Global Gridded Ionospheric Electron Density Derivation During 2006–2016 by Assimilating COSMIC TEC and Its Validation
Global Gridded Ionospheric Electron Density Derivation During 2006–2016 by Assimilating COSMIC TEC and Its Validation
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DOI：
10.1029/2022ja030955
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发表时间：
2022-12
期刊：
影响因子：
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通讯作者：
Jianhui He;X. Yue;E. Astafyeva;H. Le;Zhipeng Ren;N. Pedatella;Feng Ding;Yong Wei
中科院分区：
文献类型：
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作者：
Jianhui He;X. Yue;E. Astafyeva;H. Le;Zhipeng Ren;N. Pedatella;Feng Ding;Yong Wei
地球电离层状态的长期准确规范对于空间气象界的科学研究和应用至关重要。在目前的工作中，在2006年至2016年的一个太阳周期期间，获得了全球月平均三维（3-D）电离层电子密度产品。具体而言，通过卡尔曼滤波数据同化算法，将气象、电离层和气候星座观测系统倾斜总电子含量（TEC）同化到经验背景模型中，每月重建一个精确的3-D产品。结果的输出具有纬度2°、经度5°和高度20 km的空间分辨率，以及世界时1小时的时间分辨率。利用全球电离层探测站的F2层临界频率、CHAllenging小卫星有效载荷平面朗缪尔探测器的现场电子密度、马萨诸塞州理工学院的TEC以及重力恢复与气候实验，系统地验证了结果的准确性和可靠性。我们发现，产品符合独立的观察。一些著名的电离层气候模式，包括太阳和季节变化，年度不对称，威德尔海异常和纵波结构，可以很好地说明。这些产品的优势在于其三维和网格化的电子密度以及连续的一个太阳周期时间序列（2006-2016）。研究电离层状态从季节到几十年的时空变化是有用的，也可以作为大气和电离层相关科学研究和应用的背景参数。
The long‐term accurate specification of the Earth's ionospheric states is crucial to scientific research and applications in the space weather community. In the current work, a global monthly mean three‐dimensional (3‐D) ionospheric electron density product has been obtained during one solar cycle from 2006 to 2016. Specifically, an accurate 3‐D product is reconstructed monthly by assimilating the Constellation Observing System for Meteorology, Ionosphere and Climate slant total electron content (TEC) into an empirical background model via the Kalman filter data assimilation algorithm. The outputs of the results have spatial resolutions of 2° in latitude, 5° in longitude, and 20 km in height, and temporal resolution of 1 hr in universal time. The accuracy and reliability of the results are systematically validated by the critical frequency at the F2 layer from global ionosonde stations, the in situ electron density from the CHAllenging Minisatellite Payload Planar Langmuir Probe, the TEC from the Massachusetts Institute of Technology, and Gravity Recovery and Climate Experiment. We found that the products agree well with the independent observations. Some well‐known ionospheric climatological patterns, including the solar and seasonal variation, annual asymmetry, the Weddell Sea Anomaly, and the longitudinal wave structure, can be well illustrated. The advantages of the products are its 3‐D and gridded electron density and continuous one solar cycle time series (2006–2016). It is useful to study the spatial‐temporal variations in ionospheric states from seasons to decades, which can also be used as the background parameters for atmospheric and ionospheric‐related scientific research and applications.