IF 2.6 2区 地球科学 Q2 ASTRONOMY & ASTROPHYSICS
Binyi Huang, Peng Chen, Yibin Yao, Rong Wang, Yuchen Zhang
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引用次数: 0

摘要

风云三号 E 卫星(FY-3E)首次采用了全球导航卫星系统掩星探测仪 II(GNOS-II)。掩星法对电离层探测很有效,但由于仪器和方法不同,FY-3E 和其他技术之间的数据差异不可避免。根据其他技术评估 GNOS-II 的性能势在必行。我们从 FY-3E 的电子密度剖面图中提取电离层参数--F2 层峰高(hmF2)、F2 层临界频率(foF2)和垂直总电子含量(VTEC)。我们利用电离层探测仪、全球电离层地图(GIMs)、卫星测高(SA)以及 FY-3D 和 COSMIC-2 分析 FY-3E 的性能。此外,我们还使用国际参考电离层(IRI-2020)对 VTEC 进行归一化处理,消除因高度差异造成的系统偏差。结果表明,FY-3E 的 foF2 与电离层探测仪的一致性较高,而 hmF2 的差异较大。不过,FY-3E、FY-3D 和 COSMIC-2 的 foF2 和 hmF2 数据质量相当。在春分和白天,FY-3E 和 GIMs 的 TEC 差异较大。观测到的 TEC 偏差很大,特别是在白天受赤道电离异常(EIA)影响的低纬度地区,在 EIA 波峰处被低估,在 EIA 波谷处和±40°地磁纬度附近被高估,与 SA 相比也观察到这种现象。FY-3D 和 COSMIC-2 显示出类似的模式,但与 FY-3D 相比,FY-3E 与 GIMs 和 SA 的一致性更好。与 FY-3D 和 FY-3E 相比,COSMIC-2 高估的剖面较少。此外,FY-3E 在观测 EIA 区域电离层结构方面表现不佳,但在威德尔海异常(WSA)区域表现良好,与 FY-3E 相似。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Validation of Ionospheric Parameters From Electron Density Profiles of FY-3E Satellite Using Ionosonde, GIMs, Satellite Altimetry and Other Occultations

The FengYun-3E satellite (FY-3E) is the first to feature the GNSS Occultation Sounder II (GNOS-II). Occultation is effective for ionosphere detection, but data variations between FY-3E and other techniques are inevitable due to differing instruments and methodologies. Evaluating the GNOS-II performance against other techniques is imperative. We extract ionospheric parameters—the F2 layer peak height (hmF2), F2 layer critical frequency (foF2), and Vertical Total Electron Content (VTEC)—from FY-3E's electron density profile. We use ionosonde, Global Ionospheric Maps (GIMs), and Satellite Altimetry (SA), along with FY-3D and COSMIC-2 to analyze FY-3E's performance. Additionally, we use the International Reference Ionosphere (IRI-2020) to normalize VTEC, eliminating systematic biases due to altitude differences. Results show that FY-3E's foF2 has high consistency with ionosonde, while hmF2 shows larger differences. However, both foF2 and hmF2 from FY-3E, FY-3D, and COSMIC-2 have comparable data quality. TEC differences between FY-3E and GIMs are greater during equinoxes and in the daytime. Significant TEC deviations are observed, particularly in low-latitude region affected by the Equatorial Ionization Anomaly (EIA) during the daytime, with underestimation at EIA crests and overestimation at EIA troughs and around ±40° geomagnetic latitude, a phenomenon also observed when compared to SA. FY-3D and COSMIC-2 exhibit similar patterns, but FY-3E shows better consistency with GIMs and SA compared to FY-3D. Compared to FY-3D and FY-3E, COSMIC-2 has fewer overestimated profiles. Furthermore, FY-3E performs poorly in observing ionospheric structure in the EIA region but performs well in the Weddell Sea Anomaly (WSA) region, similar to FY-3E.

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来源期刊
Journal of Geophysical Research: Space Physics
Journal of Geophysical Research: Space Physics Earth and Planetary Sciences-Geophysics
CiteScore
5.30
自引率
35.70%
发文量
570
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