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arXiv 2104.12013physics.plasm-ph
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作为能量级联过程的磁重联

Magnetic reconnection as an energy cascade process

S. Adhikari, T. N. Parashar, M. A. Shay, W. H. Matthaeus, P. Sharma Pyakurel, S. Fordin, J. E. Stawarz, J. P. Eastwood

摘要:

重联和湍流是等离子体中最常见的两个动力学过程,但它们之间的关系仍然没有完全理解。使用2.5维动力学粒子在细胞模拟强湍流和重联,我们比较了跨尺度的能量转移在两个系统中通过分析的推广的冯卡门Howarth方程霍尔磁流体力学,制定,包括稳定级联率的三阶定律。尽管大尺度特征是完全不同的,但发现在两种情况下能量传递的分解在结构上非常相似。在重联的情况下,能量转移的时间演化也表现出与重联率的相关性。这些结果提供了明确的证据,重新连接本身基本上是一个能量级联过程。

英文摘要:

Reconnection and turbulence are two of the most commonly observed dynamical processes in plasmas, but their relationship is still not fully understood. Using 2.5D kinetic particle-in-cell simulations of both strong turbulence and reconnection, we compare the cross-scale transfer of energy in the two systems by analyzing the generalization of the von Kármán Howarth equations for Hall magnetohydrodynamics, a formulation that subsumes the third-order law for steady cascade rates. Even though the large scale features are quite different, the finding is that the decomposition of the energy transfer is structurally very similar in the two cases. In the reconnection case, the time evolution of the energy transfer also exhibits a correlation with the reconnection rate. These results provide explicit evidence that reconnection itself is fundamentally an energy cascade process.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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