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Conjugate study on electromagnetic dynamics of polar ionosphere using SuperDARN HF radars and ground-based observations

利用 SuperDARN HF 雷达和地面观测对极地电离层电磁动力学进行共轭研究

基本信息

批准号：
09044106
负责人：
SATO Natsuo
金额：
$ 17.79万
依托单位：
National Institute of Polar Research
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A).
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

The Dual Auroral Radar Network (DARN) is a global-scale network for HF radars capable of sensing backscatter from ionospheric irregularities in the E and F-regions of the high-latitude ionosphere. Such HF radar network has been deployed in Arctic and Antarctic regions. Syowa East and South radars in Antarctica consist of this radar network. The HF radar Doppler information contained in the backscattered signals has combined to yield maps of high-latitude plasma convection and the convection electric filed. Using the SuperDARN network data we studied on large-scale dynamical processes in the magnetosphere-ionosphere system, such as the evolution of the global configuration of the convection electric field under changing IMF conditions and the development and global extent of large-scale MHD waves in the magnetosphere-ionosphere cavity.Observations of conjugacy and non-conjugacy of auroral phenomena give us useful information on the generation and propagation mechanism of aurora. There a … More re however very few conjugate pairs of observations in the northern and southern polar regions. Fortunately, Syowa Station in Antarctica is located very close to (〜 less than 100 km) the geomagnetically conjugate station of Husafell in Iceland, making an ideal pair of conjugate stations in the auroral zone. The auroral zone is located in the boundary region between open and closed field lines, where many intense auroral phenomena occur. Conjugate observations in our study, such as studies ot the exact location of conjugate points and their movements, the movement of conjugate auroras, on-off phase relation of pulsation aurora, the onset time difference or auroral breakup and substorm at conjugate points etc., should help us to infer the physical nature of auroral phenomena which occur between the magnetosphere and the ionosphere.We also examined the multi-instrument observations among SuperDARN radars, optical observation at Zhongshan and South Pole Stations in Antarctica, Geotail satellites, and EISCAT radars, Less

双极光雷达网（Dual aurora Radar Network，简称Dual aurora Radar Network，简称Dual aurora Radar Network）是一个全球性的高频雷达网络，能够探测高纬度电离层E区和f区电离层不规则的反向散射。这种高频雷达网已在北极和南极地区部署。该雷达网由位于南极洲的Syowa东部和南部雷达组成。后向散射信号中包含的高频雷达多普勒信息结合起来，得到高纬度等离子体对流和对流电场图。利用SuperDARN网络数据，研究了磁层-电离层系统的大尺度动力学过程，如在变化的IMF条件下对流电场的整体结构演变，以及磁层-电离层空腔中大尺度MHD波的发展和全球范围。对极光现象共轭和非共轭现象的观测为我们提供了有关极光产生和传播机制的有用信息。然而，在南北两极地区很少有共轭观测对。幸运的是，南极的Syowa站距离冰岛的Husafell地磁共轭站非常近（~不到100公里），是极光区一对理想的共轭站。极光带位于开场线和闭场线之间的边界区域，在这里会发生许多强烈的极光现象。我们研究中的共轭观测，如共轭点的确切位置及其运动、共轭极光的运动、脉动极光的开关相位关系、共轭点的极光破裂和亚暴的发生时间差等，将有助于我们推断发生在磁层和电离层之间的极光现象的物理性质。本文还分析了superdam雷达、中山站和南极站光学观测、Geotail卫星和EISCAT雷达的多仪器观测结果