Arid
DOI10.5194/angeo-22-2907-2004
GEOTAIL observation of tilted X-line formation during flux transfer events (FTEs) in the dayside magnetospheric boundary layers
Nowada, M; Sakurai, T; Mukai, T
通讯作者Nowada, M
来源期刊ANNALES GEOPHYSICAE
ISSN0992-7689
出版年2004
卷号22期号:8页码:2907-2916
英文摘要

The magnetic field and plasma structures during two successive crossings of the subsolar magnetospheric boundary layers (i.e. MagnetoPause Current Layer (MPCL) and Low-Latitude Boundary Layer (LLBL)) under the southward-dawnward IMF are examined on the basis of the data obtained by the GEOTAIL spacecraft. A significant and interesting feature is found, that is, Flux Transfer Events (FTEs) occur in association with the formation of the tilted X-line. During the first inbound MPCL/LLBL crossing, the ion velocity enhancement (in particular, the V-I component negatively increases) can be observed in association with simultaneous typical bipolar signature (positive followed by negative) in the B-n component. In addition, a clear D-shaped ion distribution whose origin is the magnetosheath can also be found in the dawnward direction. A few minutes later, the satellite experiences outbound MPCL crossing. The negative enhancement of the V-m component can be found as well as the positive enhancement of the V-I component. Simultaneously, a typical bipolar signature with the polarity (negative followed by positive) opposite that observed in the first encounter can also be observed. The ions from the magnetosheath flow predominantly in the duskward direction, although the D-shaped ion distribution cannot be observed. These results indicate that the satellite initially observes one part of a reconnected flux tube formed by FTEs whose magnetospheric side is anchored to the Southern Hemisphere. The ions confined in this partial flux tube are flowing in the south-dawnward direction. Then, the satellite observes the other part of the reconnected flux tube whose magnetospheric side is anchored to the Northern Hemisphere. The ions confined in this flux tube flow dominantly in the north-duskward direction. Furthermore, it can be considered that the second MPCL crossing is a direct cut through the diffusion region of FTEs because the LLBL is absent in the vicinity of the MPCL. On the basis of these results, it can be concluded that the satellite was passing near the tilted X-line. The information obtained through this study is expected to be of great use in discriminating between the anti-parallel (steady-state) reconnection and tilted X-line models on the dayside MPCL.


英文关键词magnetospheric physics magnetopause, cusp, arid boundary layers magnetosheath solar wind-magnetosphere interactions
类型Article
语种英语
国家Japan
收录类别SCI-E
WOS记录号WOS:000224483900022
WOS关键词MAGNETOPAUSE ; RECONNECTION ; ION
WOS类目Astronomy & Astrophysics ; Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences
WOS研究方向Astronomy & Astrophysics ; Geology ; Meteorology & Atmospheric Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/146160
作者单位(1)Japan Aerospace Explorat Agcy, Inst Space & Astronaut Sci, Sagamihara, Kanagawa, Japan;(2)Tokai Univ, Dept Aeronaut & Astronaut, Hiratsuka, Kanagawa 25912, Japan
推荐引用方式
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Nowada, M,Sakurai, T,Mukai, T. GEOTAIL observation of tilted X-line formation during flux transfer events (FTEs) in the dayside magnetospheric boundary layers[J],2004,22(8):2907-2916.
APA Nowada, M,Sakurai, T,&Mukai, T.(2004).GEOTAIL observation of tilted X-line formation during flux transfer events (FTEs) in the dayside magnetospheric boundary layers.ANNALES GEOPHYSICAE,22(8),2907-2916.
MLA Nowada, M,et al."GEOTAIL observation of tilted X-line formation during flux transfer events (FTEs) in the dayside magnetospheric boundary layers".ANNALES GEOPHYSICAE 22.8(2004):2907-2916.
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