Magnetohydrodynamic and electromagnetic-particle simulations on the spontaneous fast magnetic reconnection model

自发快速磁重联模型的磁流体动力学和电磁粒子模拟

• 批准号: 11440146
• 负责人: UGAI Masayuki
• 金额: $ 9.09万
• 依托单位: Ehime University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11440146/
• 关键词: magnetic reconnection; magnetohydrodynamics; fluid and particle computer simulations; substorms; flares; space plasmas; anomalous resistivity; slow and fast shocks

We have proposed the spontaneous fast reconnection model, and its basic physical mechanism has been studied by precise computer simulations. It has been definitely demonstrated in a variety of physical situations that the fast reconnection mechanism involving standing slow shocks can drastically evolve because of the positive feedback between the (microscopic) anomalous resistivity in the reconnection region and the global reconnection flow, so that the spontaneous fast reconnection evolution is considered to be a nonlinear instability of the long current sheet system. It is shown that a large-scale magnetic loop formation with a fast shock standing just ahead of the loop top directly results from this theoretical model ; also, a large-scale plasmoid is formed and propagates outwards. Recently, the simulation models are extended to three dimensions, and the detailed 3D features of the spontaneous fast reconnection model have been clarified.

我们提出了自发快速重联模型，并通过精确的计算机模拟研究了其基本物理机制。在各种物理条件下，由于重联区（微观）异常电阻率与整体重联流之间的正反馈作用，包含慢激波的快速重联机制可以发生剧烈的演化，因此，自发的快速重联演化被认为是长电流片系统的非线性不稳定性。结果表明，一个大规模的快速冲击站在前面的环顶部的磁回路形成直接从这个理论模型的结果，也形成了一个大规模的等离子体团向外传播。最近，模拟模型被扩展到三维，自发快速重联模型的详细的3D功能已经澄清。

项目成果

M.Ugai: "Basic physical mechanism of reconnection development and magnetic loop dynamics"J. Geophys. Res. Vol.104, No.4. 6929-6939 (1999)

M.Ugai：“重联发展和磁环动力学的基本物理机制”J。

M.Ugai, K.Kondoh and T.Shimizu: "Computer simulations on three-dimensional magnetic loop dynamics by the spontaneous fast reconnection"Phys.Plasmas. (in press). (2003)

M.Ugai、K.Kondoh 和 T.Shimizu：“通过自发快速重联对三维磁环动力学进行计算机模拟”Phys.Plasmas。

M.Ugai: "Computer studies on the spontaneous fast reconnection model as a nonlinear instability"Phys.Plasma. Vol.6,No.5. 1522-1531 (1999)

M.Ugai：“作为非线性不稳定性的自发快速重联模型的计算机研究”Phys.Plasma。

M.Ugai, K.Kondoh: "Computer studies on the spontaneous fast reconnection evolution in various phsycal situations"Phys. Plasmas. Vol.8, No.5. 1545-1552 (2001)

M.Ugai，K.Kondoh：“各种物理情况下自发快速重连进化的计算机研究”Phys。

K.Kondoh, M.Ugai: "Computer simulations of flux transfer event : Effect of solar wind flow"Adv. Space Res.. Vol.29, No.7. 1119-1124 (2002)

K.Kondoh、M.Ugai：“通量传递事件的计算机模拟：太阳风流的影响”Adv。