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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >A feasibility study of the radio occultation electron density retrieval aided by a global ionospheric data assimilation model
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A feasibility study of the radio occultation electron density retrieval aided by a global ionospheric data assimilation model

机译：无线电掩星的可行性研究全球电子密度检索辅助电离层数据同化模型

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摘要

Radio Occultation (RO) has been proven a powerful technique on profiling ionospheric electron density profile. The currently used Abel inversion in RO electron density profile retrieval has degraded performance in regions with large horizontal gradients because of an assumption of spherical symmetry as indicated by many studies. Due to the success of COSMIC/FORMOSAT-3, the Joint U.S.-Taiwan Executive Steering Committee has decided to move forward with a follow-on RO mission (called COSMIC-2/FORMOSAT-7), which implies that the number of RO observations will increase rapidly in the near future. It is thus worthwhile continuing retrieval method improvements. In this study, a global ionospheric data assimilation model is constructed. A series of simulation tasks are conducted to study the feasibility of RO electron density profile retrieval aided by a global ionospheric data assimilation model based on the planned COSMIC-2/FORMOSAT-7 orbits and existing GPS, GLONASS and ground-based Global Navigation Satellite System (GNSS) stations configuration. We find that the data assimilation aided retrieval can significantly improve upon the Abel inversion and offers an optimal electron density profile retrieval approach if sufficient RO and ground GNSS observations are available. The retrieval error is affected by the data quantity, ionospheric variability, and accuracy of the data assimilation background. It is found that ~700 globally distributed occultations per hour are sufficient to get better performance than the Abel inversion with the resolution of 2.5° in latitude, 5° in longitude, and 20 km in altitude in the data assimilation model.
机译：无线电掩星(RO)已经被证明是一个强大的技术分析电离层电子密度剖面。RO电子密度剖面的反演检索性能退化的地区因为一个大的水平梯度假设球对称的许多研究。宇宙/ FORMOSAT-3,美国同台湾联合行政指导委员会决定离开推进后续RO任务(称为COSMIC-2 / FORMOSAT-7),这意味着RO观测的数量将迅速增加在不久的将来。继续检索方法的改进。研究中,一个全球电离层数据同化模型是构造。任务是进行研究的可行性RO电子密度剖面检索辅助的全球电离层数据同化模型的基础在COSMIC-2 / FORMOSAT-7轨道和计划现有的GPS、GLONASS和地面全球导航卫星系统(GNSS)站配置。辅助检索可以显著改进亚伯反演和提供了一个最佳的电子如果足够密度轮廓检索方法罗依和地面GNSS观测是可用的。检索错误数据的影响数量、电离层的变化和准确性数据同化的背景。~ 700全球分布的掩星小时就足以获得更好的性能比伯反演的分辨率2.5°纬度、经度5°,20公里高度的数据同化模型。

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