# PARTICLE ACCELERATION AND HEATING BY TURBULENT RECONNECTION

## Abstract

Turbulent flows in the solar wind, large-scale current sheets, multiple current sheets, and shock waves lead to the formation of environments in which a dense network of current sheets is established and sustains “turbulent reconnection.” We constructed a 2D grid on which a number of randomly chosen grid points are acting as scatterers (i.e., magnetic clouds or current sheets). Our goal is to examine how test particles respond inside this large-scale collection of scatterers. We study the energy gain of individual particles, the evolution of their energy distribution, and their escape time distribution. We have developed a new method to estimate the transport coefficients from the dynamics of the interaction of the particles with the scatterers. Replacing the “magnetic clouds” with current sheets, we have proven that the energization processes can be more efficient depending on the strength of the effective electric fields inside the current sheets and their statistical properties. Using the estimated transport coefficients and solving the Fokker–Planck (FP) equation, we can recover the energy distribution of the particles only for the stochastic Fermi process. We have shown that the evolution of the particles inside a turbulent reconnecting volume is not a solution of the FP equation, sincemore »

- Authors:

- Department of Physics, Aristotle University of Thessaloniki, GR-52124 Thessaloniki (Greece)
- Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens, GR-15236 Penteli (Greece)

- Publication Date:

- OSTI Identifier:
- 22654257

- Resource Type:
- Journal Article

- Resource Relation:
- Journal Name: Astrophysical Journal Letters; Journal Volume: 827; 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; ACCELERATION; COMPUTERIZED SIMULATION; DIFFUSION; DISTRIBUTION; ELECTRIC FIELDS; ENERGY SPECTRA; EVOLUTION; FOKKER-PLANCK EQUATION; HEATING; INTERACTIONS; MAGNETIC RECONNECTION; MATHEMATICAL SOLUTIONS; PARTICLES; RANDOMNESS; SHOCK WAVES; SOLAR WIND; STOCHASTIC PROCESSES; SUN; TURBULENCE; TURBULENT FLOW

### Citation Formats

```
Vlahos, Loukas, Pisokas, Theophilos, Isliker, Heinz, Tsiolis, Vassilis, and Anastasiadis, Anastasios.
```*PARTICLE ACCELERATION AND HEATING BY TURBULENT RECONNECTION*. United States: N. p., 2016.
Web. doi:10.3847/2041-8205/827/1/L3.

```
Vlahos, Loukas, Pisokas, Theophilos, Isliker, Heinz, Tsiolis, Vassilis, & Anastasiadis, Anastasios.
```*PARTICLE ACCELERATION AND HEATING BY TURBULENT RECONNECTION*. United States. doi:10.3847/2041-8205/827/1/L3.

```
Vlahos, Loukas, Pisokas, Theophilos, Isliker, Heinz, Tsiolis, Vassilis, and Anastasiadis, Anastasios. Wed .
"PARTICLE ACCELERATION AND HEATING BY TURBULENT RECONNECTION". United States. doi:10.3847/2041-8205/827/1/L3.
```

```
@article{osti_22654257,
```

title = {PARTICLE ACCELERATION AND HEATING BY TURBULENT RECONNECTION},

author = {Vlahos, Loukas and Pisokas, Theophilos and Isliker, Heinz and Tsiolis, Vassilis and Anastasiadis, Anastasios},

abstractNote = {Turbulent flows in the solar wind, large-scale current sheets, multiple current sheets, and shock waves lead to the formation of environments in which a dense network of current sheets is established and sustains “turbulent reconnection.” We constructed a 2D grid on which a number of randomly chosen grid points are acting as scatterers (i.e., magnetic clouds or current sheets). Our goal is to examine how test particles respond inside this large-scale collection of scatterers. We study the energy gain of individual particles, the evolution of their energy distribution, and their escape time distribution. We have developed a new method to estimate the transport coefficients from the dynamics of the interaction of the particles with the scatterers. Replacing the “magnetic clouds” with current sheets, we have proven that the energization processes can be more efficient depending on the strength of the effective electric fields inside the current sheets and their statistical properties. Using the estimated transport coefficients and solving the Fokker–Planck (FP) equation, we can recover the energy distribution of the particles only for the stochastic Fermi process. We have shown that the evolution of the particles inside a turbulent reconnecting volume is not a solution of the FP equation, since the interaction of the particles with the current sheets is “anomalous,” in contrast to the case of the second-order Fermi process.},

doi = {10.3847/2041-8205/827/1/L3},

journal = {Astrophysical Journal Letters},

number = 1,

volume = 827,

place = {United States},

year = {Wed Aug 10 00:00:00 EDT 2016},

month = {Wed Aug 10 00:00:00 EDT 2016}

}