Evolution of Three-dimensional Relativistic Ion Weibel Instability: Competition with Kink Instability

被引：2

作者：

Takamoto, Makoto ^{[1
,2
]}

Matsumoto, Yosuke ^{[3
]}

Kato, Tsunehiko N. ^{[4
]}

机构：

[1] NEC Corp Ltd, Cent Res Labs, Nakahara Ku, 1753 Shimonumabe, Kawasaki, Kanagawa 2118666, Japan

[2] Univ Tokyo, Dept Earth & Planetary Sci, Bunkyo Ku, Tokyo 1130033, Japan

[3] Chiba Univ, Dept Phys, Inage Ku, 1-33 Yayoi Cho, Chiba 2638522, Japan

[4] Natl Astron Observ Japan, Ctr Computat Astrophys, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan

来源：

ASTROPHYSICAL JOURNAL | 2019年 / 877卷 / 02期

基金：

日本学术振兴会;

关键词：

gamma-ray burst: general; instabilities; magnetic fields; methods: numerical; plasmas; relativistic processes; COLLISIONLESS SHOCKS; PLASMAS; ACCELERATION; GENERATION; MECHANISM;

D O I：

10.3847/1538-4357/ab1911

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In this paper, we report our recent findings on the relativistic Weibel instability and its nonlinear saturation by performing numerical simulations of collisionless plasmas. Analysis of the obtained numerical results revealed that the nonlinear phase of the Weibel instability can be described by characteristic phases based on the Weibel filaments' current density in terms of particle and Alfven limit currents. We also analyzed the relativistic kink instability based on the energy principle in the magnetohydrodynamic (MHD) regime, and found that the Weibel filaments do not suffer from the kink-type instability in the MHD regime up to 1000 omega(-1)(p,i). This finding allowed a magnetic field to be sustained by relativistic Weibel instability that was stable enough to be a seed for MHD dynamos.

引用

页数：9

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