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

通过京都大学无线电大气科学中心和澳大利亚阿德莱德大学的联合研究，对中层大气动力学进行了研究。京都（35 N，136 E）和阿德莱德（35 S，138 E）位于地理上的共扼点上，这一位置适合于研究全球尺度大气波动的纬度结构。1987年5月15日至1987年7月22日期间在Adclaide大学进行了这项联合研究，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一直在观测中高层和低热层（80-100公里）的风。对两台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日波在两半球间表现出反对称性，在阿德莱德的振幅比其大4倍，而在阿德莱德的日潮振幅通常比其大得多，在那里传播的（1，1）模的贡献相对较大。半日潮的特征在两个位置吻合得很好。反对称（2，3）模的贡献很大. MU雷达和阿德莱德部分反射雷达进行了合作观测，以研究大气重力波的行为。阿德莱德大学于1987年6月5-14日和6月22-30日获得了这些数据。MU雷达在1987年6月6日至29日期间连续运行。研究了阿德莱德大学的部分反射雷达和ST雷达的系统结构和观测程序。同时，利用MU雷达资料和计算机模拟技术，对风速测定中的系统误差和随机误差进行了评估。

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.