黄河站和Tromso站亚暴期间热层风场观测结果  

Thermospheric Wind over Chinese Yellow River Station and Tromso during Auroral Substorm

作　　者：吴鹏举 张燕革[1] 艾勇[1] WU Pengju;ZHANG Yange;Al Yong(School of Electronic Information, Wuhan University, Wuhan 430072)

机构地区：[1]武汉大学电子信息学院,武汉430072

出　　处：《空间科学学报》2019年第2期178-185,共8页Chinese Journal of Space Science

基　　金：国家海洋局极地考察办公室对外合作项目资助(201606)

摘　　要：中高层大气风场探测对研究大气物理过程具有极为重要的意义,尤其是在极地地区,风场对大气结构的影响更为剧烈.针对亚暴期间中国北极黄河站和日本Tromso站上空OI557.7nm气辉层(低热层)中性风场,利用全天空法布里-珀罗干涉仪(all-sky Fabry-Perot Interferometer, all-sky FPI)探测气辉谱线的多普勒频移,反演气辉层的大气风场信息.结果表明,低热层风场平均水平在100 m·s^(-1)左右,热层风场在极地地区更为剧烈,纬度相对较低的Tromso站探测到的风速整体小于同期黄河站上空的风速.结合离子风数据,分析离子拖拽和焦耳加热对中性风的影响过程,发现极光亚暴不仅对低热层风场有增强作用,也有明显的抑制效果,但整体风向都垂直于极光弧变化.The wind detection for the middle and upper atmosphere is of great significance to the study of atmospheric physical processes. In the polar region, atmospheric structure changes more quickly. By the all-sky Fabry-Perot interferometer, the Doppler shift of the airglow can be detected to retrieve the wind velocity at the airglow layer. In this paper, the neutral wind is studied at the OI557.7 nm oxygen-atom layer in the Arctic Yellow River Station and the Tromso Station during a substorm. The average wind velocity is about 100 m·s-1 in the lower thermosphere. Due to the geomagnetic distribution, the thermospheric wind velocity increases sharply in the polar region.Finally, considering ion drift data, the influence of ion drag and Joule heating on the neutral wind is discussed. The results show that auroral substorm would not only make the wind stronger in the lower thermosphere but also inhibit it. Moreover, the wind velocity is perpendicularly to the auroral arc generally.

关 键 词：法布里-珀罗干涉仪 热层中性风场 极光亚暴 离子拖曳 焦耳加热 

分 类 号：P353[天文地球—空间物理学]