# Linear growth rates of resistive tearing modes with sub-Alfvénic streaming flow

## Abstract

The tearing instability with sub-Alfvénic streaming flow along the external magnetic field is investigated using resistive MHD simulation. It is found that the growth rate of the tearing mode instability is larger than that without the streaming flow. With the streaming flow, there exist two Alfvén resonance layers near the central current sheet. The larger perturbation of the magnetic field in two closer Alfvén resonance layers could lead to formation of the observed cone structure and can largely enhance the development of the tearing mode for a narrower streaming flow. For a broader streaming flow, a larger separation of Alfvén resonance layers reduces the magnetic reconnection. The linear growth rate decreases with increase of the streaming flow thickness. The growth rate of the tearing instability also depends on the plasma beta (β). When the streaming flow is embedded in the current sheet, the growth rate increases with β if β < β{sub s}, but decreases if β > β{sub s}. The existence of the specific value β{sub s} can be attributed to competition between the suppressing effect of β and the enhancing effect of the streaming flow on the magnetic reconnection. The critical value β{sub s} increases with increase of the streaming flow strength.

- Authors:

- Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027 (China)
- (China)

- Publication Date:

- OSTI Identifier:
- 22304073

- Resource Type:
- Journal Article

- Resource Relation:
- Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 7; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CONES; MAGNETIC FIELDS; MAGNETIC RECONNECTION; MAGNETOHYDRODYNAMICS; PLASMA; SIMULATION; TEARING INSTABILITY

### Citation Formats

```
Wu, L. N., College of Sciences, China Jiliang University, Hangzhou 310018, and Ma, Z. W., E-mail: zwma@zju.edu.cn.
```*Linear growth rates of resistive tearing modes with sub-Alfvénic streaming flow*. United States: N. p., 2014.
Web. doi:10.1063/1.4886360.

```
Wu, L. N., College of Sciences, China Jiliang University, Hangzhou 310018, & Ma, Z. W., E-mail: zwma@zju.edu.cn.
```*Linear growth rates of resistive tearing modes with sub-Alfvénic streaming flow*. United States. doi:10.1063/1.4886360.

```
Wu, L. N., College of Sciences, China Jiliang University, Hangzhou 310018, and Ma, Z. W., E-mail: zwma@zju.edu.cn. Tue .
"Linear growth rates of resistive tearing modes with sub-Alfvénic streaming flow". United States.
doi:10.1063/1.4886360.
```

```
@article{osti_22304073,
```

title = {Linear growth rates of resistive tearing modes with sub-Alfvénic streaming flow},

author = {Wu, L. N. and College of Sciences, China Jiliang University, Hangzhou 310018 and Ma, Z. W., E-mail: zwma@zju.edu.cn},

abstractNote = {The tearing instability with sub-Alfvénic streaming flow along the external magnetic field is investigated using resistive MHD simulation. It is found that the growth rate of the tearing mode instability is larger than that without the streaming flow. With the streaming flow, there exist two Alfvén resonance layers near the central current sheet. The larger perturbation of the magnetic field in two closer Alfvén resonance layers could lead to formation of the observed cone structure and can largely enhance the development of the tearing mode for a narrower streaming flow. For a broader streaming flow, a larger separation of Alfvén resonance layers reduces the magnetic reconnection. The linear growth rate decreases with increase of the streaming flow thickness. The growth rate of the tearing instability also depends on the plasma beta (β). When the streaming flow is embedded in the current sheet, the growth rate increases with β if β < β{sub s}, but decreases if β > β{sub s}. The existence of the specific value β{sub s} can be attributed to competition between the suppressing effect of β and the enhancing effect of the streaming flow on the magnetic reconnection. The critical value β{sub s} increases with increase of the streaming flow strength.},

doi = {10.1063/1.4886360},

journal = {Physics of Plasmas},

number = 7,

volume = 21,

place = {United States},

year = {Tue Jul 15 00:00:00 EDT 2014},

month = {Tue Jul 15 00:00:00 EDT 2014}

}