Interhemispheric conjugate studies on polar electromagnetic dynamics using SuperDARN HF radars

超级双极光雷达网(SuperDARN)是一个全球范围的高频雷达网络，能够监测高纬度电离层E区和F区电离层不规则性的后向散射。这种高频雷达网已部署在北极和南极地区。南极洲的森苏、西奥瓦、东、南雷达组成了这个雷达网。结合后向散射信号中包含的高频雷达多普勒速度信息，得到了高纬等离子体对流和对流电场分布图。利用SuperDARN网络数据，研究了极地电离层中磁层-电离层耦合过程中观测到的各种大、中尺度现象/动力学，得到了以下结果：1)利用SUNSE Syowa雷达获得的近程回波，首次在南极地区探测到极地中层夏季回波现象；2)发现了…存在两种不同物理模式的新证据更多或与行星际磁场变化有关的电离层响应，3)发现等离子体流爆发事件发生在较宽的纵向区域(延伸超过5MLT)的证据，4)利用Super Darn多普勒速度数据推算二维场向电流的新方法，5)通过同时观测GeoTail卫星/EIACAT加热器/Super Darn，Pc3-5磁脉冲的产生和传播特性/机制，6)Sense Syowa雷达和Cutlass雷达获得的Pc3-4磁脉冲的局部化和非共轭现象，7)谱宽边界的半球间共轭及其与星载电磁场变化的关系；8)利用原始信号发展了一种新的时间序列模式。将该模式应用于流星回波，发现该方法探测到的中间层中性风速与中频雷达探测到的中性风速度一致。这些科学成果已在国际研讨会/会议上发表，并发表在国际科学期刊上。较少

The Super Dual Auroral Radar Network (SuperDARN) 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. SENSU Syowa East and South radars in Antarctica consist of this radar network. The HF radar Doppler velocity 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 various large-scale and meso-scale phenomena/dynamics observed in the polar ionosphere, which occur by the processes of the magnetosphere-ionosphere coupling, and produced following results;1) Polar mesospheric summer echo (PMSE) phenomena has been firstly detected in Antarctic region using the near range echo obtained by the SUNSE Syowa radars, 2) Finding new evidences that there are two different physical modes f … More or the responses of ionosphere in association with the interplanetary magnetic field changes, 3) Finding evidences that plasma flow burst events occur in wider longitudinal region (extending more than 5 MLT) in the dayside polar cusp region, 4) A new method to deduce two dimensional field-aligned current using the Super DARN Doppler velocity data, 5) Generation and propagation characteristics/mechanism of Pc 3-5 magnetic pulsations by conducting the simultaneous observations of Geotail satellite/EIACAT heater/Super DARN, 6) Localized and non-conjugate phenomena of Pc 3 -4 magnetic pulsation obtained by SENSE Syowa radars and CUTLASS radars, 7) Interhemispheric conjugacy of the spectral width boundary and their relation to the electromagnetic field variations obtained onboard satellite, 8) A new mode of TMS (time series) has been developed using original signals. This mode has been applied to the meteor echoes and found that the velocity of the neutral wind in the mesosphere detected by this method was consistent with that detected by MF radar.These scientific results have been presented in the international workshops/meetings and also published to International scientific journals. Less