一次强磁暴期间全球电离层扰动研究

A study of global ionospheric disturbances during a strong magnetic storm

利用IGS台网观测数据,以总电子含量TEC、TEC的变化率ROT及其标准差ROTI作为表征电离层不规则结构和扰动的特征参量,研究发生在2004年11月上旬的一次强磁暴期间全球电离层扰动的分布以及扰动的传播。分析结果表明,在磁暴急始和初相阶段,全球电离层相对平静,没有显著扰动发生;不规则体和扰动主要发生在磁暴主相极大前后,并且在日落后几小时开始出现,持续到午夜之后。第一个主相极大期间,强扰动和不规则体主要出现在美洲扇区的中低纬度带;第三个主相极大期间,强扰动和不规则体主要出现在亚太扇区的中低纬度带。

Global ionospheric TEC disturbances and their propagation during a strong magnetic storm occurring in November, 2004 were investigated in this paper by using observation data of IGS network. In this study TEC and its variation rate ROT as well as the ROT＇s standard deviation ROTI were considered as characteristic parameters distinguishing ionospheric disturbances and irregularities. Results showed that the ionosphere was relatively quiet and there was no remarkable disturbance in the global at the SSC of the storm and its initial phase. The ionospheric irregularities and disturbances mainly occurred around the main phase of the storm and during several hours after local sunset and lasted up to the midnight. Around the maximum of the first main phase of the storm, the ionospheric irregularities and disturbances mainly distributed in the region of mid-low latitudes at the American sector where the local time is at night. And around the maximum of the third main phase of the storm, the ionospheric irregularities and disturbances mainly distributed in the region of mid-low latitudes at the Asian-Pacific sector where the local time is at night.