Ionospheric response to solar extreme ultraviolet radiation variations: comparison based on CTIPe model simulations and satellite measurements
Ionospheric response to solar extreme ultraviolet radiation variations: comparison based on CTIPe model simulations and satellite measurements
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DOI：
10.5194/angeo-39-341-2021
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发表时间：
2021-04
影响因子：
1.9
通讯作者：
Rajesh Vaishnav;Erik Schmölter;C. Jacobi;J. Berdermann;M. Codrescu
中科院分区：
文献类型：
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作者：
Rajesh Vaishnav;Erik Schmölter;C. Jacobi;J. Berdermann;M. Codrescu
利用IGS提供的电离层总电子含量（TEC）和CTIPe模型模拟的TEC，研究了2011 - 2013年电离层对太阳辐射的延迟响应及其变化趋势。对低纬和中纬TEC在15 E上的响应的分析表明，南半球的TEC观测值与太阳射电通量指数F10. 7的相关性比北方半球好。因此，观察到显著的半球不对称性。电离层延迟估计使用模型模拟的TEC是在很好的协议延迟估计观测TEC对太阳动力学天文台（SDO）的极紫外（EUV）的变化实验（EVE）测量的通量。观测（建模）TEC的平均延迟为17（16）h。计算的平均延迟观测和建模TEC是1和2小时以上，在南半球相比，北方半球。此外，观测到的TEC与模拟TEC使用SOLAR 2000和EUVAC通量模型CTIPe在北方和南半球的网格点。分析表明，使用SOLAR 2000通量模型模拟的TEC高估了观测到的TEC，而使用EUVAC通量模型时并非如此。
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.