Study on electromagnetic environment using EISCAT radar

利用EISCAT雷达研究电磁环境

基本信息

批准号：
10045033
负责人：
ASO Takehiko
金额：
$ 4.35万
依托单位：
NATIONAL INSTITUTE OF POLAR RESEARCH
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

In the 1^<st> year, a collaborative research work with Univ. Tromso on the atmospheric tide and gravity wave behaviors in the polar mesosphere and lower thermosphere was made by using the EISCAT radar observation and data. In March, 1999 a conjunctive and conjugate observation of high-latitude auroras by EISCAT, HF radars, satellites as FAST and GEOTAIL and ground-based optics was carried out in this project and interesting substorm event was successfully captured. In the 2^<nd> year of this project, an intensive study on the electrodynamics of aurora in the polar cap region was started by using the conjunctive observation data to find out possible mechanisms of substorms and relevance of strong arc, electric field and field-aligned current. An analysis of tidal features in the polar mesospheric regions indicates existence of diurnal propagating tide at higher latitudes. A study on the ionospheric trough morphology and detailed analysis of plasma lines were also made. Auroral tomography and HF radar campaign runs were carried out in conjunction with the EISCAT radar, and auroral/airglow spectrograph observation has started its operation to be in close collaboration with EISCAT radar run. In the last year, ion-drag induced neutral instability based on the EISCAT radar data and global feature of atmospheric tide such as assumed contribution of non-migrating semidiurnal tides by using EISCAT long run data in August, 1999 and other radar data has been put to people's attention along with collaborations on SOUSY radar study of gravity wave and turbulence in the stratosphere and analysis of PMSE data by the EISCAT radar. Tomographic reconstruction of heating-induced airglow was also done through collaborative researches. A new meteor radar observation and temperature measurement by airglow spectrograph have also been undertaken to contribute to the coordinated observation of arctic environmental study by the EISCAT radar.

在第一年，与大学的合作研究工作。特罗姆瑟对极地中间层和低层热层的大气潮汐和重力波行为的研究是利用EISCAT雷达观测和数据进行的。 1999年3月，该项目利用EISCAT、高频雷达、FAST、GEOTAIL等卫星以及地基光学系统对高纬度极光进行了联合共轭观测，成功捕捉到了有趣的亚暴事件。在该项目的第二年，利用联合观测数据，开始对极冠地区极光的电动力学进行深入研究，以找出亚暴可能的机制以及强电弧、电场和场的相关性。 - 对齐电流。对极地中气层区域潮汐特征的分析表明，高纬度地区存在日间传播潮汐。还对电离层槽形态进行了研究，并对等离子体线进行了详细分析。极光断层扫描和高频雷达活动运行是与 EISCAT 雷达联合进行的，极光/气辉摄谱仪观测已开始与 EISCAT 雷达运行密切合作。去年，根据EISCAT雷达数据和大气潮汐的全球特征，例如使用1999年8月的EISCAT长期数据和其他雷达数据假设的非迁移半日潮的贡献，离子拖曳引起的中性不稳定性已被提出随着SUSY雷达研究平流层重力波和湍流以及EISCAT雷达PMSE数据分析的合作而引起人们的关注。热诱导气辉的断层扫描重建也是通过合作研究完成的。还进行了新的流星雷达观测和气辉摄谱仪温度测量，以促进 EISCAT 雷达对北极环境研究的协调观测。