剪切Alfven波包的混合
Mixing of shear Alfven wave packets
摘要：
剪切阿尔芬波包在非均匀磁场中的传播，在其变形的起源，无论非线性耦合的发生，被认为是。结果表明，扭曲机制可以被视为混合过程，因此，标准的“相混合”对应的“Alfvenic”剪切流的效果，而在磁X点增强耗散对应于混合的“Alfvenic”应变流。全球波场的演化被认为是由波包叠加的动力学过程引起的，并根据程函（WKB）描述得到了波能的动力学方程。由于剪切阿尔芬波包在由非均匀阿尔芬流$\mathbf{V}_{A}$传输时经历连续的剪切/应变，因此它们在物理空间中的混合过程也是k空间中波能的级联。从这种线性机制的能量转移所产生的波的能量谱确定的特殊情况下，波沿混沌磁场线传播，模拟的混沌混合过程。后者在$k$空间的能量守恒范围内遵循$k^{-1}$幂律。
英文摘要：
The propagation of shear Alfven wave packets in inhomogeneous magnetic fields, at the origin of their distortion, regardless of the occurrence of non-linear coupling, is considered. It is shown that the distortion mechanism can be regarded as mixing process and hence, standard "phase mixing" corresponds to the effect of an "Alfvenic" shear flow while enhanced dissipation at a magnetic X-point corresponds to mixing by an "Alfvenic" strain flow. The evolution of the global wave field is supposed to result from the dynamics of a superposition of wave packets and a kinetic equation for the wave energy is obtained following this eikonal (WKB) description. Since shear Alfven wave packets experience continuous shearing/straining while transported by an inhomogeneous Alfvenic flow $\mathbf{V}_{A}$, their mixing process, in physical space, is also a cascade of wave energy in k-space. The wave energy spectrum resulting from this linear mechanism of energy transfer is determined for the special case of waves propagating along chaotic magnetic field lines, the analog of a chaotic mixing process. The latter follows a $k^{-1}$ power-law, in the energy conserving range in $k$ space.
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