Sounding of sporadic E layers from China Seismo-Electromagnetic Satellite (CSES) radio occultation and comparing with ionosonde measurements

IF 1.7 4区地球科学 Q3 ASTRONOMY & ASTROPHYSICS

Annales Geophysicae Pub Date : 2022-07-07 DOI:10.5194/angeo-40-463-2022

Chengkun Gan, Jiayu Hu, Xiaomin Luo, Chao Xiong, S. Gu

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引用次数: 2

Abstract

Abstract. GNSS radio occultation (RO) plays an important role in ionospheric electron density inversion and sounding of sporadic E layers. As China's first electromagnetic satellite, China Seismo-Electromagnetic Satellite (CSES) has collected the RO data from both GPS and BDS-2 satellites since March 2018. In this study, we extracted the signal-to-noise ratio (SNR) data of CSES and calculated the standard deviation of normalized SNR. A new criterion is developed to determine the Es events, that is, when the mean value of the absolute value of the difference between the normalized SNR is greater than 3 times the standard deviation. The statistics show that sporadic E layers have strong seasonal variations with highest occurrence rates in summer season at middle latitudes. It is also found that the occurrence height of Es is mainly located at 90–110 km, and the period 14:00–20:00 LT is the high incidence period of Es. In addition, the geometric altitudes of a sporadic E layer detected in CSES radio occultation profiles and the virtual heights of a sporadic E layer obtained by the Wuhan Zuoling station (ZLT) ionosonde show three different space-time matching criteria. Our results reveal that there is a good agreement between both parameters which is reflected in the significant correlation.

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中国地震电磁卫星(CSES)无线电掩星探测零星E层及其与电离空测量的比较

摘要GNSS射电掩星(RO)在离子层电子密度反演和零星E层探测中起着重要作用。作为中国第一颗电磁卫星，中国地震电磁卫星(CSES)自2018年3月以来一直收集GPS和bds -2卫星的RO数据。在本研究中，我们提取了CSES的信噪比数据，并计算了归一化信噪比的标准差。提出了确定Es事件的新准则，即当归一化信噪比之差的绝对值的平均值大于标准差的3倍时。统计表明，散发E层具有强烈的季节变化，在中纬度地区夏季发生率最高。Es的发生高度主要集中在90 ~ 110 km, 14:00 ~ 20:00 LT是Es的高发期。此外，cssr掩星剖面探测到的散发性E层几何高度与武汉左陵站(ZLT)电离空探空仪获得的散发性E层虚高呈现出三种不同的时空匹配准则。我们的结果表明，这两个参数之间有很好的一致性，这体现在显著的相关性上。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Annales Geophysicae 地学-地球科学综合

CiteScore

4.30

自引率

0.00%

发文量

审稿时长

2 months

期刊介绍： Annales Geophysicae (ANGEO) is a not-for-profit international multi- and inter-disciplinary scientific open-access journal in the field of solar–terrestrial and planetary sciences. ANGEO publishes original articles and short communications (letters) on research of the Sun–Earth system, including the science of space weather, solar–terrestrial plasma physics, the Earth''s ionosphere and atmosphere, the magnetosphere, and the study of planets and planetary systems, the interaction between the different spheres of a planet, and the interaction across the planetary system. Topics range from space weathering, planetary magnetic field, and planetary interior and surface dynamics to the formation and evolution of planetary systems.