Alfvén-Fast Wave Coupling in a 2D Nonuniform Medium
Alfvén-Fast Wave Coupling in a 2D Nonuniform Medium
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二维非均匀介质中的阿尔芬快波耦合
DOI：
10.1029/2023ea003167
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发表时间：
2023
影响因子：
3.1
通讯作者：
Davies R
中科院分区：
文献类型：
--
作者：
Davies R
提出了一种二维笛卡尔模拟，并用于求解理想的低β线性磁流体动力学方程。模拟研究了阿尔文波在阿尔文速度和密度不均匀性中的传播。特别是，通过耦合到快波的阿尔芬波能量的损失，以及阿尔芬波的形式，因为它出现在非均匀区域进行了研究。这一点的潜在应用包括木星和地球的磁层。结果表明，阿尔文波可以显着扭曲的不均匀性，仍然有效地通过该区域传播，与相对少量的阿尔文波能量损失通过模式转换和反射。
A 2D Cartesian simulation is presented and used to solve the ideal, low‐beta, linear magnetohydrodynamics equations. A simulation is used to investigate the propagation of Alfvén waves through inhomogeneities in Alfvén speed and density. In particular, the loss of Alfvén wave energy through coupling to the fast wave, and also the form of the Alfvén wave as it emerges from the inhomogeneous region is studied. Potential applications of this include the magnetospheres of both Jupiter and the Earth. The results show that Alfvén waves can be significantly distorted by a nonuniformity and still propagate through the region efficiently, with relatively small amounts of Alfvén wave energy lost through mode conversion and reflection.