Dynamics of structure formation and self-organization in open systems
开放系统中结构形成和自组织的动力学
基本信息
- 批准号:13640414
- 负责人:
- 金额:$ 1.6万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (C)
- 财政年份:2001
- 资助国家:日本
- 起止时间:2001 至 2003
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
A. There are a steady regime and an intermittent regime in the temporal behavior of collisionless reconnection, dependently on the spatial profile of an external driving flow. The steady collisionless reconnection is realized in the case of small input window size, in which the reconnection rate is balanced with the flux input rate at the upstream boundary and the global dynamic process of magnetic reconnection is dominantly controlled by ion dynamics : As the window size increases, the current sheet becomes longer, which is favorable to the excitation of an electron tearing instability. The system evolves into an intermittent regime, in which magnetic islands are frequently generated in the current sheet. Two-scale structure is formed in the current density profile through combined actions of both ion and electron dynamics. Electron pressure tensor associated with electron meandering motion in the central electron current sheet is a main cause of generation of reconnection electric fi … More eld at neutral sheet in two-dimensional steady reconnection, although the evolution of the whole reconnection system is controlled mainly by an external condition.B. In three-dimensional case plasma instabilities are excited and affect the dynamical behavior of collisionless reconnection. In the presence of an external driving source the lower hybrid drift waves excited in the periphery propagate toward the neutral sheet and thus generate anomalous resistivity in the current sheet. Consequently, the external driving electric field penetrates into the current sheet and triggers magnetic reconnection at the neutral sheet. Magnetic islands are created in the downstream as a result of magnetic reconnection, but they become unstable against the kink instability. After magnetic islands disappear through the downstream boundary, the system relaxes into a quasi-steady state temporarily. An electromagnetic (EM) mode with a low-frequency comparable to ion gyration frequency (drift-kink instability) grows slowly in the current sheet and modifies the spatial structure.C. Self-generation process of hollow current profile and its influence on tilting instability in field-reversed configurations are investigated by means of two-dimensional and three-dimensional EM particle simulations. The system spontaneously relaxes from a magnetohydrodynamic equilibrium toward a kinetic one, in which the electron current profile becomes hollow. Growth rate of the tilting instability in the case of the hollow current profile and high separatrix beta value is smaller than that in the case of the peaked current profile. When magnetic separatrix shape is much prolate, the unstable region is localized near the edges, and stabilization of the tilt instability becomes effective. Less
A.无碰撞重联的时间行为有一个稳定的区域和一个间歇的区域,依赖于外部驱动流的空间轮廓。在小输入窗口条件下实现了稳定的无碰撞重联,重联速率与上游边界处的通量输入速率相平衡,重联的全局动力学过程主要受离子动力学控制:随着窗口尺寸的增大,电流片变长,有利于激发电子撕裂不稳定性.该系统演变成一个间歇性的制度,其中磁岛经常产生的电流片。在离子动力学和电子动力学的共同作用下,电流密度分布呈现双尺度结构。电子在中心电流片中的弯曲运动所产生的电子压力张量是产生重联电场的主要原因 ...更多信息 虽然整个重联系统的演化主要受一个外部条件的控制,但在二维定常重联中,中性片处的重联系统的演化仍然是一个稳定的过程。在三维情况下,等离子体的不稳定性被激发,并影响无碰撞重联的动力学行为。在外部驱动源的存在下,在外围激发的低杂波漂移波向中性片传播,从而在电流片中产生异常电阻率。因此,外部驱动电场穿透电流片并触发中性片处的磁重联。磁场重联的结果是在下游产生磁岛,但它们对扭结不稳定性变得不稳定。当磁岛通过下游边界消失后,系统暂时进入准稳态。具有与离子回旋频率相当的低频的电磁(EM)模式(漂移-扭结不稳定性)在电流片中缓慢生长并修改空间结构。利用二维和三维电磁粒子模拟方法研究了场反转位形中空心电流分布的自产生过程及其对倾斜不稳定性的影响。系统自发地从磁流体动力学平衡向动力学平衡弛豫,其中电子电流分布变得中空。在空心电流剖面和高分界线β值的情况下,倾斜不稳定性的增长率小于在尖峰电流剖面的情况下。当磁分界线形状较长时,不稳定区域局限于边缘附近,倾斜不稳定性的稳定化变得有效。少
