Explosive Growth of Large-Scale Magnetic Fluctuations due to Particle Scattering on Developed Small-Scale Weibel Turbulence in a Magnetoactive Plasma

IF 1.3 4区 物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY
N. A. Emelyanov, Vl. V. Kocharovsky
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引用次数: 0

Abstract

An analytical theory of nonlinear generation of large-scale magnetic turbulence in an anisotropic magnetoactive plasma in a quasilinear approximation disregarding the direct nonlinear interaction of individual harmonics has been constructed. It has been shown that anomalous particle collisions caused by scattering on small-scale fluctuations of developed Weibel turbulence lead to the instability of long-wavelength harmonics stable in the linear approximation. The nonlinear growth of such harmonics at a given anisotropy of the particle velocity distribution, which is consistent with short-wavelength turbulence at the saturation stage and possible anisotropic injection of particles, occurs in the superexponential regime and corresponds to the explosive instability. The increase law of the large-scale field has been found and the critical explosion time has been determined.

磁活性等离子体中小尺度威贝尔湍流中粒子散射引起的大尺度磁波动的爆炸增长
本文建立了考虑各向异性磁活性等离子体中各次谐波直接非线性相互作用的拟线性近似下大尺度磁湍流非线性产生的解析理论。研究表明,在发展的威贝尔湍流的小尺度波动上散射引起的反常粒子碰撞导致了在线性近似下稳定的长波长谐波的不稳定性。这些谐波在粒子速度分布的各向异性下的非线性增长,与饱和阶段的短波湍流和粒子可能的各向异性注入相一致,发生在超指数区,对应于爆炸不稳定性。发现了大尺度场的增大规律,确定了临界爆炸时间。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
JETP Letters
JETP Letters 物理-物理:综合
CiteScore
2.40
自引率
30.80%
发文量
164
审稿时长
3-6 weeks
期刊介绍: All topics of experimental and theoretical physics including gravitation, field theory, elementary particles and nuclei, plasma, nonlinear phenomena, condensed matter, superconductivity, superfluidity, lasers, and surfaces.
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