Study of three dimensional reconnection processes

三维重联过程的研究

• 批准号: 05452081
• 负责人: TERASAWA Toshio
• 金额: $ 4.48万
• 依托单位: University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05452081/
• 关键词: Magnetic reconnection; Magnetohydrodynamics; Computational physics; Turbulence; Plasma instability

We have studied the tree dimensional structure of the magnetic neutral line, which is believed to be important in the magnetic reconnection process in space plasma environment. New findings/developments are1) New hybrid/two-fluid numerical scheme with high accuracy. Discovery of the excitation of turbulence due to the coupling between tearing mode and drift wave instabilities2) Observational evidence of the Alfvenic relation between the velocity perturbation and field perturbation, which has been theoretically predicated in our study in 1993.3) Construction of a new 2-fluid/hybrid scheme retaining the electron inertia effect, which is believed to be important for the microstructure of magnetic neutral lines. We have found the possibility that the electron tail current contribution can exceed the ion tail current.4) Observation of non-Harris type tail current structure5) Existence of a characteristic spatial/time scale in the magnetotail turbulence

我们研究了空间等离子体环境中磁中性线的三维结构，认为它在磁场重联过程中起着重要的作用。新的发现/进展是：1）新的高精度混合/双流体数值格式。发现了由于撕裂模和漂移波不稳定性之间的耦合引起的湍流激发2）观察到了速度扰动和场扰动之间的Alfvenic关系的证据，这是我们在1993年的研究中从理论上预言的。3）构造了一个新的保留电子惯性效应的2流体/混合方案，这被认为对于磁中性线的微结构是重要的。我们发现了电子尾电流贡献超过离子尾电流的可能性。4）非Harris型尾电流结构的观测。5）磁尾湍流中存在特征的空间/时间尺度

项目成果

M.Fujimoto: "Anomalous ion mixing within an MHD scale KH vortex" J.Geophys.Res.99. 8601-8613 (1994)

M.Fujimoto：“MHD 尺度 KH 涡旋内的异常离子混合”J.Geophys.Res.99。

M.Hoshino: "Turbulent magnetic field in the distant magnetotail : Bottom-up process of plasmoid formation?" Geophys.Res.Letts.21. 2935-2938 (1994)

M.Hoshino：“遥远磁尾中的湍流磁场：等离子体团形成的自下而上的过程？”

T.Terasawa: "A New Class of Exact Solutions for 3D Compressible Reconnection Problem" J.Geomag.Geoelectr.45. 613-618 (1993)

T.Terasawa：“3D 可压缩重连问题的新型精确解决方案”J.Geomag.Geolectr.45。

Terasawa,T: "Three dimensional structure of reconnection region" Adv.Space Res.(in press).

Terasawa,T：“重连区域的三维结构”Adv.Space Res.（正在出版）。

Terasawa,T.: "Ion acceleration" Adv.Space Res.(in press).

Terasawa,T.：“离子加速”Adv.Space Res.（正在印刷中）。