Magnetic field amplification by the Weibel instability at planetary and astrophysical high-Mach-number shocks
arXiv:2102.04328 · doi:10.1103/PhysRevLett.126.095101
Abstract
Collisionless shocks are ubiquitous in the Universe and often associated with strong magnetic field. Here we use large-scale particle-in-cell simulations of non-relativistic perpendicular shocks in the high-Mach-number regime to study the amplification of magnetic field within shocks. The magnetic field is amplified at the shock transition due to the ion-ion two-stream Weibel instability. The normalized magnetic-field strength strongly correlates with the Alfvénic Mach number. Mock spacecraft measurements derived from PIC simulations are fully consistent with those taken in-situ at Saturn's bow shock by the Cassini spacecraft.
Accepted to PRL. 7 pages, 4 figure
References in corpus (8)
- Production of Magnetic Turbulence by Cosmic Rays Drifting Upstream of Supernova Remnant Shocks
- Electron Surfing and Drift Accelerations in a Weibel-dominated High-Mach-number Shock
- Nonrelativistic collisionless shocks in weakly magnetized electron--ion plasmas: two-dimensional particle-in-cell simulation of perpendicular shock
- Theory of Stochastic Shock Drift Acceleration for Electrons in the Shock Transition Region
- Electron Pre-Acceleration at Nonrelativistic High-Mach-Number Perpendicular Shocks
- Kinetic simulations of nonrelativistic perpendicular shocks of young supernova remnants. I. Electron shock-surfing acceleration
- Dynamics of Mesoscale Magnetic Field in Diffusive Shock Acceleration
- Cosmic-ray pressure driven magnetic field amplification: dimensional, radiative and field orientation effects
Cited by in corpus (6)
- Electron-Ion Temperature Ratio in Astrophysical Shocks
- Theory of Electron Injection at Oblique Shock of Finite Thickness
- Lagrangian statistics of a shock-driven turbulent dynamo in decaying turbulence
- Mach Number Dependence of Ion-scale Kinetic Instability at Collisionless Perpendicular Shock: Condition for Weibel-dominated Shock
- A MeerKAT look at the polarization of 47 Tucanae pulsars: magnetic field implications
- Drivers of Magnetic Field Amplification at Oblique Shocks: In-Situ Observations