Auroral current system as estimated by a magnetic inversion method

通过磁反演方法估计的极光电流系统

• 批准号: 20540438
• 负责人: IEDA Akimasa
• 金额: $ 2.83万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 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-20540438/
• 关键词: 宇宙科学; 宇宙空間; 磁気圏・電離圏; 地球電磁気; 超高層物理学; オーロラ; 磁気圏尾部; 地磁気; 超高層物理額

The spatial distribution of field-aligned currents(FACs) is studied for an intense substorm. We first estimated the height-integrated ionospheric Hall and Pedersen conductances from ultraviolet images taken by the Polar satellite. To derive FACs, we then employed Ohm's law for the ionosphere, applying a magnetic inversion method to the input conductances and ground magnetic field data. As a result, the Hall FACs that are connected to the ionospheric Hall currents were aniti-correlated with the Pedersen FACs that are connected to the ionospheric Pedersen currents. Such anti-correlations were observed near the poleward and the equatorward edges of the auroral westward currents. This result indicates that the auroral current system included the Cowling channel that is the auroral westward currents enhanced by the polarization electric field in this particular event.

研究了强亚暴场向电流的空间分布。我们首先估计高度集成电离层霍尔和彼得森电导从紫外图像拍摄的极地卫星。为了获得FACs，我们采用欧姆定律的电离层，应用磁反演方法的输入电导和地面磁场数据。结果，连接到电离层霍尔电流的霍尔FACs与连接到电离层彼得森电流的彼得森FACs反相关。这种反相关性附近的极地和赤道边缘的极光向西电流。这一结果表明，在这次事件中，极光流系统中存在着由极化电场增强的向西流所形成的Cowling通道。

项目成果

FAST衛星によるオーロラサージ電流系の観測

FAST卫星观测极光浪涌电流系统

• 发表时间: 2010
• 作者: 家田章正;藤本正樹;西野真木;堀智昭;関華奈子;西村幸敏;藤井良一;海老原祐輔;町田忍;宮下幸長;向井利典;齋藤義文
• 通讯作者: 齋藤義文

Longitudinal development of a substorm brightening arc

• DOI: 10.5194/angeo-27-1935-2009
• 发表时间: 2009-05
• 期刊: Annales Geophysicae
• 影响因子: 1.9
• 作者: K. Shiokawa;A. Ieda;A. Nakajima;K. Sakaguchi;R. Nomura;T. Aslaksen;M. Greffen;E. Spanswick;E. Donovan;S. Mende;J. Mcfadden;K. Glassmeier;V. Angelopoulos;Y. Miyashita

Longitudinal association between magnetotail reconnection and auroral breakup based on Geotail and Polar observations

基于 Geotail 和 Polar 观测的磁尾重联与极光分裂之间的纵向关联

• 发表时间: 2008
• 期刊: J. Geophys. Res. 113, A08207
• 作者: Ieda;A.;他12名
• 通讯作者: 他12名

Towards understanding the electrodynamics of the 3-dimensional high-latitude ionosphere: present and future

• DOI: 10.5194/angeo-26-3913-2008
• 发表时间: 2008-12
• 期刊: Annales Geophysicae
• 影响因子: 1.9
• 作者: O. Amm;A. Aruliah;S. Buchert;R. Fujii;J. Gjerloev;A. Ieda;T. Matsuo;C. Stolle;H. Vanhamaki;A. Yoshikawa

地磁気逆計算法による電離層電流系の推定

地磁反演法估计电离层电流系统

• 发表时间: 2009
• 作者: 家田章正;上出洋介
• 通讯作者: 上出洋介