受驱动耗散等离子体系统的自组织
Self-Organization in a Driven Dissipative Plasma System
摘要：
我们执行一个完全自洽的3-D数值模拟的可压缩，耗散磁等离子体驱动的大尺度扰动，包含一个相当广泛的频谱的特征模式，从最大尺度到中间尺度和最小的尺度，其中系统的能量耗散碰撞（欧姆）和粘性耗散。此外，我们的模拟包括用随机光谱振幅初始化的大范围波动之间的非线性相互作用，导致惯性范围光谱中的光谱能量级联，并考虑了可能由背景等离子体波动引起的大尺度和小尺度扰动，能量的非绝热交换也导致能量从含能模式或随机注入能量中迁移，这些能量由扰动驱动并进一步被较小的尺度耗散。结果表明，自组织态的总能量和能量耗散率随时间的衰减比较明显，同时还存在一个垂直分量的电流，从而明确地证实了自组织态是非力自由态。
英文摘要：
We perform a fully self-consistent 3-D numerical simulation for a compressible, dissipative magneto-plasma driven by large-scale perturbations, that contain a fairly broader spectrum of characteristic modes, ranging from largest scales to intermediate scales and down to the smallest scales, where the energy of the system are dissipated by collisional (Ohmic) and viscous dissipations. Additionally, our simulation includes nonlinear interactions amongst a wide range of fluctuations that are initialized with random spectral amplitudes, leading to the cascade of spectral energy in the inertial range spectrum, and takes into account large scale as well as small scale perturbation that may have been induced by the background plasma fluctuations, also the non adiabatic exchange of energy leading to the migration of energy from the energy containing modes or randomly injected energy driven by perturbations and further dissipated by the smaller scales. Besides demonstrating the comparative decays of total energy and dissipation rate of energy, our results show the existence of a perpendicular component of current, thus clearly confirming that the self-organized state is non-force free.
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