【作者】 尹羽菲； 杨溶； 宋欣； 战兴群；

【Author】 YIN yufei;YANG rong;SONG xin;ZHAN xingqun;School of Aeronautics and Astronautics.Shanghai Jiao Tong University;

【机构】 上海交通大学；

【摘要】 电离层闪烁是由电离层不规则体引起的穿过不规则电离层的无线电信号的幅度和相位的剧烈变化现象,在磁暴发生期间,闪烁现象更为明显。由于其会对卫星通信和导航系统的性能产生影响,所以研究电离层闪烁具有十分重要的意义。本文利用2017年多种低轨卫星的观测数据,研究了2017年9月地磁风暴期间全球电离层闪烁指数S4的变化以探究电离层闪烁的规律,通过对比两种计算S4的方法—滑动平均值法和CDAAC官网提供的计算方法,选择更加稳定的一种并在分析时应用,结果表明CDAAC官网提供的方法更加准确;同时,选择四类低轨卫星(GRACE, TSX, COSMIC, Metop-A),并根据不同的卫星轨道高度,探究340km以上、520km以上以及800km以上S4的变化,并采用实测数据(CDAAC(Cosmic Data Analysis and Archive Center)官网提供的S4的数值)进行对比。结果表明,2017年磁暴期间,亚欧板块,太平洋板块以及南极洲板块是电离层闪烁高发的区域,且在南极洲区域,闪烁现象出现西向漂移趋势。更多还原

【Abstract】 Ionospheric scintillation is a phenomenon of dramatic temporal changes in the magnitude and phase of the radio signal caused by ionosphere irregularities, which is more pronounced during Geomagnetic storms.Given its impact on the performance of satellite communication and navigation systems, it is of great importance to study ionospheric scintillation. At present, the study of ionospheric scintillation is mainly about the law of scintillation through the observation of a large amount of data, but the study of scintillation with low-rate observations is lacking. In this paper, we use observations from low-orbit satellites in 2017 to study the variation of the global ionosphere scintillation index S4 during the September 2017 geomagnetic storm to explore the feature of Ionospheric scintillation. By comparing the two methods for S4 calculation-sliding average method and Calculation method provided on the CDAAC, a more stable one was selected and applied in the analysis. The results show that the method provided by CDAAC(Cosmic Data Analysis and Archive Center) official website is more accurate. Meanwhile, using four kinds of satellites(GRACE, TSX, COSMIC, Metop-A),according to different satellite heights, we explore the changes of S4 over 340 km, 520 km and 800 km,combined with the measured data of S4(CDAAC) to make final analysis. The results show that during the 2017 storm, the ionospheric scintillation occurred in the Eurasian plate, Pacific plate and Antarctic plate more frequently, and the scintillation shifted westward in the Antarctic region.更多还原