2017-09-07-08磁暴期间全球尺度电离层扰动  

Global Scale Ionospheric Disturbance during the September 7-8,2017 Geomagnetic Storm

作　　者：王金勇 陈必焰[1] 曹恒瑞 WANG Jinyong;CHEN Biyan;CAO Hengrui(School of Geosciences and Info-Physics,Central South University,932 South-Lushan Road,Changsha 410083,China)

机构地区：[1]中南大学地球科学与信息物理学院,长沙市麓山南路932号,410083

出　　处：《大地测量与地球动力学》2023年第12期1261-1268,共8页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(42274042,41904032);湖南省自然科学基金(2022JJ30697,2023JJ20060);湖南省自然资源厅科技项目(20230167CH)。

摘　　要：基于全球6个CORS系统和IGS共2 645个站点的观测数据以及欧洲定轨中心(CODE)的全球电离层格网数据,利用电离层层析技术重构2017-09-07-08磁暴期间全球范围电离层电子密度变化情况。分析发现,2次电离层扰动均始于磁暴发生约1 h后,并随着磁暴的恢复而减小,二者发展趋势有强相关性。电离层扰动遍布全球,存在明显的赤道电离层异常现象。总体来看,低纬度地区电离层扰动强度大于中高纬度区域,200-400 km高度中层区域电离层扰动强度大于底层和高层,电子密度变化量达(3.3-9.4)×10^(5) el/cm^(3)。第1次磁暴恢复相期间,低纬度地区仍存在较强电离层扰动;第2次磁暴恢复相期间,电离层扰动呈现南北半球不对称现象,北半球电子密度减少,南半球电子密度增加。Using the observational data and global ionosphere maps provided by 2645 stations from six CORS systems,IGS and Center for Orbit Determination in Europe,we restructure the global ionospheric electron density variations during the geomagnetic storm on September 7—8,2017 by computerized ionospheric tomography.Further analysis finds the two ionospheric disturbance both begin about 1 h after the occurrence of the geomagnetic storm,and decrease with the recovery of the geomagnetic storm,and that there is a strong correlation between the two development trends.Ionospheric disturbance spreads all over the world.In general,the intensity at low-latitude regions is greater than that of medium-high latitude regions,the intensity of middle height region(200-400 km)is greater than that of the lower and upper layers,and the change of electron density is(3.3-9.4)×10^(5) el/cm^(3).There is still strong ionospheric disturbance in the low latitude area during the first geomagnetic storm recovery phase.In the recovery phase of the second magnetic storm,the ionospheric disturbance shows asymmetry in the north and south hemisphere,the electron density in the northern hemisphere decreased,but increased in the southern hemisphere.

关 键 词：磁暴 电离层扰动 电离层层析技术 全球尺度 电子密度变化量 

分 类 号：P228[天文地球—大地测量学与测量工程]