TIEGCM与IRI在中国垂测站的预测性能比较

TIEGCM（Thermosphere-Ionosphere-Electrodynamics General Circulation Model）是NCAR/HAO（The High Altitude Observatory at the National Center for Atmospheric Research）开发的一个三维时变全球尺度电离层-热层耦合数值模式.我们将该模式的输出参数h_mF₂与经验模式国际参考电离层（International Reference Ionosphere，IRI）-2016的结果以及中国地区12个电离层测高仪的h_mF₂观测数据进行了对比，给出了TIEGCM模式在地磁活动平静条件下中国区域不同季节的预测性能分析.总体来看，TIEGCM模式在所有观测站都表现良好，一定程度上能很好地进行中国区域电离层h_mF₂参量研究.且TIEGCM模拟电离层变化的性能比IRI要高25%左右，能在一定程度上进行电离层半年异常和赤道异常模拟.但无论是与IRI模型还是与观测相比，TIEGCM模式均存在一定的误差.并且误差在低纬地区以及日出日落时段波动较大，这些结果为我们以后进行潜在的模式精度控制提供了理论依据.

Prediction performance comparison between TIEGCM and IRI over China ionosonde stations

The thermosphere-ionosphere-electrodynamics general circulation model (TIEGCM) is a three-dimensional,time-dependent models of the coupled thermosphere/ionosphere system,which is developed by the High Altitude Observatory at the National Center for Atmospheric Research (NCAR/HAO).By comparing the height of the peak electron density of the F2-layer(hmF2) variation derived from TIEGCM with the output of IRI-2016(international reference ionosphere)model and the hmF2data collected from 12 digital ionosonde measurements in China,we analyze the forecast performance of TIEGCM in quiet geomagnetic activity of different seasons over China region.Results show that TIEGCM performed well in all ionosonde stations,and can be applied in certain ionospheric hmF2 parameter researches in China.The ability of TIEGCM to simulate ionospheric changes is about 25％ higher than IRI.To some extent,it can simulate ionosphere semi-annual anomaly and equatorial anomaly.Either compared with IRI or data observed,there is a certain deviation in TIEGCM.The deviation in low latitude region fluctuates greatly,and the same during sunrise and sunset,which can provide a theoretical reference for our potential modelcorrection.