Study on the Solar Wind-Magnetosphere Interaction Based on Remote Sensing Data From IMAGE Spacecraft

基于IMAGE航天器遥感数据的太阳风-磁层相互作用研究

基本信息

批准号：
15540427
负责人：
TAGUCHI Satoshi
金额：
$ 1.6万
依托单位：
The University of Electro-Communications
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

Observations by the Low Energy Neutral Atom (LENA) imager on the IMAGE spacecraft show that emission in the direction of the high-latitude magnetosheath is modulated in such a manner that the source shifts equatorward/poleward in the high-latitude sheath. A model based on the distributions of the sheath flux and of the number density of the hydrogen exosphere has explained these characteristics as a result of the motion of the magnetopause having an indentation at the cusp, suggesting a means for monitoring the cusp motion using IMAGE/LENA. Simultaneous observations from IMAGE/LENA and SuperDARN radar have given evidence for the means. Detailed analyses of an event of simultaneous observations from IMAGE and Polar have revealed that the high-latitude sheath emission consists of two parts : the stable emission at the higher-latitudes, and the lower-latitude emission that occurs on and off, and that that the entry of the cusp ions happens in concurrence with the appearance of the lower-latitude LENA emission. This strongly suggests that LENA monitors the entry of the ions in the cusp as well as the cusp indentation, and that the significant flux of the cusp ion entry occurs equatorward of, and separately from the cusp indentation. LENA also sometimes observes an enhanced emission in the direction of the very high-latitude magnetopause. Simultaneous observations from IMAGE/LENA and SuperDARN radar have shown that the LENA emission appears concurrently with the enhancement of the sunward flow of the reverse convection in the ionosphere. This shows that LENA can monitor the ion entry caused by cusp reconnection, and that the reconnection site moves on a time scale of several minutes. The reconnection "spot" mapped on a sphere having a radius of 8 Re shifts by approximately 1 Re over 10 minutes while fluctuating.

图像航天器上低能量中性原子（LENA）成像仪的观察表明，高纬度磁轴的发射以使源在高纬度鞘中移动赤道/极点的方式调节。基于护套通量的分布和氢气层的数量密度的模型，由于磁膜的运动在尖口处具有凹痕，这解释了这些特征，这表明一种使用图像/LENA监测尖端运动的手段。来自图像/Lena和Superdarn Radar的同时观察为这种手段提供了证据。对图像和极性同时观察事件的事件的详细分析表明，高纬度护套发射由两个部分组成：较高纬度时的稳定发射以及发生的较低纬度发射，而尖端离子的进入与较低的较低层的外观相一致。这强烈表明，莉娜（Lena）监测离子在尖端和尖凹处的进入，并且牙孔离子进入的显着通量发生在赤道，并与尖缘凹痕分开。莉娜有时还会观察到非常高纬度磁路方向上的发射增强。来自图像/Lena和Superdarn雷达的同时观察表明，Lena发射与电离层反向对流的太阳流的增强同时出现。这表明Lena可以监视尖峰重新连接引起的离子进入，并且重新连接站点的时间尺度为几分钟。在波动时，重新连接的“斑点”映射在一个半径为8 re的球体上，大约在10分钟的时间内。

项目成果

期刊论文数量（18）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Overwhelming O^+ contribution to the plasma sheet energy density during the October 2003 superstorm : Geotail/EPIC and IMAGE/LENA observations

2003 年 10 月超级风暴期间 O^ 对等离子体片能量密度的压倒性贡献：Geotail/EPIC 和 IMAGE/LENA 观测

DOI：
发表时间：
2005
期刊：
Journal of Geophysical Research 110・A9
影响因子：
0
作者：
Urabe;A.;Tateishi;M.;Inouchi;Y.;Matsuoka;H.;Inoue;T.;Dmytriev;A.;Khlystov;O.M.;M.Nose他
通讯作者：
M.Nose他

Response of the neutral atom emissions in the low-and high-latitude magnetosheath direction to the magnetopause motion under extreme solar wind conditions

极端太阳风条件下低纬度和高纬度磁鞘方向中性原子发射对磁层顶运动的响应