3D simulations of fluctuation spectra in the hall-MHD plasma.
3D simulations of fluctuation spectra in the hall-MHD plasma.
复制标题
霍尔 MHD 等离子体中涨落光谱的 3D 模拟。
DOI：
10.1103/physrevlett.102.045004
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发表时间：
2009
影响因子：
8.6
通讯作者：
P. Shukla
中科院分区：
文献类型：
--
作者：
D. Shaikh;P. Shukla
湍流光谱级联的研究通过全三维（3D）模拟的可压缩霍尔磁流体动力学（H-MHD）等离子体，以了解所观察到的光谱中断的太阳风湍流光谱的制度，与电磁波动的特征长度尺度小于离子回旋半径。在这种情况下，我们的三维模拟的结果表明，湍流谱级联在平均磁场的存在下，遵循一个全向各向异性的惯性范围的频谱接近k（-7/3）。后者与我们的三维H-MHD等离子体模型中电子和离子流体速度不相等所产生的霍尔电流有关。
Turbulent spectral cascades are investigated by means of fully three-dimensional (3D) simulations of a compressible Hall-magnetohydrodynamic (H-MHD) plasma in order to understand the observed spectral break in the solar wind turbulence spectra in the regime where the characteristic length scales associated with electromagnetic fluctuations are smaller than the ion gyroradius. In this regime, the results of our 3D simulations exhibit that turbulent spectral cascades in the presence of a mean magnetic field follow an omnidirectional anisotropic inertial-range spectrum close to k(-7/3). The latter is associated with the Hall current arising from nonequal electron and ion fluid velocities in our 3D H-MHD plasma model.