项目成果
期刊论文数量(45)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
R.Horiuchi, H.Ohtani, A.Ishizawa: "Structure formation and dynamical behavior of kinetic plasmas controlled by magnetic reconnection"Computer Physics Communications. (掲載決定). (2004)
R.Horiuchi、H.Ohtani、A.Ishizawa:“磁重联控制的动态等离子体的结构形成和动力学行为”计算机物理通讯(2004 年出版)。
- DOI:
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- 期刊:
- 影响因子:0
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- 通讯作者:
T.Hayashi, R.Horiuchi, K.Watanabe, T.Sato: "Outlook of Multiple Time and Spatial Scale Simulation for Understanding Self Organizing Phenomena in Plasmas."J.Plasma and Fusion Research. 79. 464-469 (2003)
T.Hayashi、R.Horiuchi、K.Watanabe、T.Sato:“用于理解等离子体中自组织现象的多时间和空间尺度模拟的展望。”J.等离子体与聚变研究。
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- 影响因子:0
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- 通讯作者:
H.Naito, T.Matsumoto, Y.Todo, R.Horiuchi: "Kinetic Effects on Magnetohydrodynamic Phenomena"J. of Plasma and Fusion Research. Vol.77. 547-556 (2001)
H.Naito、T.Matsumoto、Y.Todo、R.Horiuchi:“磁流体动力学现象的动力学效应”J。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
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- 通讯作者:
T.Ishimori, T.Kaneko, S.Ishiguro, R.Hatakeyama, N.Sato: "Particle Simulation of Potential Formation Due to Local ECR along Diverging Magnetic-Field Lines"Journal of Plasma and Fusion Research. Vol.IV(掲載予定). (2002)
T.Ishimori、T.Kaneko、S.Ishiguro、R.Hatakeyama、N.Sato:“沿发散磁场线局部 ECR 的潜在形成的粒子模拟”等离子体与聚变研究杂志第 IV 卷(待定)。出版))(2002)。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
H.Naito, T.Matsumoto, Y.Todo, R.Horiuchi: "Kinetic Effects on Magnetohydrodynamic Phenomena"J.Plasma and Fusion Research. 77. 547-556 (2001)
H.Naito、T.Matsumoto、Y.Todo、R.Horiuchi:“磁流体动力学现象的动力学效应”J.等离子体与聚变研究。
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- 影响因子:0
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HORIUCHI Ritoku其他文献
小川泰信, 宮岡宏, 野澤悟徳, 大山伸一郎, 津田卓雄, 中村卓司, 藤井良一, EISCATサイエンスチーム
Yasunobu Okawa、Hiroshi Miyaoka、Gotoku Nozawa、Shinichiro Oyama、Takuo Tsuda、Takuji Nakamura、Ryoichi Fujii、EISCAT 科学团队
- DOI:
- 发表时间:
2015 - 期刊:
- 影响因子:0
- 作者:
NISHIDA Kento;HORIUCHI Ritoku;ONO Yasushi;EISCAT及びEISCAT_3Dレーダーを用いた北極域超高層大気の国際共同研究 - 通讯作者:
EISCAT及びEISCAT_3Dレーダーを用いた北極域超高層大気の国際共同研究
Analysis of Energy Conversion during Co- and Counter-Helicity Spheromak Merging by Particle-In-Cell Simulation
通过粒子内模拟分析同螺旋和反螺旋 Spheromak 合并过程中的能量转换
- DOI:
10.1585/pfr.14.3401145 - 发表时间:
2019 - 期刊:
- 影响因子:0.8
- 作者:
NISHIDA Kento;HORIUCHI Ritoku;ONO Yasushi - 通讯作者:
ONO Yasushi
HORIUCHI Ritoku的其他文献
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{{ truncateString('HORIUCHI Ritoku', 18)}}的其他基金
Multi-hierarchy simulation studies of magnetic reconnection phenomena
磁重联现象的多层次模拟研究
- 批准号:
18340188 - 财政年份:2006
- 资助金额:
$ 1.6万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Triggering mechanism of magnetic reconnection in a collisionless plasma
无碰撞等离子体中磁重联的触发机制
- 批准号:
10680468 - 财政年份:1998
- 资助金额:
$ 1.6万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
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Priority Programmes