Experimental study of the plasma acceleration/heating by large-amplitude Alfven waves in the space

空间大振幅阿尔文波加速/加热等离子体的实验研究

• 批准号: 21540465
• 负责人: MATSUOKA Ayako
• 金额: $ 2.58万
• 依托单位: Japan Aerospace Exploration Agency
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21540465/
• 关键词: 地球惑星磁気圏; プラズマシート; 磁気圏; アルフベン波; イオンサイクロトロン不安定

Alfven waves were found to propagate toward the earth in the nightside magnetosphere. They are considered to be associated with the auroral activity at the ionospheric altitudes. We have investigated the electric and magnetic field variations measured by Geotail in the mid-tail region, 10-30 Re. We found large-amplitude electric field fluctuations and the corresponding magnetic field fluctuations having the components in the direction perpendicular to the ambient magnetic field. These fluctuations were identified as Alfven waves from the ratio between the amplitudes of electric and magnetic field. These large-amplitude Alfven waves often propagate in the direction coincides with the plasma flow, and earthward at the same time. We will further select events in which the fluctuations are identified as waves definitely. We will report the statistical result about the correspondence with the plasma properties and estimation of the energy flux carried by the Alfven waves.

在夜间磁层中发现Alfven波在朝向地球传播。它们被认为与电离层高度处的极光活性有关。我们已经调查了中尾区域中晶状锯测量的电场变化，10-30 RE。我们发现大振幅电场波动和相应的磁场波动具有垂直于环境磁场的方向的组件。这些波动被确定为电场幅度和磁场幅度之间的比率的Alfven波。这些大振幅的alfven波通常会沿方向传播，同时与血浆流相吻合。我们将进一步选择将波动确定为波浪的事件。我们将报告有关与血浆特性的对应关系的统计结果以及Alfven波携带的能量通量的估计。

项目成果

Estimation of the Electromagnetic Energy Carried by the Alfven waves Traveling in the Plasma Sheet

等离子体片中传播的阿尔文波携带的电磁能的估计

• 发表时间: 2010
• 作者: 松岡彩子;高田拓;星野真弘
• 通讯作者: 星野真弘

Development of fluxgate magnetometers and applications to the space science missions

磁通门磁力计的开发及其在空间科学任务中的应用

• 发表时间: 2012
• 期刊: Science Instruments for Sounding Rocket and Satellite
• 作者: Matsuoka A.;M.Shinohara;Y.Tanaka;A.Fujimoto;K.Iguchi
• 通讯作者: K.Iguchi

磁気圏尾部において電磁的エネルギーを伝播するアルフベン波の空間スケールの推定

估计在磁尾中传播电磁能的阿尔芬波的空间尺度

• 发表时间: 2009
• 作者: 松岡彩子;高田拓;星野真弘
• 通讯作者: 星野真弘

Examination of Magnetic Field Measurement in the Inner Magnetosphere by ERG

ERG 对内磁层磁场测量的检验

• 发表时间: 2012
• 作者: Nakamura;M.;Y. Kawakatsu;C. Hirose;T. Imamura; N. Ishii;T. Abe;A. Yamazaki;M. Yamada;K. Ogohara;K. Uemizu;T. Fukuhara;S. Ohtsuki;T. Satoh;M. Suzuki;M. Ueno;N. Iwagami;S. Watanabe;Y. Takahashi;G.L. Hashimoto and H. Yamamoto;Ayako Matsuoka
• 通讯作者: Ayako Matsuoka