| 亚暴膨胀相近磁尾位形不稳定性模型：I[1].近磁尾位形不稳定性 | |
| Alternative Title | A SUBSTORM EXPANSION MODEL BASED ON CONFIGURATION INSTABILITY OF THE NEAR-EARTHMAGNETOTAIL:I.CONFIGURATION INSTABILITY IN THE NEAR-EARTH MAGNETOTAIL |
| 濮祖荫; 洪明华; 王宪民; 陈祖幸; 傅绥燕; 宗秋刚; 王敬芳; 刘振兴; 北京8701信箱 | |
| Department | 空间天气学国家重点实验室 |
| Source Publication | 地球物理学报
 |
| 1996 | |
| Volume | 39Issue:4Pages:441-451 |
| ISSN | 0001-5733 |
| Language | 中文 |
| Keyword | 磁层亚暴 亚暴膨胀相 近磁尾漂移不稳定性 越尾电流中断 |
| Abstract | 用单流体和双流体ＭＨＤ近似，研究了近磁尾位形不稳定性（ＮＥＴＣ）．分析表明，ＮＥＴＣ可能存在两种漂移不稳定情况Ｃ１和Ｃ２与卫星观测资料对比显示，Ｃ２较容易在亚暴膨胀相前夕出现，它可以解释亚暴膨胀相期间磁场和等离子体扰动的特征周期、尾向传播速度、磁场扰动和等离子体压强扰动之间的位相关系，场向电流的周期性结构，西向涌浪头部的电子沉降和极光隆起等观测特性和现象．薄电流片的极端情况（Ｒｃ≈ｒｉ）不在本文的讨论范围之内 |
| Other Abstract | One-fluid and two-fluid MHD approaches are used to investigate configuration instability prior to onset of the substorm expansion phase in the near-Earth magnetotail. Completely identical results are obtained with these two methods. It is found that there are two instability criterions in the near-Earth tail: C1 and C2. In the limited case of,C1 and C2 are fulfiled, respectively, when β>2β1-2/r and β<2β1-2/γ,β1>1/γ,whereβrepresnets the ratio of the plasma pressure over the magnetic pressure,γ is the isentropic index, β_1=2L_ρ/R_o，L_ρ and R_o denote the scale length of the pressure gradient and the curvature dies of the magnetic field lines, respectively. Couzparison of our theory with GEOS 2 observations indicates that C2 may easily be satisfied in the Iate growth phase,leading to disruption of the cross-tail current and the formation of the substorm current wedge. It is also shown that the development of near- Earth cenfiguration instability can explain a number of characteristic features of the substorm expansion. |
| Funding Project | 中国科学院空间科学与应用研究中心 |
| Document Type | 期刊论文 |
| Identifier | http://ir.nssc.ac.cn/handle/122/1263 |
| Collection | 空间科学部 |
| Corresponding Author | 北京8701信箱 |
| Recommended Citation GB/T 7714 | 濮祖荫,洪明华,王宪民,等. 亚暴膨胀相近磁尾位形不稳定性模型：I[1].近磁尾位形不稳定性[J]. 地球物理学报,1996,39(4):441-451. |
| APA | 濮祖荫.,洪明华.,王宪民.,陈祖幸.,傅绥燕.,...&北京8701信箱.(1996).亚暴膨胀相近磁尾位形不稳定性模型：I[1].近磁尾位形不稳定性.地球物理学报,39(4),441-451. |
| MLA | 濮祖荫,et al."亚暴膨胀相近磁尾位形不稳定性模型：I[1].近磁尾位形不稳定性".地球物理学报 39.4(1996):441-451. |
| Files in This Item: | Download All | |||||
| File Name/Size | DocType | Version | Access | License | ||
| 1996394411.pdf（329KB） | 开放获取 | CC BY-NC-SA | View Download | |||
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment