高纬向阳侧磁层顶通量传输事件的特性研究--通量管轴线方位及运动分析
文献类型：期刊论文
| 作者 | 姚丽 ; 刘绍亮 ; 金曙平 ; 刘振兴 ; 史建魁A ; Balogh ; H ; Reme ; P W ; Daly |
| 刊名 | 地球物理学报
 |
| 出版日期 | 2005 |
| 卷号 | 48期号:6页码:1217-1225 |
| 关键词 | 通量传输事件 Cluster Ⅱ观测 磁场重联 最小方差法 HT分析 |
| ISSN号 | 0001-5733 |
| 其他题名 | A study of orientation and motion of flux transfer events observed at the high-latitude dayside magnetopause |
| 通讯作者 | 北京8701信箱 |
| 中文摘要 | 本文分析了2001年2月和3月期间ClusterⅡ穿越磁层顶前后的观测资料,检测到13个通量传输事件(FTEs).用多颗卫星磁场测量资料的最小方差分析(MVAB)方法确定FIE的管轴方向(其中6个方向较可靠).FTE管轴方向的分布和低纬处不同,在磁顶法线坐标系LMN中对M轴有较大偏离,比较靠近L轴．deHoffmann.Teller(HT)分析指出,13个FTEs都存在一个很好的FIT参考系,表明它们以一个准稳的MHD结构运动.对垂直于管轴方向的运动分析表明FTEs并不一定和背景等离子体一起对流,它们可快于或慢于背景流,但FTEs的运动和背景流基本沿相同方向,其间可有一不大的夹角.在HT坐标系中,10个FTEs的等离子体速度接近零,其他3个FTEs的等离子体速度约为局地Alfven波速的14％,都不符合Walen关系.其中北半球事件的Walen曲线为正斜率,南半球事件为负斜率,这说明等离子体沿磁力线(北半球顺着磁场,南半球逆着磁场)流向磁层. |
| 英文摘要 | We investigate 13 FTEs,which were detected by the Cluster IIin the magnetosheath near the cusp region during February to March 2001 The orientation of the FTE tube axis is derived by virtue of minimum variance analysis (MVA) using magnetic field data from the four Cluster spacecraft.Of 13 events,6 axis directions are determined reliably,most of them are closer to the L axis than to the M axis in the boundary normal coordinate system LMN. This implies that there are some differences between them and those events observed at the low-latitude magnetopause,whose axes tend to lie in east-west directions. The deHoffmann-Teller (HT) frame for 13 events are also obtained,and there are good HTframes for all FTEs.The correlation coefficients between the convection electric field and the HT electric field are larger than 0196 except two of them are about 0191 This means that the event passes the spacecraft as a moving quasi-static structure at VHT(velocity of the HTframe).The FTE moving in the direction perpendicular to its axis is not convected with the ambient magnetosheath plasma,and the velocity of FTE tube may be slower or faster than the ambient plasma.The motion direction of FTE tube is about the same as the ambient plasma,but there may be a small angle between them. The plasma velocity in the HTframe approximates to zero for ten FTEs,and is only about 14 % of the local Alfven speed for the others , which are all not satisfied with the Walen relation. The slope of the Walen plot is positive in the northern hemisphere and negative in the southern hemisphere.This implies that the plasma flows along the magnetic field into the magnetosphere (parallel magnetic field in the northern hemisphere and anti-parallel magnetic field in the southern hemisphere) . |
| 学科主题 | 空间物理 |
| 收录类别 | CSCD |
| 资助信息 | 国家自然科学基金项目和国家基金委重大项目资助,部分受中国科学技术大学创新工程项目的资助. |
| 语种 | 中文 |
| CSCD记录号 | CSCD:2161007 |
| 源URL | [http://ir.cssar.ac.cn/handle/122/1368]  |
| 专题 | 国家空间科学中心_空间科学部 |
| 推荐引用方式 GB/T 7714 | 姚丽,刘绍亮,金曙平,等. 高纬向阳侧磁层顶通量传输事件的特性研究--通量管轴线方位及运动分析[J]. 地球物理学报,2005,48(6):1217-1225. |
| APA | 姚丽.,刘绍亮.,金曙平.,刘振兴.,史建魁A.,...&Daly.(2005).高纬向阳侧磁层顶通量传输事件的特性研究--通量管轴线方位及运动分析.地球物理学报,48(6),1217-1225. |
| MLA | 姚丽,et al."高纬向阳侧磁层顶通量传输事件的特性研究--通量管轴线方位及运动分析".地球物理学报 48.6(2005):1217-1225. |
入库方式： OAI收割
来源：国家空间科学中心
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