Gyrofluid description of Alfvenic turbulence and its parallel electric field
Gyrofluid description of Alfvenic turbulence and its parallel electric field
复制标题
阿尔芬湍流及其平行电场的陀螺流体描述
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
E. P. Kontar
中科院分区：
文献类型：
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作者：
N. Bian;E. P. Kontar
在强背景磁场中，具有k_{parallel}/k_{perp} 11的各向异性Alfv 'nic涨落保持在远小于离子回旋频率的频率上.基于均匀等离子体中电磁回旋流体方程的最简截断，建立了一个由Alfv 'e}nic湍流产生的能量级联模型，该模型平滑地连接了磁流体力学（MHD）大尺度和“动力学”小尺度.得到了电磁涨落的标度关系，它是k_{perp}$和k_{parallel}$的函数。此外，还特别讨论了由Alfv '{e}nic湍流产生的平行电场的谱结构。原因是这种平行电场在湍流加速和粒子传输中的潜在含义。对于电磁湍流，这个问题在[A.长谷川湾米马，J.地球物理学。Res. {1117（1978）]。
Anisotropic Alfv'{e}nic fluctuations with $k_{parallel}/k_{perp}ll 1$ remain at frequencies much smaller than the ion cyclotron frequency in the presence of a strong background magnetic field. Based on the simplest truncation of the electromagnetic gyrofluid equations in a homogeneous plasma, a model for the energy cascade produced by Alfv'{e}nic turbulence is constructed, which smoothly connect the large magnetohydrodynamics (MHD) scales and the small "kinetic" scales. Scaling relations are obtained for the electromagnetic fluctuations, as a function of $k_{perp}$ and $k_{parallel}$. Moreover, a particular attention is paid to the spectral structure of the parallel electric field which is produced by Alfv'{e}nic turbulence. The reason is the potential implication of this parallel electric field in turbulent acceleration and transport of particles. For electromagnetic turbulence, this issue was raised some time ago in [A. Hasegawa, K. Mima, J. Geophys. Res. {f 83} 1117 (1978)].
强磁场中的可压缩霍尔磁流体动力学
影响因子：
2.2
作者：
Bian N
通讯作者：
Bian N