Study of polar ionosphere and magnetosphere dynamics based on SuperDARN time series analysis technique

在这项研究中，我们升级了SuperDARN时间序列分析技术[Yukimatu and Tsutsum，2002]，增加了提高空间分辨率的新功能，并开发了观测新目标的技术，如流星和极地中间层夏季回波。1.SuperDARN操作软件新增了两项提高距离分辨率的技术：频域干涉仪(FDI)和过采样。这些技术首先应用于流星回波观测，并被证明对极地中间层动力学的研究是有用的。值得注意的是，这次流星观测可以与现有的SuperDARN F区观测一起进行，完全不影响它。目前正在寻求极地中间层区域的网络观测。将FDI技术进一步应用于Cutlass SuperDARN雷达(冰岛和芬兰)，以研究位于特罗姆索的电离层加热设施产生的不规则性的微小空间和时间特征。2.我们开始开发使用Syowa站SuperDARN雷达的多接收器成像技术。20个天线输出中的每一个都新增加了一个数字接收器。正在开发控制这些接收器的软件，以研究电离层回波的精细结构。3.研究了极地中间层夏季回波(PMSE)，开发了从近程数据中检测它们的算法。利用北极和南极地区的15个SuperDARN雷达，发现北极和南极的PMSE的出现率不同，并且随着纬度的增加，PMSE的出现率也呈现出较高的值。

In this study we upgraded the SuperDARN time series analysis technique [Yukimatu and Tsutsumi, 2002] by adding new capabilities to improve spatial resolutions, and also developed techniques to observe new targets such as meteors and polar mesosphere summer echoes.1.Two techniques to improve the range resolution were newly added to the SuperDARN operating software; frequency domain interferometer(FDI) and oversampling. These techniques were first applied to meteor echo observations and proved to be useful for the study of polar mesosphere dynamics. It is notable that this meteor observation can be conducted together with the existing SuperDARN F-region observation and does not affect it at all. Network observation of polar mesosphere region is now being sought. The FDI technique was further applied to CUTLASS SuperDARN radars (Iceland and Finland) to study the minute spatial and time characteristics of irregularities which were generated by the ionosphere heating facility located at Tromso.2.We started to develop a multi receiver imaging technique using Syowa station SuperDARN radars. A digital receiver was newly added to each of the 20 antenna outputs. Softwares to control these receivers are being developed to study fine structures of ionospheric echoes.3.Polar mesosphere summer echoes (PMSEs) were studied by developing algorithms to detect them from near range data. Using 15 SuperDARN radars in Arctic and Antarctic regions, the occurrence rates of PMSEs were found to be different between Arctic and Antarctic and also show higher values with increasing latitudes.