# ANALYTIC FORMS OF THE PERPENDICULAR DIFFUSION COEFFICIENT IN NRMHD TURBULENCE

## Abstract

In the past different analytic limits for the perpendicular diffusion coefficient of energetic particles interacting with magnetic turbulence were discussed. These different limits or cases correspond to different transport modes describing how the particles are diffusing across the large-scale magnetic field. In the current paper we describe a new transport regime by considering the model of noisy reduced magnetohydrodynamic turbulence. We derive different analytic forms of the perpendicular diffusion coefficient, and while we do this, we focus on the aforementioned new transport mode. We show that for this turbulence model a small perpendicular diffusion coefficient can be obtained so that the latter diffusion coefficient is more than hundred times smaller than the parallel diffusion coefficient. This result is relevant to explain observations in the solar system where such small perpendicular diffusion coefficients have been reported.

- Authors:

- Department of Physics and Astronomy, University of Manitoba, Winnipeg, MB R3T 2N2 (Canada)

- Publication Date:

- OSTI Identifier:
- 22364317

- Resource Type:
- Journal Article

- Resource Relation:
- Journal Name: Astrophysical Journal; Journal Volume: 799; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DIFFUSION; MAGNETIC FIELD CONFIGURATIONS; MAGNETIC FIELDS; SOLAR SYSTEM; TURBULENCE

### Citation Formats

```
Shalchi, A., E-mail: andreasm4@yahoo.com.
```*ANALYTIC FORMS OF THE PERPENDICULAR DIFFUSION COEFFICIENT IN NRMHD TURBULENCE*. United States: N. p., 2015.
Web. doi:10.1088/0004-637X/799/2/232.

```
Shalchi, A., E-mail: andreasm4@yahoo.com.
```*ANALYTIC FORMS OF THE PERPENDICULAR DIFFUSION COEFFICIENT IN NRMHD TURBULENCE*. United States. doi:10.1088/0004-637X/799/2/232.

```
Shalchi, A., E-mail: andreasm4@yahoo.com. Sun .
"ANALYTIC FORMS OF THE PERPENDICULAR DIFFUSION COEFFICIENT IN NRMHD TURBULENCE". United States.
doi:10.1088/0004-637X/799/2/232.
```

```
@article{osti_22364317,
```

title = {ANALYTIC FORMS OF THE PERPENDICULAR DIFFUSION COEFFICIENT IN NRMHD TURBULENCE},

author = {Shalchi, A., E-mail: andreasm4@yahoo.com},

abstractNote = {In the past different analytic limits for the perpendicular diffusion coefficient of energetic particles interacting with magnetic turbulence were discussed. These different limits or cases correspond to different transport modes describing how the particles are diffusing across the large-scale magnetic field. In the current paper we describe a new transport regime by considering the model of noisy reduced magnetohydrodynamic turbulence. We derive different analytic forms of the perpendicular diffusion coefficient, and while we do this, we focus on the aforementioned new transport mode. We show that for this turbulence model a small perpendicular diffusion coefficient can be obtained so that the latter diffusion coefficient is more than hundred times smaller than the parallel diffusion coefficient. This result is relevant to explain observations in the solar system where such small perpendicular diffusion coefficients have been reported.},

doi = {10.1088/0004-637X/799/2/232},

journal = {Astrophysical Journal},

number = 2,

volume = 799,

place = {United States},

year = {Sun Feb 01 00:00:00 EST 2015},

month = {Sun Feb 01 00:00:00 EST 2015}

}