一次磁层亚暴期间磁场偶极化的尾向传播
文献类型：期刊论文
| 作者 | 曹馨 ; 濮祖荫 ; 张辉 ; 傅绥燕 ; 马志伟 ; 肖池阶 ; 刘振兴 ; 谢伦 |
| 刊名 | 地球物理学报
 |
| 出版日期 | 2007 |
| 卷号 | 50期号:4页码:995-1004 |
| ISSN号 | 0001-5733 |
| 关键词 | 偶极化 亚暴 近地重联 持续尾瓣重联 Pi2 |
| 其他题名 | Dipolarization observed by TC1 and ClusterII during substorm in Sep.14 , 2004 |
| 通讯作者 | 北京8701信箱 |
| 中文摘要 | 利用TC1,Cluster和Polar结合极光和同步高度及地磁的观测,研究了2004年9月14日1730-1930UT时间段的亚暴偶极化过程.此前行星际磁场持续南向几个小时.亚暴初发(Onset)开始于1823UT.2min之后,同步高度的LANL-02A在子夜附近观测到了明显的能量电子增强(Injection)事件,而TC1在1827UT左右在磁尾(-10,-2,0)RE(GSE)观测到了磁场日.的突然下降,伴随着等离子体压强和温度的突然增加及磁场的强烈扰动.在(-16,1,3)R.(GSE)的Cluster上相同的仪器观测列相同的现象,只是比TC1观测到的晚大约23min,在1850UT左右.虽然Polar在更靠近地球的较高纬度(-7.5,3.5,-4.0)R.(GSE)附近,也在1855UT左右观测到了这种磁场偶极化现象.以上的观测时序表明TC1,Cluster观测到的磁场偶极化比亚暴偶极化初始发生分别晚4min和27min,说明偶极化由近磁尾向中磁尾传播.详细计算表明偶极化源区的位置大约在x=-7.7RE--8.6RE,而传播速度大约为70km·s^-1.在这个事件中亚暴的物理图像可能是中磁尾的近地重联产生的地向高速流到达近磁尾,为近磁尾的亚暴触发创造了条件;亚暴在近磁尾触发之后,磁场偶极化峰面向中磁尾传播. |
| 英文摘要 | We study the substorm dipolarization occurring from 1730 to 1930 UT on Sep.14,2004 based on DSPPTC1,Cluster and Polar data , combined with the aurora and geosynchronous energetic particle measurements and ground2based magnetic field observations. During this time period the IMF was continuously southward. Substorm onset started at about 1823 UT. Two minute later,energetic electron injection was observed by LANL202A in the pre2midnight sector at geostationary orbit.At-1827 UT TC1,which was located at ( - 10,- 2,0) RE ( GSE) in the near-Earth tail,saw a sharp decrease of magnetic BX component,accompanied by sudden increases in both the ion temperature and thermal pressure.About 23 minutes later at -1850 UT,the same signatures as observed by TC1 were observed by Cluster at ( - 16,1,3) RE (GSE) in the mid2tail.Meanwhile,Polar,which was located much higher and more close to the Earth at (-715,315,- 410 ) RE ( GSE),saw a sudden change in the elevation of the magnetic field at about 1855 UT.Aforementioned time sequence of substorm activities indicates that the expansion onset took place at about 1823 UT and TC1 and Cluster observed dipolarization (tail expansion) 4 and 27 minutes later,respectively. This means that tail expansion was propagated from source region in the near2Earth tail to the mid2tail.Detailed calculations imply that the source of the dipolarization was situated at X = - 717 RE to - 816 RE and the propagation speed was about 70 km/s - 11 A substorm paradigm is proposed to explain the observations in this substorm event: Earthward flow produced by lobe reconnection in the mid-tail creates favorable conditions for substorm initiation in the near2Earth ; after the expansion onset the dipolarization front propagates down to the tail. |
| 学科主题 | 空间物理 |
| 资助信息 | 国家基金委重大课题"地球空间暴多时空尺度物理过程研究"和重点课题"磁层亚暴触发过程的全球MHD2Hall 数值模 拟"支持,属于北京市重点学科支持项目. |
| 收录类别 | CSCD |
| 语种 | 中文 |
| CSCD记录号 | CSCD:2839728 |
| 源URL | [http://ir.cssar.ac.cn/handle/122/1448]  |
| 专题 | 国家空间科学中心_空间科学部 |
| 推荐引用方式 GB/T 7714 | 曹馨,濮祖荫,张辉,等. 一次磁层亚暴期间磁场偶极化的尾向传播[J]. 地球物理学报,2007,50(4):995-1004. |
| APA | 曹馨.,濮祖荫.,张辉.,傅绥燕.,马志伟.,...&谢伦.(2007).一次磁层亚暴期间磁场偶极化的尾向传播.地球物理学报,50(4),995-1004. |
| MLA | 曹馨,et al."一次磁层亚暴期间磁场偶极化的尾向传播".地球物理学报 50.4(2007):995-1004. |
入库方式： OAI收割
来源：国家空间科学中心
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。