Dynamics of Polar Ionosphere and Magnetosphere using SuperDARN HF Radar Network

双红外雷达网络（Dual Aur or al Radar Network，简称Dual Dual）是一个全球尺度的高频雷达网络，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可以结合起来得到高纬度等离子体对流和对流电场图。Super adaptive网络特别适合于研究磁层-电离层系统的大尺度动力学过程，例如在变化的IMF条件下对流电场的整体结构的演变，以及磁层-电离层空腔中大尺度MHD波的发展和全球范围。利用Syowa和SuperDARN高频雷达数据发现了以下有趣的特征；(1)与极光亚暴相关的夜侧磁层开合场线区域通过磁场重联过程高速移动。(2)高速等离子体流爆发发生在日侧极尖区，与南向的星际磁场有关。(3)全球尺度可见极光动力学与全球尺度等离子体对流强度及其模式的动力学行为有关。(4)高密度高温形成的等离子体斑块的运动和产生与全球尺度等离子体对流的方向和强度密切相关。(5)赤道地区电喷流的方向和强度与极地等离子体对流的增强有关。

The Dual Aur or al 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 may be combined to yield maps of high-latitude plasma convection and the convection electric filed. The Super DARN network is particularly suited to studies of large-scale dynamical processes in the magnet osphere-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.Using Syowa and SuperDARN HF radar data following interesting characteristics were found ;(1) The region of the open-close field line in the nightside magnetosphere moves very high speed associated with auroral substorm through magnetic field reconnection processes.(2) The high speed plasma flow bursts are found in the dayside Polar Cusp region associated with the southward interpoanetary field.(3) Dynamics of global scale visible aurora are relating to the dynamic behavior of global scale plasma convection intensity and their patterns.(4) Movement and generation of plasma patches which are forming with high density and high temperature are closely relating to the direction and intensity of global scale plasma convection.(5) The direction and intensity of Electro-Jet Current in the equatorial region are relating to the enhancement of polar plasma convection.