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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Data assimilation retrieval of electron density profiles from radio occultation measurements
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Data assimilation retrieval of electron density profiles from radio occultation measurements

机译：数据同化检索的电子密度从无线电掩星观测资料

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摘要

In this paper, the Kalman filter is used to retrieve the electron density profile along the tangent points by assimilating the slant total electron content data observed during a radio occultation (RO) event into an empirical background model. The RO data observed by COSMIC satellites on day of year 266 in 2009 are selected to do both the simulation work and the real data retrieval test. The results show that the data assimilation technique can improve the electron density retrieval in comparison with the Abel inversion. It is less influenced by the ionospheric inhomogeneity than the Abel method. Some pseudo-large-scale features made by the Abel retrieval, such as the plasma cave underneath the equatorial ionization anomaly region and the three peaks along the latitude direction in the E layer, disappear in the data assimilation retrieval results. Independent validation by ground-based ionosonde observations confirms the improvement of data assimilation retrieval below the F_2 peak. In addition, some potential research on RO data assimilation is also discussed.
机译：在本文中,使用卡尔曼滤波器检索的电子密度剖面切线点通过同化倾斜电子期间观察到的数据广播的内容掩星(RO)事件变成一个经验背景模型。266年2009年卫星的一天模拟工作和选择真正的数据检索的测试。数据同化技术可以提高电子密度检索与比较亚伯反演。电离层不均匀性比伯的方法。一些pseudo-large-scale特性由亚伯检索,如等离子体下面的洞穴里赤道电离和异常区域三个峰值沿纬度方向的E层,数据同化消失检索结果。地面ionosonde观测证实了下面的数据同化检索改进₂峰值。RO数据同化研究也进行了讨论。

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