Study of geospace storms based on a new observation-based model of the inner magnetosphere

基于新的内磁层观测模型的地球空间风暴研究

• 批准号: 20340134
• 负责人: SEKI Kanako
• 金额: $ 11.56万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2008
• 资助国家: 日本
• 起止时间: 2008 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20340134/
• 关键词: 太陽地球システム; 宇宙天気; 磁気嵐(宇宙嵐); リングカレント; 内部磁気圏; ドリフト運動論近似; マクスウェル方程式; ボルツマン方程式; 放射線帯; 粒子加速

A new self-consistent and kinetic model for ring current particles in the inner magnetosphere is presented. A closed set of nonlinear time evolution equations is derived that incorporates kinetic particle dynamics and self-consistent development of the electromagnetic field. The particle transport is described by a five-dimensional collisionless drift kinetic equation, in which particle trajectories are approximated by their guiding centers under the influence of a time-dependent electromagnetic field. The time evolution of the electromagnetic field follows the Maxwell equations with the feedback from particles through electric currents. A numerical simulation code solving the system of equations in a global inner magnetosphere in three spatial dimensions(or five dimensions in phase space) is developed. It is demonstrated that the propagation of low-frequency plasma waves can successfully be described by the developed model. It is also found that the self-consistent coupling could affect the transport of energetic particles especially at low energies as well as the intensity and spatial distribution of field-aligned currents. These preliminary results suggest the importance of the self-consistent coupling in the global development of geomagnetic storms. Our approach extends the capability of modeling storm time phenomena occurring in the inner magnetosphere. These include sudden commencements(SCs), substorms, and ULF waves, and other associated phenomena.

提出了一个新的内磁层环电流粒子自洽动力学模型。一组封闭的非线性时间演化方程，推导出结合动力学粒子动力学和自洽发展的电磁场。粒子输运由五维无碰撞漂移动力学方程描述，其中粒子轨迹由它们在随时间变化的电磁场的影响下的引导中心近似。电磁场的时间演化遵循麦克斯韦方程，其中粒子通过电流反馈。开发了一个三维（或五维相空间）求解全球内磁层方程组的数值模拟程序。结果表明，低频等离子体波的传播可以成功地描述所开发的模型。研究还发现，自洽耦合可以影响高能粒子的输运，特别是在低能量下，以及场向电流的强度和空间分布。这些初步结果表明自洽耦合在全球磁暴发展中的重要性。我们的方法扩展了模拟磁暴时间现象发生在内磁层的能力。这些包括突然开始（SC），亚暴和ULF波，以及其他相关现象。

项目成果

Self-consistent drift-kinetic numeical ring-current modeling : Five-dimensional Vlasov-Maxwell approach

自洽漂移动力学数值环流建模：五维 Vlasov-Maxwell 方法

• 发表时间: 2012
• 作者: T.Amano;K.Seki;Y.Miyoshi;他4名
• 通讯作者: 他4名

宇宙嵐時の高エネルギー粒子変動:ジオスペース環境の実証型モデリングGEMSIS

空间风暴期间的高能粒子涨落：地球空间环境 GEMSIS 的经验建模

• 发表时间: 2010
• 作者: 関華奈子、三好由純、天野孝伸;ほか
• 通讯作者: ほか

Cross-scale coupling in the auroral acceleration region

• DOI: 10.1029/2011gl049185
• 发表时间: 2011-10-18
• 期刊: GEOPHYSICAL RESEARCH LETTERS
• 影响因子: 5.2
• 作者: Chaston, C. C.;Seki, K.;Carlson, C. W.
• 通讯作者: Carlson, C. W.

Investigation of particle acceleration and transport in Geospace : The ERG project and related pre-launch activities for integrated data analysis and modeling

地球空间中粒子加速和传输的研究：ERG 项目和相关的集成数据分析和建模的启动前活动

• 发表时间: 2008
• 作者: K. Seki;Y. Miyoshi;Y. Ebihara;et al
• 通讯作者: et al

Coordinated EISCAT Svalbard radar and Reimei satellite observations of ion upflows and suprathermalions

EISCAT 斯瓦尔巴雷达和 Reimei 卫星对离子上流和超热离子的协调观测

• 发表时间: 2008
• 期刊: Journal of Geophysical Research 113
• 作者: Oyama;S.;T.T.Tsuda;T.Sakanoi;Y.Obuchi;K.Asamura;M.Hirahara;A.Yamazaki;Y.Kasaba;R.Fujii;S.Nozawa;B.J.Watkins;遅沢壮一・渡邊康志;日本地質学会編;日本地質学会編(日高変成帯について志村俊昭が分担執筆);Y. Ogawa
• 通讯作者: Y. Ogawa