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Dynamics of Polar Ionosphere and Magnetosphere using SuperDARN HF Radar Network

使用 SuperDARN HF 雷达网络的极地电离层和磁层动力学

基本信息

批准号：
08454138
负责人：
SATO Natsuo
金额：
$ 4.29万
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 (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

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.

双 Aur 或 al 雷达网络 (DARN) 是一个全球范围的高频雷达网络，能够感测高纬度电离层 E 和 F 区域电离层不规则性的反向散射。这种高频雷达网络已部署在北极和南极地区。南极洲的昭和东雷达和南雷达就是由这个雷达网络组成的。包含在反向散射信号中的高频雷达多普勒信息可以组合起来产生高纬度等离子体对流和对流电场的图。 Super DARN网络特别适合研究磁层-电离层系统中的大尺度动力学过程，例如变化IMF条件下对流电场全局配置的演化以及磁层-电离层空腔中大尺度MHD波的发展和全局范围。利用Syowa和SuperDARN HF雷达数据发现了以下有趣的特征；（1）开闭场线区域夜侧磁层中的极光通过磁场重联过程以非常高的速度移动，与极光亚暴相关。(2)在与南向间场相关的昼侧极尖区发现高速等离子体流爆发。(3)全球尺度可见极光的动态与全球尺度等离子体对流强度及其模式的动态行为有关。(4)等离子体斑块的运动和产生，高密度、高温形成与全球尺度等离子体对流的方向和强度密切相关。(5)赤道地区电射流的方向和强度与极地等离子体对流的增强有关。