Japan-Australia cooperative radar study on middle atmosphere dynamics at conjugate points

日本京都大学射电大气科学中心和澳大利亚阿德莱德大学联合研究了中大气动力学。京都（35 N, 136 E）和阿德莱德（35 S, 138 E）位于地理共轭点，适合研究全球尺度大气波的纬度结构。这项在阿德克莱德大学进行的联合研究于1987年5月15日至1987年7月22日期间进行，取得了下列结果：自1983年以来，京都流星雷达和阿德莱德部分反射雷达连续运行，观测上层中间层和下层热层（80-100公里）的风。对两个雷达进行了对比观测，研究了平均风、长周期振荡和太阳潮汐的行为。准2天波在两个半球之间表现出不对称，其振幅是阿德莱德的四倍。在阿德莱德，日潮的振幅通常要大得多，其中传播（1,1）模式的贡献相对较大。两地的半日潮特征吻合较好。反对称（2,3）模式有很强的贡献。利用MU雷达与阿德莱德部分反射雷达进行合作观测，研究了大气重力波的特性。阿德莱德大学获得了1987年6月5日至14日和6月22日至30日的数据。MU雷达在1987.3年6月6日至29日连续工作。研究了阿德莱德大学部分反射雷达和ST雷达的系统结构和观测过程。同时，利用雷达数据和计算机模拟技术对风速测定的系统误差和随机误差进行了评价。

The middle atmosphere dynamics was studied through joint research between Radio Atmospheric Science Center, Kyoto University, and the University of Adelaide, Australia. Kyoto (35 N, 136 E) and Adelaide (35 S, 138 E) are located at the geographically conjugate points, which situation is suitable to study the latitude structure of global scale at-mospheric waves. This joint research at the University of Adclaide was conducted in the period from 15 May 1987 to 22 July 1987, and the following results were obtained.1. Since 1983, the Kyoto meteor radar and the Adelaide partial re-flection radar were continuously operated to observe winds in the upper mesosphere and lower thermosphere (80-100 km). Com-parison observations between the two radars were made to study the behavior of the mean wind, long period oscillations, and solar tides. The quasi-2-day wave shows antisymmetry between the two hemispheres, and its amplitude is four times larger at Adelaide.The diurnal tide is usually much larger in amplitude at Adelaide, where the contribution from the propagating (1,1) mode was rel-atively larger. The characteristics of the semidiurnal tide agree well at the two locations. There are strong contributions from the antisymmetric (2,3) mode.2. Cooperative observations between the MU radar and the Adelaide partial reflection radar was conducted to study the behavior of atmospheric gravity waves. University of Adelaide obtained the data during 5-14 June and 22-30 June, 1987. The MU radar was operated continuously during 6-29 June, 1987.3. The system configuration and the observational procedures of the partial reflection radar as well as the ST radar of University of Adelaide were studied. Also, the systematic and random errors in the wind velocity determination were evaluated using the MU radar data and the computer simulation technique, together.