correlations
• Validity of the Taylor Hypothesis for Linear Kinetic Waves in the Weakly Collisional Solar Wind
• AstroGK: Astrophysical Gyrokinetics Code
• Diagnosing collisionless energy transfer using field-particle correlations: gyrokinetic turbulence
• Stochastic Heating, Differential Flow, and the Alpha-to-Proton Temperature Ratio in the Solar Wind
• An Oscillating Langevin Antenna for Driving Plasma Turbulence Simulations
• A Prospectus on Kinetic Heliophysics
• Toward Astrophysical Turbulence in the Laboratory
• Spatially Localized Particle Energization by Landau Damping in Current Sheets Produced by Strong Alfven Wave Collisions
• The Dynamical Generation of Current Sheets in Astrophysical Plasma Turbulence
• On stochastic heating and its phase-space signatures in low-$\beta$ kinetic turbulence
• Diagnosing collisionless energy transfer using field-particle correlations: Alfven-Ion Cyclotron Turbulence
• The Enhancement of Proton Stochastic Heating in the near-Sun Solar Wind
• Energy Dissipation and Landau Damping in Two- and Three-Dimensional Plasma Turbulence
• Alfven Wave Collisions, The Fundamental Building Block of Plasma Turbulence II: Numerical Solution
• Alfven Wave Collisions, The Fundamental Building Block of Plasma Turbulence IV: Laboratory Experiment
• The Importance of Electron Landau Damping for the Dissipation of Turbulent Energy in Terrestrial Magnetosheath Plasma
• Temporal Intermittency of Energy Dissipation in Magnetohydrodynamic Turbulence
• Collisionless energy transfer in kinetic turbulence: field-particle correlations in Fourier space
• Nonlinear energy transfer and current sheet development in localized Alfven wavepacket collisions in the strong turbulence limit
• Alfven Wave Collisions, The Fundamental Building Block of Plasma Turbulence III: Theory for Experimental Design
• Kinetic Turbulence in Collisionless High-Beta Plasmas
• The Alfvenic nature of energy transfer mediation in localized, strongly nonlinear Alfven wavepacket collisions

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