Trapping of cosmic rays in MHD turbulence
arXiv:2003.12593 · doi:10.3847/1538-4357/ab8465
Abstract
Astrophysical plasmas are turbulent and magnetized. The interaction between cosmic rays (CRs) and magnetohydrodynamic (MHD) turbulence is a fundamental astrophysical process. Based on the current understanding of MHD turbulence, we revisit the trapping of CRs by magnetic mirrors in the context of MHD turbulence. In compressible MHD turbulence, isotropic fast modes dominate both trapping and gyroresonant scattering of CRs. The presence of trapping significantly suppresses the pitch-angle scattering and the spatial diffusion of CRs along the magnetic field. The resulting parallel diffusion coefficient has a weaker dependence on CR energy at higher energies. In incompressible MHD turbulence, the trapping by pseudo-Alfvén modes dominates over the gyroresonant scattering by anisotropic Alfvén and pseudo-Alfvén modes at all pitch angles and prevents CRs from diffusion.
arXiv comment8 pages, 8 figures, accepted for publication in ApJ
References in corpus (39)
- Reconnection in a Weakly Stochastic Field
- The Anisotropy of MHD Alfvénic Turbulence
- Simulations of Incompressible MHD Turbulence
- Compressible Magnetohydrodynamic Turbulence: mode coupling, scaling relations, anisotropy, new regime and astrophysical implications
- Anisotropic scaling of magnetohydrodynamic turbulence
- Simulations of MHD Turbulence in a Strongly Magnetized Medium
- Compressible Turbulence in Galaxy Clusters: Physics and Stochastic Particle Re-acceleration
- Compressible Sub-Alfvenic MHD turbulence in Low-beta Plasmas
- Compressible MHD Turbulence in Interstellar Plasmas
- Scattering of Cosmic Rays by Magnetohydrodynamic Interstellar Turbulence
- Spectral breaks as a signature of cosmic ray induced turbulence in the Galaxy
- Cosmic Ray Scattering and Streaming in Compressible Magnetohydrodynamic Turbulence
- Cosmic Ray Propagation: Nonlinear Diffusion Parallel and Perpendicular to Mean Magnetic Field
- Supernova Driving. I. The Origin of Molecular Cloud Turbulence
- Scattering of energetic particles by anisotropic magnetohydrodynamic turbulence with a Goldreich-Sridhar power spectrum
- The origin of galactic cosmic rays
- Superdiffusion of Cosmic Rays: Implications for Cosmic Ray Acceleration
- Cosmic Ray Parallel and Perpendicular Transport in Turbulent Magnetic Fields
- Magnetization of cloud cores and envelopes and other observational consequences of reconnection diffusion
- Cosmic ray transport in starburst galaxies
- Numerical Simulations of Driven Relativistic MHD Turbulence
- Spectra of strong MHD Turbulence from high-resolution simulations
- On the formation of density filaments in the turbulent interstellar medium
- Reconnection Studies Under Different Types of Turbulence Driving
- Damping of MHD turbulence in partially ionized plasma: implications for cosmic ray propagation
- Magnetohydrodynamic-Particle-in-Cell Simulations of the Cosmic-Ray Streaming Instability: Linear Growth and Quasi-linear Evolution
- Simulation of Relativistic Force-free Magnetohydrodynamic Turbulence
- Particle acceleration in relativistic turbulence: A theoretical appraisal
- Turbulent Reconnection in Relativistic Plasmas And Effects of Compressibility
- On the Growth and Saturation of the Gyroresonant Streaming Instabilities
- Resonance-broadened transit time damping of particles in MHD turbulence
- On the parallel spectrum in MHD Turbulence
- Adiabatic non-resonant acceleration in magnetic turbulence and hard spectra of gamma-ray bursts
- Imbalanced Relativistic Force-Free Magnetohydrodynamic Turbulence
- Kinetic-MHD simulations of gyroresonance instability driven by CR pressure anisotropy
- Superdiffusive Stochastic Fermi Acceleration in Space and Energy
- On the synchrotron spectrum of GRB prompt emission
- The implicit contribution of slab modes to the perpendicular diffusion coefficient of particles interacting with two-component turbulence
- Asymmetric diffusion of cosmic rays
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- Diffusion of cosmic rays in MHD turbulence with magnetic mirrors
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- Cosmic ray streaming in the turbulent interstellar medium
- Shock acceleration with oblique and turbulent magnetic fields
- Turbulence and Particle Acceleration in Radiative Shock Waves in the Cygnus Loop II: Development of Postshock Turbulence
- Mirror diffusion of cosmic rays in highly compressible turbulence near supernova remnants
- Cosmic rays and random magnetic traps
- Cosmic ray diffusion in magnetic fields amplified by nonlinear turbulent dynamo
- On the injection scale of the turbulence in the partially ionized very local interstellar medium
- Cosmic Ray Diffusion in the Turbulent Interstellar Medium: Effects of Mirror Diffusion and Pitch Angle Scattering
- Chaotic Behavior of Trapped Cosmic Rays
- Diffusion of cosmic rays in MHD turbulence
- Interstellar filament detection and characterization: methods and implications for studies of magnetized interstellar medium