磁暴期全球电离层电子含量变化分析研究

Analysis of global ionospheric electron content changes during magnetic storm

电离层电子含量(TEC)受太阳活动影响较大,磁暴发生时,TEC变化在全球范围内变化不一,研究该时期的TEC扰动变化情况对电离层的研究至关重要.本文以2015年3月特大磁暴为研究对象,利用包括北斗系统在内的全球卫星导航系统(GNSS)TEC数据和中国区域的电离层测高仪foF2数据,对此次电离层磁暴的扰动特性进行研究并讨论其可能的物理机制.

The ionospheric electron content(TEC)is greatly affected by solar activity.When the magnetic storm occurs,the TEC changes vary widely in the world.It is very important to study the variation of TEC perturbation in this period for the study of the ionosphere.According to the inverse relationship between the ionospheric delay of the GNSS signal and the square of the signal frequency,the total electron content TEC change on the signal propagation path can be obtained.Without considering the absolute value of the TEC,the high-precision relative TEC can be obtained by using the carrier phase L4 combination,which is used to detect ionospheric disturbances.In this paper,the disturbance characteristics of the giant magnetospheric storm in March 2015 are studied by using GNSS TEC data including Beidou system and foF2 data of ionospheric altimeter in China,and its possible physical mechanism is discussed.