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

• 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
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15540427/
• 关键词: Remote sensing; Magnetosphere; Solar wind; Cusp; Magnetopause; Neutral atoms; Plasma convection; Reconnection; 中世粒子; マグネトシース

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.

IMAGE航天器上的低能中性原子成像仪的观测表明，高纬度磁鞘方向的发射受到调制，使发射源在高纬度磁鞘中向赤道方向/极方向移动。一个基于鞘通量和氢散逸层数密度分布的模型解释了这些特征，作为磁层顶在尖点处具有凹陷的运动的结果，提出了一种使用IMAGE/LENA监测尖点运动的方法。IMAGE/LENA和SuperDARN雷达的同步观测为这种方法提供了证据。对IMAGE和Polar同步观测的一个事件的详细分析表明，高纬鞘层发射由高纬稳定发射和低纬时断时续的发射两部分组成，尖点离子的进入与低纬LENA发射的出现同时发生。这强烈表明，LENA监测尖点以及尖点压痕中的离子的进入，并且尖点离子进入的显著通量发生在赤道方向，并且与尖点压痕分开。LENA有时还观测到极高纬度磁层顶方向的增强发射。IMAGE/LENA和SuperDARN雷达的同步观测表明，LENA辐射与电离层反向对流的向阳流增强同时出现。这表明LENA可以监测尖点重连引起的离子进入，并且重连部位在几分钟的时间尺度上移动。在半径为8 Re的球体上映射的重联“点”在波动的同时在10分钟内移动约1 Re。

项目成果

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

• 发表时间: 2005
• 期刊: Journal of Geophysical Research 110・A9
• 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

• 发表时间: 2004
• 期刊: Journal of Geophysical Reserach 109,A4
• 作者: 吉田真見子;保柳康一;卜部厚志;山崎梓;山岸美由紀;大村亜希子;S.Taguchi et al.
• 通讯作者: S.Taguchi et al.

Satoshi Taguchi 他: "Response of the neutral atom emissions in the low-and high-latitude magnetosheath direction to the magnetopause motion under extreme solar wind conditions"Journal of Geophysical Research. (印刷中). (2004)

Satoshi Taguchi 等人：“极端太阳风条件下低纬度和高纬度磁鞘方向的中性原子发射对磁层顶运动的响应”地球物理研究杂志（2004 年）。

Satoshi Taguchi 他: "Simultaneous observations of the cusp with IMAGE low energy neutral atoms imager and SuperDARN radar"Advances in Polar Upper Atmosphere Research. 18(印刷中). (2004)

Satoshi Taguchi 等人：“用 IMAGE 低能中性原子成像仪和 SuperDARN 雷达同时观测尖点”，极地高层大气研究进展 18（出版中）。

Overwheiming 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巨大贡献：Geotail/EPIC 和 IMAGE/LENA 观测

• 发表时间: 2005
• 期刊: Journal of Geophysical Research 110,A9
• 作者: M.Fujimoto;T.Mukai;S.Kokubun;M.Nose et al.
• 通讯作者: M.Nose et al.