Evolution of plasma turbulence excited with particle beams

Evolution of plasma turbulence excited with particle beams
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粒子束激发等离子体湍流的演化

DOI:
10.1051/0004-6361/201219579
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发表时间:
2012
期刊:
arXiv: Solar and Stellar Astrophysics
影响因子:
--
通讯作者:
Spanier
Spanier
中科院分区:
--
文献类型:
--
作者:
Lange ;Spanier

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从太阳喷射出来的粒子穿过周围的太阳风等离子体,造成了不稳定性。这些在一定的频率范围内产生波模,特别是在激波区域内,粒子被加速。本文的目的是研究驱动不可压缩磁流体动力学湍流中的放大Alfvénic波模。从各向同性和各向异性等离子体,以及湍流附近的临界平衡不同的日光层方案的结果。放大波模的能量输运受波数空间中能量的扩散、对流和耗散机制支配。这些效应的强度随所讨论的模式的能量和波数而变化。二维能谱的sphericalk空间整合,允许详细了解thek/k-发展。通过驱动注入的能量的演变显示出强烈的能量转移到垂直波模。平行波模的主要过程是能量在波数空间中的耗散。观察到高次谐波沿着k轴的产生。我们在模拟中找到了临界平衡的证据。
Particles ejected from the Sun that stream through the surrounding plasma of the solar wind are causing instabilities. These generate wavemodes in a certain frequency range especially within shock regions, where particles are accelerated. The aim of this paper is to investigate of amplified Alfvénic wavemodes in driven incompressible magnetohydrodynamic turbulence. Results of different heliospheric scenarios from isotropic and anisotropic plasmas, as well as turbulence near thecritical balanceare shown. The energy transport of the amplified wavemode is governed by the mechanisms of diffusion, convection and dissipation of energy in wavenumber space. The strength of these effects varies with energy and wavenumber of the mode in question. Two-dimensional energy spectra of sphericalk-space integration that permit detailed insight into thek∥/k⊥-development are presented. The evolution of energy injected through driving shows a strong energy transfer to perpendicular wavemodes. The main process at parallel wavemodes is the dissipation of energy in wavenumber space. The generation of higher harmonics along thek∥axis is observed. We find evidence for a critical balance in our simulations.
DOI: 10.1051/0004-6361:20030822
发表时间: 2003
影响因子: 6.5
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通讯作者: R. Vainio
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DOI: --
发表时间: 2007
期刊:
影响因子: --
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DOI: --
发表时间: 1997
期刊:
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DOI: --
发表时间: 2002
期刊: Physical review. E, Statistical, nonlinear, and soft matter physics
影响因子: --
作者:
A. Bershadskii
通讯作者: A. Bershadskii