Unified Theory of the Arc Auroras: Formation Mechanism of the Arc Auroras Conforming General Principles of Convection and FAC Generation

T. Tanaka; M. Watanabe; Y. EbiharaS. FujitaN. NishitaniR. Kataoka

首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Unified Theory of the Arc Auroras: Formation Mechanism of the Arc Auroras Conforming General Principles of Convection and FAC Generation

【24h】

Unified Theory of the Arc Auroras: Formation Mechanism of the Arc Auroras Conforming General Principles of Convection and FAC Generation

机译：Unified Theory of the Arc Auroras: Formation Mechanism of the Arc Auroras Conforming General Principles of Convection and FAC Generation

获取原文

获取原文并翻译 | 示例

掌桥外文数据库（机构版） >>

开具论文收录证明 >>

文献代查 >>

页面导航

摘要
著录项
相关主题

摘要

The arc aurora can be considered as the visualization of the field-aligned current (FAC). In various cases, the numerically reproduced FAC morphologically matches well with that of the observed arc aurora. Such example can be seen in the sun-aligned arc, the fan arc, and the theta aurora under the northward interplanetary magnetic field (IMF), and the substorm, the quiet arc, and the initial brightening under the southward IMF. The FAC reproduced by the global simulation is based on the general principle of the magnetohydrodynamic (MHD). In such general principle, the FAC is transmission of net charge, net charge is divE, and E is equivalent to motion. After all, the FAC is transmission of convection motion. In order to transmit the FAC to the dissipative ionosphere based on the MHD, formations of the dynamo and shear that leads from the magnetosphere to the ionosphere are essential. The dynamo and shear are reproduced so as to properly match with each convection structure. The comparison under various magnetospheric topologies between the global simulation and the arc aurora observation indicates that the arc aurora and the FAC occurs inevitably controlled by convection structure. Such a principle of the FAC and convection holds even for the onset FAC.

著录项

来源
《Journal of Geophysical Research, A. Space Physics: JGR》 |2022年第9期|e2022JA030403-1-e2022JA030403-24|共24页
作者
T. Tanaka; M. Watanabe; Y. EbiharaS. FujitaN. NishitaniR. Kataoka;
展开▼
作者单位

International Center for Space Weather Science and Education, Kyushu University, Fukuoka, Japan;

The Institute of Statistical Mathematics, Tachikawa, Japan;

Institute of Space-Earth Environmental Research, Nagoya University, Nagoya, JapanSpace and Upper Atmospheric Group, National Institute of Polar Research, Tachikawa, JapanResearch Institute for Sustainable Humanosphere, Kyoto University, Uji, Japan;

展开▼
收录信息
原文格式 PDF
正文语种英语
中图分类空间物理;地球物理学;
关键词
Unified; The arc; FAC;

Unified Theory of the Arc Auroras: Formation Mechanism of the Arc Auroras Conforming General Principles of Convection and FAC Generation

摘要

著录项

相关主题

期刊订阅