太阳风Turbulence从离子尺度到电子尺度的回旋动力学模拟
Gyrokinetic Simulations of Solar Wind Turbulence from Ion to Electron Scales
摘要：
第一个三维的，非线性gyrokinetic模拟等离子体湍流解决尺度从离子到电子gyroradius与现实的质量比，所有的阻尼提供解决的物理机制。由此产生的能量谱是定量一致的磁功率谱缩放的$k^{-2.8}$观测到的\emph{in situ}航天器测量的“耗散范围”的太阳风湍流。尽管湍流具有很强的非线性性质，线性动力学\Alfven波模式定量地描述了湍流波动的偏振。在亚离子Larmor半径尺度上测量了碰撞离子加热，这为电磁湍流模拟中的离子熵级联提供了第一个证据。
英文摘要：
The first three-dimensional, nonlinear gyrokinetic simulation of plasma turbulence resolving scales from the ion to electron gyroradius with a realistic mass ratio is presented, where all damping is provided by resolved physical mechanisms. The resulting energy spectra are quantitatively consistent with a magnetic power spectrum scaling of $k^{-2.8}$ as observed in \emph{in situ} spacecraft measurements of the "dissipation range" of solar wind turbulence. Despite the strongly nonlinear nature of the turbulence, the linear kinetic \Alfven wave mode quantitatively describes the polarization of the turbulent fluctuations. The collisional ion heating is measured at sub-ion-Larmor radius scales, which provides the first evidence of the ion entropy cascade in an electromagnetic turbulence simulation.
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