Global ionospheric electron density estimation based on multisource TEC data assimilation
Global ionospheric electron density estimation based on multisource TEC data assimilation
复制标题
基于多源TEC数据同化的全球电离层电子密度估算
DOI：
10.1007/s10291-016-0580-7
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发表时间：
2017
期刊：
影响因子：
4.9
通讯作者：
Zhao Biqiang
中科院分区：
文献类型：
--
作者：
She Chengli;Wan Weixing;Yue Xinan;Xiong Bo;Yu You;Ding Feng;Zhao Biqiang
我们基于 IRI-2012 模型，通过水平方向的球谐函数展开和垂直方向的经验正交函数开发了参数化电离层电子密度模型。然后，将地基 GPS、LEO 无线电掩星（RO）和静磁时段海洋高度计的月度多源总电子含量（TEC）数据同化到模型中，重新分析了月度全球电离层电子密度 TEC 以及 foF2 和 NmF2 等其他关键参数。将重新分析的结果和 IRI-2012 模型结果与 TEC 测量结果、中纬度电离探空站的月中值 foF2 以及来自 CODE 的全球 TEC 地图进行比较。比较表明，重新分析和 IRI 结果与观察结果一致，并且重新分析结果比 IRI 模型表现更好。此外，重新分析的结果也与从 COSMIC RO 观测中检索到的 HmF2、NmF2 和 TEC 图一致。总之，我们的方法可以使用同化到我们的模型中的多源 TEC 数据重新分析全局 TEC 和电子密度，并提高 IRI 模型的性能。
We developed a parameterized ionospheric electron density model based on the IRI-2012 model by spherical harmonic expansions in the horizontal and empirical orthogonal functions in the vertical. Then, after assimilating the monthly multisource total electron content (TEC) data from ground-based GPS, LEO radio occultation (RO), and the oceanic altimeter during magnetically quiet time into the model, we reanalyzed the monthly global ionospheric electron density TEC and other key parameters such as foF2 and NmF2. Both the reanalyzed and IRI-2012 model results were compared to the TEC measurements, the monthly median foF2 in a middle-latitude ionosonde station, and the global TEC map from CODE. The comparisons showed that both the reanalyzed and IRI results are consistent with those observations and the reanalyzed results perform better than the IRI model. Furthermore, the reanalyzed results are also consistent with the retrieved maps of HmF2, NmF2, and TEC from COSMIC RO observations. In summary, our method can reanalyze the global TEC and electron density using multisource TEC data assimilated into our model and improve the performance of IRI model.