# Global diffusion of cosmic rays in random magnetic fields

@article{Snodin2015GlobalDO, title={Global diffusion of cosmic rays in random magnetic fields}, author={A. P. Snodin and Anvar Shukurov and Graeme R. Sarson and Paul J. Bushby and Ladkrabang Bangkok and Thailand and New Mexico State University and UK.}, journal={Monthly Notices of the Royal Astronomical Society}, year={2015}, volume={457}, pages={3975-3987} }

The propagation of charged particles, including cosmic rays, in a partially ordered magnetic field is characterized by a diffusion tensor whose componentsdepend on the particle’s Larmor radius RL and the degree of order in the magnetic field. Most studies of the particle diffusion presuppose a scale separation between the mean and random magnetic fields (e.g., there being a pronounced minimum in the magnetic power spectrum at intermediate scales). Scale separation is often a good approximation…

## 39 Citations

### Regimes of cosmic-ray diffusion in Galactic turbulence

- PhysicsSN Applied Sciences
- 2021

It is shown that simple purely diffusive transport is in conflict with observations of the inner Galaxy, but that just by taking a Galactic wind into account, data can be matched in the central 5 kpc zone.

### Relative distribution of cosmic rays and magnetic fields

- Physics
- 2018

Synchrotron radiation from cosmic rays is a key observational probe of the galactic magnetic field. Interpreting synchrotron emission data requires knowledge of the cosmic ray number density, which…

### Test particle simulations of cosmic rays

- PhysicsAstrophysics and Space Science
- 2020

Modelling of cosmic ray transport and interpretation of cosmic ray data ultimately rely on a solid understanding of the interactions of charged particles with turbulent magnetic fields. The paradigm…

### A signature of anisotropic cosmic-ray transport in the gamma-ray sky

- Physics
- 2017

A crucial process in Galactic cosmic-ray (CR) transport is the spatial diffusion due to the interaction with the interstellar turbulent magnetic field. Usually, CR diffusion is assumed to be uniform…

### Transport of charged particles in turbulent magnetic fields

- Physics
- 2017

Magnetic fields permeate the Universe. They are found in planets, stars, galaxies, and the intergalactic medium. The magnetic field found in these astrophysical systems are usually chaotic,…

### Transport of Charged Particles Propagating in Turbulent Magnetic Fields as a Red-noise Process

- PhysicsThe Astrophysical Journal
- 2021

The transport of charged particles in various astrophysical environments permeated by magnetic fields is described in terms of a diffusion process, which relies on diffusion-tensor parameters…

### Two Numerical Methods for the 3D Anisotropic Propagation of Galactic Cosmic Rays

- PhysicsThe Astrophysical Journal
- 2020

Conventional cosmic-ray propagation models usually assume an isotropic diffusion coefficient to account for the random deflection of cosmic rays by the turbulent interstellar magnetic field. Such…

### Cosmic-Ray Diffusion and Galactic Magnetic Field Models

- PhysicsProceedings of 36th International Cosmic Ray Conference — PoS(ICRC2019)
- 2019

We calculate numerically the parallel and perpendicular diffusion coefficients of cosmic-rays (CR) propagating in regular and turbulent magnetic fields. For isotropic turbulence, and in the absence…

### Novel aspects of cosmic ray diffusion in synthetic magnetic turbulence

- Physics
- 2020

The diffusive motion of charged particles in synthetic magnetic turbulence with different properties is investigated by using numerical simulations with unprecedented dynamical range, which allow us…

### Reconciling cosmic ray diffusion with Galactic magnetic field models

- PhysicsJournal of Cosmology and Astroparticle Physics
- 2018

We calculate the diffusion coefficients of charged cosmic rays (CR) propagating in regular and turbulent magnetic fields. If the magnetic field is dominated by an isotropic turbulent component, we…

## References

SHOWING 1-10 OF 75 REFERENCES

### Transport of cosmic rays in chaotic magnetic fields

- Physics
- 2001

The transport of charged particles in disorganised magnetic fields is an important issue which concerns the propagation of cosmic rays of all energies in a variety of astrophysical environments, such…

### Simulating field-aligned diffusion of a cosmic ray gas

- Physics
- 2006

The macroscopic behaviour of cosmic rays in turbulent magnetic fields is discussed. An implementation of anisotropic diffusion of cosmic rays with respect to the magnetic field in a non-conservative,…

### The Transport of Cosmic Rays across a Turbulent Magnetic Field

- Physics
- 1999

We present a new analysis of the transport of cosmic rays in a turbulent magnetic field that varies in all three spatial dimensions. The analysis utilizes a numerical simulation that integrates the…

### HIGH-ENERGY COSMIC-RAY DIFFUSION IN MOLECULAR CLOUDS: A NUMERICAL APPROACH

- Physics
- 2010

The propagation of high-energy cosmic rays (CRs) through giant molecular clouds constitutes a fundamental process in astronomy and astrophysics. The diffusion of CRs through these magnetically…

### Numerical propagation of high energy cosmic rays in the Galaxy: I. Technical issues

- Physics
- 2007

We present the results of a numerical simulation of propagation of cosmic rays with energy above 1015 eV in a complex magnetic field, made in general of a large scale component and a turbulent…

### An observational test for correlations between cosmic rays and magnetic fields

- Physics
- 2014

We derive the magnitude of fluctuations in total synchrotron intensity in the Milky Way, both from observations and from theory under various assumption about the relation between cosmic rays and…

### Particle transport in intense small-scale magnetic turbulence with a mean field

- Physics
- 2011

Various astrophysical studies have motivated the investigation of the transport of high energy particles in magnetic turbulence, either in the source or en route to the observation sites. For strong…

### Propagation of high-energy cosmic rays in extragalactic turbulent magnetic fields: resulting energy spectrum and composition

- Physics
- 2008

We extend previous studies of mixed-composition extragalactic cosmic-ray source models, investigating the influence of a nonnegligible extragalactic magnetic field on the propagated cosmic-ray…

### Diffusive Propagation of Ultra-High-Energy Cosmic Rays and the Propagation Theorem

- Physics
- 2004

We present a detailed analytical study of the propagation of ultra-high-energy (UHE) particles in extragalactic magnetic fields. The crucial parameter that affects the diffuse spectrum is the…

### MAGNETIC FIELD LINE RANDOM WALK IN ISOTROPIC TURBULENCE WITH ZERO MEAN FIELD

- Physics
- 2014

In astrophysical plasmas, magnetic field lines often guide the motions of thermal and non-thermal particles. The field line random walk (FLRW) is typically considered to depend on the Kubo number R =…