| 2004年3月18日高纬磁层顶多重通量管事件分析 |
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| 引用本文： | 魏勇,肖池阶,濮祖荫,洪明华,万卫星,刘振兴.2004年3月18日高纬磁层顶多重通量管事件分析[J].地球物理学报,2006,49(4):929-935. |
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| 作者姓名： | 魏勇 肖池阶 濮祖荫 洪明华 万卫星 刘振兴 |
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| 作者单位： | 1.中国科学院地质与地球物理研究所，北京 100029 2 中国科学院武汉物理与数学研究所, 武汉 430071 3 中国科学院研究生院, 北京 100039 4 中国科学院国家天文台，北京 100012 5 北京大学地球与空间科学学院，北京 100871 6 中国科学院空间科学与应用研究中心, 北京 100080 |
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| 基金项目： | 国家自然科学基金（40374061）、青年基金（40504021）和国家自然科学重大基金（40390150）及中国科学院创新方向性项目（kzcx3-SW-144）资助. |
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| 摘 要： | 2004-03-18 23:10～23:50 UT期间，“双星（Double Star）”探测一号卫星（TC 1）在向阳面磁层顶高纬晨侧由内向外穿越磁层顶，其时TC_1的GSM坐标为 (75RE, -55RE, -54RE), RE为地球半径.穿越过程中TC_1观测到了8个通量管和1个磁通量传输事件（FTEs）.在此期间Cluster星簇位于向阳面太阳风内，其GSM坐标为(180RE, -31RE, -62RE)，其4颗卫星监测到行星际磁场（IMF）的BZ分量持续南向，BＹ有较大的负值.本文的研究表明：TC_1观测到的前7个通量管具有准周期重现性，周期大约是1～4 min，明显小于以前所观测到的FTEs的平均周期(8～11 min)；所有的通量管都具有较强的核心场.本文分别使用最小方差分析法（MVA）和Grad_Shafranov反演方法（GSR）对通量管的轴向进行了分析和对比，发现所有的通量管主轴基本沿晨昏向，结果显示GSR方法在轴向分析上比MVA优越.本文使用GSR方法对通量管的磁场结构进行了分析，恢复出了通量管的磁场在卫星穿越面的结构图；此外，本文还对这次多重通量管事件进行了deHoffmann Teller(HT)分析，结果表明，所有通量管大致朝南极方向运动，均来源于向日面低纬区域.这说明它们可能起源于向日面低纬区，由该区的磁场分量重联产生.
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| 关 键 词： | 磁重联 磁通量管 通量传输事件（FTEs） 最小方差分析法（MVA） Grad Shafranov反演方法（GSR） |
| 文章编号： | 0001-5733（2006）04-0929-07 |
| 收稿时间： | 2005-11-14 |
| 修稿时间： | 2005-11-142006-03-09 |
A further study of multiple flux rope events at the magnetopause observed by TC_1 on 18 March 2004 |
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| WEI Yong,XIAO Chi-Jie,PU Zu-Yin,HONG Ming-Hua,WAN Wei-Xing,LIU Zhen-Xing.A further study of multiple flux rope events at the magnetopause observed by TC_1 on 18 March 2004[J].Chinese Journal of Geophysics,2006,49(4):929-935. |
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| Authors: | WEI Yong XIAO Chi-Jie PU Zu-Yin HONG Ming-Hua WAN Wei-Xing LIU Zhen-Xing |
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| Institution: | 1.Instittae of Geology and Geophysics, Chinese Academy of Science, Beijing 100029, China;2.Wuhan Institute of Physics and Mathematics, Chinese Academy of Science, Wuhan 430071, China;3.Graduate School of the Chinese Academy of Science, Beifing 100039, China;4.National Astronomical Observatories, Chinese Academy of Sciences,Beijing 100012, China;5.School of Earth and Space Sciences, Peking University, Bering 100871, China;6.Center for Space Science and Application Research, Chinese Academy of Sciences, Beijing 100080, China |
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| Abstract: | From 23:10 to 23:50 UT on 18 March 2004, the Double Star TC_1 spacecraft detected nine flux ropes at the outbound crossing of the southern dawnside magnetopause. During this time period the Cluster constellation was staying in the magnetosheath. The four spacecraft observed that the interplanetary magnetic field (IMF) has a dominant negative BY component together with a southward BZ. Notable guide field was found to exist inside all eight magnetic flux ropes detected by TC_1 The precedent seven ropes observed from 23:14～23:27 UT that appeared quasi_periodically with a repeated period being approximately 1～4 minutes, which is much shorter than the averaged occurrence period (about 8～11 minutes) of the flux transfer events (FTEs) at the dayside magnetopause. The Minimum Variation Analysis (MVA) and the Grad_Shafronov Reconstruction (GSR) technique are applied in the present study of this multiple flux rope events. BY is large, all the principal axes of this flux ropes are found to be along the dawn_dusk direction. The deHoffmann_Teller (HT) analysis shows that the HT velocities (VHT) of these flux ropes were all directed dawnward and poleward, indicating that they came from the duskward and equatorward side of the spacecraft location and were produced via component magnetic reconnection in the subsolar region at the magnetopause. |
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| Keywords: | Magnetic reconnection Magnetic flux rope Flux transfer events(FTEs) Minimum Variation Analysis Grad-Shafronov Reconstruction |
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