Study on development and decay of inner magnetospheric disturbances by using ground and satellite multipoint observations

利用地面和卫星多点观测研究磁层内扰动的发展和衰减

• 批准号: 22740322
• 负责人: NOSE Masahito
• 金额: $ 2.66万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22740322/
• 关键词: 地球惑星磁気圏; 磁気嵐; 内部起因磁場; サブストーム; リングカレント; 高エネルギー酸素イオン; 粒子加速; 酸素イオントーラス; 磁場双極子化; 内部磁気圏; イオン組成; 非断熱的加速; Dst指数

The field variations during geomagnetic storms are produced by both the magnetospheric currents such as the ring current and the induced currents inside the Earth’s interior. Previous studies have reported that the magnetic field variations due to the induced currents are about 25% of the Dst index; but we found that the Earth-induced current contribution varies between 20% and 55%, and depends on the rate of change of the Dst index. With regard to ring current development, we suggest that the non-adiabatic acceleration of preexisting cold ions by magnetic fluctuations associated with dipolarization plays a more important role than the energetic particle injection from the plasma sheet into the inner magnetosphere.

磁暴期间的磁场变化是由磁层电流（如环电流）和地球内部的感应电流共同产生的。以前的研究报告，由于感应电流的磁场变化是约25%的Dst指数，但我们发现，地球感应电流的贡献在20%和55%之间变化，并取决于Dst指数的变化率。关于环电流的发展，我们认为，非绝热加速预先存在的冷离子的磁波动与偶极起着更重要的作用比高能粒子注入等离子体片到内磁层。

项目成果

Pi2 pulsations in the inner magnetosphere simultaneously observed by the Active Magnetospheric Particle Tracer Explorers/Charge Composition Explorer and Dynamics Explorer 1 satellites

主动磁层粒子示踪探测器/电荷成分探测器和动力学探测器 1 号卫星同时观测到的内磁层中的 Pi2 脉动

• DOI: 10.1029/2010ja016199
• 发表时间: 2011
• 期刊: J. Geophys. Res.
• 作者: Teramoto;M.;K. Takahashi;M. Nose;D.-H. Lee;and P. R. Sutcliffe
• 通讯作者: and P. R. Sutcliffe

Assessment of the auroral electrojet index performance under various geomagnetic conditions

• DOI: 10.1016/j.jastp.2012.09.017
• 发表时间: 2013
• 期刊: Journal of Atmospheric and Solar-Terrestrial Physics
• 影响因子: 1.9
• 作者: K. Liou;Kazue Takahashi;B. Anderson;M. Nosé;T. Iyemori

Evaluation of the earth-induced current contribution for a precise prediction of the Dst index

评估地感电流贡献以精确预测 Dst 指数

• 发表时间: 2011
• 作者: Nose;M.
• 通讯作者: M.

新しいサブストーム指数(Wp指数)のホームページ

新亚暴指数（Wp指数）主页

Geomagnetism and the orientation of temples in Thailand

地磁和泰国寺庙的方向

• 发表时间: 2011
• 期刊: J. Siam Soc
• 作者: Iyemori;T.;M. Hashizume;A. Saito;M. Nose;N. Choosakul;T. Tsuda;Y. Odagi
• 通讯作者: Y. Odagi