The ionospheric total electron content (TEC) provided by the International GNSS Service (IGS) and the TEC simulated by the Coupled Thermosphere Ionosphere Plasmasphere Electrodynamics (CTIPe) model have been used to investigate the delayed ionospheric response against solar flux and its trend during the years 2011 to 2013. The analysis of the distinct low-latitude and midlatitude TEC response over 15^∘ E shows a better correlation of observed TEC and the solar radio flux index F10.7 in the Southern Hemisphere compared to the Northern Hemisphere. Thus, a significant hemispheric asymmetry is observed.The ionospheric delay estimated using model-simulated TEC is in good agreement with the delay estimated for observed TEC against the flux measured by the Solar Dynamics Observatory (SDO) extreme ultraviolet (EUV) Variability Experiment (EVE). The average delay for the observed (modeled) TEC is 17(16) h. The average delay calculated for observed and modeled TEC is 1 and 2 h longer in the Southern Hemisphere compared to the Northern Hemisphere.Furthermore, the observed TEC is compared with the modeled TEC simulated using the SOLAR2000 and EUVAC flux models within CTIPe over northern and southern hemispheric grid points. The analysis suggests that TEC simulated using the SOLAR2000 flux model overestimates the observed TEC, which is not the case when using the EUVAC flux model.

中文翻译：

---

电离层对太阳极端紫外线辐射变化的响应：基于CTIPe模型仿真和卫星测量的比较

国际GNSS服务（IGS）提供的电离层总电子含量（TEC）和耦合热层电离层等离子层电动力学（CTIPe）模型模拟​​的TEC已用于研究近年来电离层对太阳通量的延迟响应及其趋势2011至2013年的明显低纬度和经纬度TEC响应的分析15 ^∘ E显示，与北半球相比，南半球观测到的TEC与太阳辐射通量指数F10.7有更好的相关性。因此，观测到了明显的半球不对称性。使用模型模拟的TEC估算的电离层延迟与针对观测到的TEC估算的延迟相对于太阳动力学天文台（SDO）极紫外（EUV）可变性实验（EVE）测得的通量有很好的一致性。 ）。观察到的（建模的）TEC的平均延迟为17（16）h。与北半球相比，南半球观测到的和模拟的TEC的平均延迟分别是北半球的1和2小时，此外，观测到的TEC与在北部和南部CTIPe中使用SOLAR2000和EUVAC通量模型模拟的模拟TEC进行了比较半球网格点。