| 非稳态多重X线重联的类型与特征 |
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| 引用本文： | 金曙平,宋锦文.非稳态多重X线重联的类型与特征[J].地球物理学报,1996,39(6):739-746. |
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| 作者姓名： | 金曙平 宋锦文 |
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| 作者单位： | 1. 中国科学技术大学，合肥 230026;
2. 第三世界科学院地球科学与天文学高级研究中心，合肥 230026 |
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| 摘 要： | 为了进一步认识间歇性多重Ｘ线重联的特征，本文分析计算结果，发现入流自边界进入后向两侧发散，沿着ｘ轴（ｚ＝０）和出流边界（ｚ＝２），压强Ｐ和磁场Ｂ的分布形态表明这种非稳态重联属快模式扩张型．数值结果还表明，进入扩散区的入流马赫数Ｍｉ与磁雷诺数Ｒｍ之间基本满足关系式Ｍｉ≈１．５Ｒｍ－１／２─１．７５Ｒｍ－１／２，而且等离子体的加速与压强Ｐｔ(Ｐｔ
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| 关 键 词： | 非稳态多重x线重联 快模式扩张 重联率 切向速度 |
| 收稿时间： | 1995-07-16 |
THE CHARACTERISTICS AND TYPE OF THE UNSTEADY STATE MAGNETIC RECONNECTION |
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| JIN SHU-PING, SONG JIN-WEN.THE CHARACTERISTICS AND TYPE OF THE UNSTEADY STATE MAGNETIC RECONNECTION[J].Chinese Journal of Geophysics,1996,39(6):739-746. |
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| Authors: | JIN SHU-PING SONG JIN-WEN |
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| Institution: | 1. Departmenr of Earth and Space Science, University of Science and Technology of China, Hefei 230026, China;
2. Advanced Ccntre for Eorsh Science and Astronomy, University of Science and Technology of China, Third World Academy of Science, Hefei 230026, China |
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| Abstract: | The intermittent multiple X-line reconnection is numerically analyzed in this paper. A fast-mode expansion is expected in the light of the divergent plasma flow and the features of the profiles for magnetic field strength B and pressure P along the lines z=0 and z=2. It can be seen from numerical results that the inflow Mach Number Mi reached at the diffusion region scales with magnetic Reynolds number Rm as Rm-1/2 and the plasma is accelerated by the pressure gradient force. These characteristics are close to the features of Sweet-Parker reconnection with a long current sheet. The tangential velocity component Vz at the inflow boundary (x=1).is defined as V 0. The comparison of numerical results shows that a low uniform resistivity (corresponding to high Magnetic Reynolds nuinber) play a key role in the formation of the unsteady multiple X-line reconnection, but the different setting of tangential velocity Vz at x =1 is not so important. |
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| Keywords: | Unsteady state magnetic reconnection Fast-mode expansion Reconnection rate Tangential velocity |
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