电离层模型IRI-2016的hmF2参数的性能评估

Evaluation the Performance of hmF2 Parameter Derived from Ionosphere Model IRI-2016

最新版的国际电离层参考模型(international reference ionosphere,IRI-2016)中新增了两种计算电离层F2层峰值高度(hmF2)的模型,即AMTB模型和Shubin模型。本文使用2008年和2014年位于磁赤道附近的Jicamarca站垂测仪实测数据对IRI-2016中原有hmF2模型(CCIR模型)和两种新增模型在不同太阳活动水平条件下的性能进行验证评估。结果发现,在太阳活动高年和低年,IRI-2016提供的3种hmF2模型的预测值均存在明显的季节性变化和昼夜变化。在太阳活动低年,3种模型在春秋季的表现要优于夏季和冬季,而在太阳活动高年,3种模型在夏季表现最好。同时,3种模型的hmF2预测值在本地时间(local time, LT)白天0700~1900 LT均普遍高于实测值,CCIR模型和Shubin模型预测值在夜间(2000~0600 LT)大部分低于实测值。综合考虑,在磁赤道地区,我们推荐使用Shubin模型来对电离层峰值高度进行估计。

The latest version of international reference ionosphere model(IRI-2016)provides two new options to calculate ionospheric F2 layer peak height(hmF2),that is,AMTB model and Shubin model.HmF2 data recorded in 2008 and 2014 by ionosonde station in Jicamarca which is located near the geomagnetic equator,are used to evaluate the performance of previously existed hmF2 model(CCIR model)and two newly-added models under different solar activity conditions.The results show that three hmF2 models provided by IRI-2016 have distinct seasonal and diurnal variations both in high and low solar activity years.In low solar activity year,the performances of three models are better in equinox than summer and winter.While in high solar activity year,three models perform best in summer.Meanwhile,hmF2 predictions calculated by three IRI hmF2 models are higher than measured values during localday time 0700~1900 LT.CCIR model and Shubin model predictions are mainly lower than measured values during night time(2000~0600 LT).Through comprehensive consideration,we recommend using Shubin model to predict hmF2 over geomagnetic equator region.