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The Early Results and Validation of FORMOSAT‐7/COSMIC‐2 Space Weather Products: Global Ionospheric Specification and Ne‐Aided Abel Electron Density Profile
Journal of Geophysical Research: Space Physics ( IF 2.8 ) Pub Date : 2020-10-01 , DOI: 10.1029/2020ja028028
Chi‐Yen Lin, Charles Chien‐Hung Lin, Jann‐Yenq Liu, P. K. Rajesh, Tomoko Matsuo, Min‐Yang Chou, Ho‐Fang Tsai, Wen‐Hao Yeh

The FORMOSAT‐7/COSMIC‐2 (F7/C2) satellite mission was launched on 25 June 2019 with six low‐Earth‐orbit satellites and can provide thousands of daily radio occultation (RO) soundings in the low‐latitude and midlatitude regions. This study shows the preliminary results of space weather data products based on F7/C2 RO sounding: global ionospheric specification (GIS) electron density and Ne‐aided Abel and Abel electron density profiles. GIS is the ionospheric data assimilation product based on the Gauss‐Markov Kalman filter, assimilating the ground‐based Global Positioning System and space‐based F7/C2 RO slant total electron content, providing continuous global three‐dimensional electron density distribution. The Ne‐aided Abel inversion implements four‐dimensional climatological electron density constructed from previous RO observations, which has the advantage of providing altitudinal information on the horizontal gradient to reduce the retrieval error due to the spherical symmetry assumption of the Abel inversion. The comparisons show that climatological structures are consistent with each other above 300 km altitude. Both the Abel electron density profiles and GIS detect electron density variations during a minor geomagnetic storm that occurred within the study period. Moreover, GIS is further capable of reconstructing the variation of equatorial ionization anomaly crests. Detailed validations of all the three products are carried out using manually scaled digisonde NmF2 (hmF2), yielding correlation coefficients of 0.885 (0.885) for both Abel inversions and 0.903 (0.862) for GIS. The results show that both GIS and Ne‐aided Abel are reliable products in studying ionosphere climatology, with the additional advantage of GIS for space weather research and day‐to‐day variations.

中文翻译:

FORMOSAT-7 / COSMIC-2太空气象产品的早期结果和验证:全球电离层规范和Nebeled Abel电子密度分布图

FORMOSAT-7 / COSMIC-2(F7 / C2)卫星任务于2019年6月25日发射,载有6颗低地球轨道卫星,可以在低纬度和中纬度地区提供数千次的每日无线电掩星(RO)探测。这项研究显示了基于F7 / C2 RO测深的空间天气数据产品的初步结果:全球电离层规范(GIS)电子密度以及Nebeled Abel和Abel电子密度分布图。GIS是基于高斯-马尔可夫卡尔曼滤波器的电离层数据同化产品,可吸收基于地面的全球定位系统和基于空间的F7 / C2 RO倾斜总电子含量,从而提供连续的全球三维电子密度分布。Ne-辅助Abel反演实现了根据先前RO观测结果构建的多维气候电子密度,这样做的好处是,由于Abel反演的球对称性假设,在水平梯度上提供了高度信息,以减少检索误差。比较表明,海拔300 km以上的气候结构相互一致。在研究期内发生的小地磁风暴期间,Abel电子密度分布图和GIS均检测到电子密度变化。此外,GIS还能够重建赤道电离异常波峰的变化。所有三种产品的详细验证均使用手动缩放的digisonde进行 比较表明,海拔300 km以上的气候结构相互一致。在研究期内发生的小地磁风暴期间,Abel电子密度分布图和GIS均检测到电子密度变化。此外,GIS还能够重建赤道电离异常波峰的变化。所有三种产品的详细验证均使用手动缩放的digisonde进行 比较表明,海拔300 km以上的气候结构相互一致。在研究期内发生的小地磁风暴期间,Abel电子密度剖面和GIS都可以检测电子密度变化。此外,GIS还能够重建赤道电离异常波峰的变化。所有三种产品的详细验证均使用手动缩放的digisonde进行N m F 2(h m F 2),两个Abel反演的相关系数为0.885(0.885),而GIS的相关系数为0.903(0.862)。结果表明,GIS和Needed Abel都是研究电离层气候学的可靠产品,并且具有GIS在空间天气研究和日常变化方面的其他优势。
更新日期:2020-10-12
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