Relation between Changes in the Arctic Middle and Upper Atmosphere and Influences of Solar Particles

[极光区等离子体的研究]自1993年以来，在挪威特罗姆斯菲大学与特罗姆斯菲大学极光观测站小组的合作下，对总电子含量（TEC）进行了观测。TEC是通过测量GPS信号在L1和L2两个载波无线电波上的传播时间延迟差异而获得的，这使我们有可能研究TEC的日常变化。利用特罗姆斯菲EISCAT雷达观测到的电子密度谱，导出了沉淀粒子的能谱。通过与DMSP卫星在接近雷达站的路径上直接观测到的能量谱的比较，表明采用EISCAT雷达技术具有相当好的可靠性。[极地中高层大气动力学和化学的研究]e区热层风是由离子运动数据导出的。更多的n、电子密度和电场用EISCAT雷达观测到。在安静和扰动条件下，雷达观测得到的风的比较显示了日风和半日风模式的差异。从理论上研究了中高层大气中水蒸气的循环及相关的离子化学。与EISCAT科学协会在斯瓦尔巴德IS雷达项目上的合作取得了进展。1994年8月31日至9月3日在日本举行的“日本- eiscat极地电离层研讨会”论文集已于1995年出版。1995年，日本政府批准向国家极地研究所提供财政支助，用于建造斯瓦尔巴群岛雷达天线。我们与NIPR合作，为日本加入EISCAT科学协会做准备。开发了处理GPS-TEC和EISCAT雷达数据的数据分析系统，数据库正在建设中。少

[Study on Plasma in the Auroral Region]Observation of total electron content (TEC) has been carried out since 1993 at University of Tromsphi, Norway under collaboration with the group of the Auroral Observatory, University of Tromsphi. The TEC has been obtained from measurement of difference in propagation time delays between GPS signals on the two carrier radio waves of L1 and L2, and they have made us possible to investigate day-to-day variabilities in TEC.Energy spectra of precipitating particles have been derived from the electron density profiles observed with the EISCAT radar at Tromsphi. Comparison between the energy spectra obtained from the radar and those directly observed with the DMSP satellite on the paths close to the radar site indicates a reasonably well reliablity of the technique using the EISCAT radar.[Study on Dynamics and Chemistry of the Middle and Upper Atmosphere in the Polar Region]Thermospheric winds in the E-region have been derived from the data of ion motio … More n, electron density and electric field observed with the EISCAT radar. Comparison of the winds obtained from the radar observations during both in quiet and disturbed conditions shows differences in winds of the diurnal and semi-diurnal modes. Circulation of water vapor and related ion chemistry in the middle and upper atmosphere have been theoretically studied.[Study on Svalbard IS Radar Project]Collaboration with the EISCAT Scientific Association on the Svalbard IS Radar Project has been made progressed. Proceedings of the 'Japan-EISCAT Symposium on the Polar Ionosphere' held in Japan on August 31-September 3,1994 have been published in 1995. Financial support by the Japanese Government for construction of an antenna of the Svalbard radar has been approved in 1995 to the National Institute of Polar Research. We have collaborated with the NIPR in preparation for the joining of Japan to the EISCAT Scientific Association. A data analysis system for processing the data of GPS-TEC and EISCAT radar has been developed and the database is under construction. Less