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一次磁层亚暴期间磁场偶极化的尾向传播
Alternative TitleDipolarization observed by TC1 and ClusterII during substorm in Sep.14 , 2004
曹馨; 濮祖荫; 张辉; 傅绥燕; 马志伟; 肖池阶; 刘振兴; 谢伦; 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
2007
Volume50Issue:4Pages:995-1004
ISSN0001-5733
Language中文
Keyword偶极化 亚暴 近地重联 持续尾瓣重联 pi2
Abstract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.
Other AbstractWe 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.
Indexed ByCSCD
Funding Project中国科学院空间科学与应用研究中心
Citation statistics
Cited Times:2[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/1448
Collection空间科学部
Corresponding Author北京8701信箱
Recommended Citation
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.,...&北京8701信箱.(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.
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