Electron Surfing and Drift Accelerations in a Weibel-dominated High-Mach-number Shock

Abstract

How electrons get accelerated to relativistic energies in a high-Mach-number quasi-perpendicular shock is presented by means of ab initio particle-in-cell simulations in three dimensions. We found that coherent electrostatic Buneman waves and ion-Weibel magnetic turbulence coexist in a strong-shock structure whereby particles gain energy during shock-surfing and subsequent stochastic drift accelerations. Energetic electrons that initially experienced the surfing acceleration undergo pitch-angle diffusion by interacting with magnetic turbulence and continuous acceleration during confinement in the shock transition region. The ion-Weibel turbulence is the key to the efficient nonthermal electron acceleration.

5 pages, 4 figures

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• PIC Simulation Methods for Cosmic Radiation and Plasma Instabilities
• First-principles Fermi acceleration in magnetized turbulence
• Kinetic simulations of nonrelativistic perpendicular shocks of young supernova remnants. I. Electron shock-surfing acceleration
• Theory of Electron Injection at Oblique Shock of Finite Thickness
• Electron Acceleration at Rippled Low-Mach-number Shocks in High-beta Collisionless Cosmic Plasmas
• Non-thermal emission from the reverse shock of the youngest galactic Supernova remnant G1.9+0.3
• Time evolution of broadband non-thermal emission from supernova remnants in different circumstellar environments
• Kinetic Simulations of the Filamentation Instability in Pair Plasmas
• Stochastic re-acceleration and magnetic-field damping in Tycho's supernova remnant
• Mach Number Dependence of Ion-scale Kinetic Instability at Collisionless Perpendicular Shock: Condition for Weibel-dominated Shock
• Diffusive shock acceleration at oblique high Mach number shocks
• Efficient generation of turbulent collisionless shocks in laser-ablated counter-streaming plasmas
• A Jet Source of Event Horizon Telescope Correlated Flux in M87
• Electron Energization in Quasi-Parallel Shocks: Test-Particle-Electrons in a Proton Driven Turbulence
• Evolution of three-dimensional Relativistic Ion Weibel Instability: Competition with Kink Instability
• The Efficiency of Coherent Radiation from Relativistic Shocks
• Plasmas in Gamma-Ray Bursts: particle acceleration, magnetic fields, radiative Processes and environments
• The electron foreshock at high-Mach-number nonrelativistic oblique shocks
• Morphology of supernova remnants and their halos