The Role of Electron Density in Magnetic Turbulence
The Role of Electron Density in Magnetic Turbulence
复制标题
电子密度在磁湍流中的作用
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
E. Fernandez
中科院分区：
文献类型：
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作者：
P. Terry;C. McKay;E. Fernandez
对电子密度演化增强的强各向异性磁流体湍流的惯性范围能量传递、解相关和能谱进行了分析和数值研究。该模型适用于星际湍流和聚变装置中的磁湍流。对于长波（与离子陀螺半径相比），磁场和动能通过在阿尔夫尼时间尺度上去相关的相互作用均分。在涡旋时间尺度上，内能传递受平流和去相关控制。对于短波长，内能和动能的作用相反。磁能和内能通过动力学Alfven相互作用均分，而动能在解耦流体应变相互作用下演化。磁性能、动能能和内能的长波谱指数分别为−3/2、−3/2和−7/4，短波谱指数分别为−2、−5/3和−2。
Inertial range energy transfer, decorrelation, and energy spectra are studied analytically and numerically for strongly anisotropic magnetohydrodynamic (MHD) turbulence augmented by electron density evolution. The model is relevant to interstellar turbulence and magnetic turbulence in fusion devices. For long wavelengths (compared to the ion gyroradius), magnetic and kinetic energies are equipartitioned through interactions that decorrelate on the Alfvenic time scale. Internal energy transfer is governed by advection and decorrelates on the eddy turnover time scale. For short wavelengths, the roles of internal and kinetic energy reverse. Magnetic and internal energies are equipartitioned by the kinetic Alfven interaction, while kinetic energy evolves under a decoupled fluid straining interaction. The spectral indices for magnetic, kinetic, and internal energies are −3/2, −3/2, and −7/4 for long wavelengths, and −2, −5/3, and −2 for short wavelengths.