# Diffusion and stochastic island generation in the magnetic field line random walk

## Abstract

The cross-field diffusion of field lines in stochastic magnetic fields described by the 2D+slab model is studied using a semi-analytic statistical approach, the decorrelation trajectory method. We show that field line trapping and the associated stochastic magnetic islands strongly influence the diffusion coefficients, leading to dependences on the parameters that are different from the quasilinear and Bohm regimes. A strong amplification of the diffusion is produced by a small slab field in the presence of trapping. The diffusion regimes are determined and the corresponding physical processes are identified.

- Authors:

- National Institute of Laser, Plasma and Radiation Physics, Atomistilor 409, 077125 Magurele, Bucharest (Romania)

- Publication Date:

- OSTI Identifier:
- 22365378

- Resource Type:
- Journal Article

- Resource Relation:
- Journal Name: Astrophysical Journal; Journal Volume: 791; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AMPLIFICATION; COSMIC RADIATION; DIFFUSION; GRAPH THEORY; MAGNETIC FIELDS; MAGNETIC ISLANDS; RANDOMNESS; SOLAR WIND; STOCHASTIC PROCESSES; TRAJECTORIES; TRAPPING; TURBULENCE; TWO-DIMENSIONAL CALCULATIONS

### Citation Formats

```
Vlad, M., and Spineanu, F.
```*Diffusion and stochastic island generation in the magnetic field line random walk*. United States: N. p., 2014.
Web. doi:10.1088/0004-637X/791/1/56.

```
Vlad, M., & Spineanu, F.
```*Diffusion and stochastic island generation in the magnetic field line random walk*. United States. doi:10.1088/0004-637X/791/1/56.

```
Vlad, M., and Spineanu, F. Sun .
"Diffusion and stochastic island generation in the magnetic field line random walk". United States.
doi:10.1088/0004-637X/791/1/56.
```

```
@article{osti_22365378,
```

title = {Diffusion and stochastic island generation in the magnetic field line random walk},

author = {Vlad, M. and Spineanu, F.},

abstractNote = {The cross-field diffusion of field lines in stochastic magnetic fields described by the 2D+slab model is studied using a semi-analytic statistical approach, the decorrelation trajectory method. We show that field line trapping and the associated stochastic magnetic islands strongly influence the diffusion coefficients, leading to dependences on the parameters that are different from the quasilinear and Bohm regimes. A strong amplification of the diffusion is produced by a small slab field in the presence of trapping. The diffusion regimes are determined and the corresponding physical processes are identified.},

doi = {10.1088/0004-637X/791/1/56},

journal = {Astrophysical Journal},

number = 1,

volume = 791,

place = {United States},

year = {Sun Aug 10 00:00:00 EDT 2014},

month = {Sun Aug 10 00:00:00 EDT 2014}

}

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