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Regional 3-D ionospheric electron density specification on the basis of data assimilation of ground-based GNSS and radio occultation data
Ercha Aa; Siqing Liu; Wengeng Huang; Liqin Shi; Jiancun Gong; Yanhong Chen; Hua Shen; Jianyong Li
Department空间环境部
Source Publicationspace weather-the international journal of research and applications
2016
Volume14Issue:6Pages:433-448
ISSN1542-7390
Language英语
KeywordIonosphere Data Assimilation Gnss Ro Tec 3dvar
AbstractIn this paper, a regional 3-D ionospheric electron density specification over China and adjacent areas (70°E–140°E in longitude, 15°N–55°N in latitude, and 100–900 km in altitude) is developed on the basis of data assimilation technique. The International Reference Ionosphere (IRI) is used as a background model, and a three-dimensional variational technique is used to assimilate both the ground-based Global Navigation Satellite System (GNSS) observations from the Crustal Movement Observation Network of China (CMONOC) and International GNSS Service (IGS) and the ionospheric radio occultation (RO) data from FORMOSAT-3/COSMIC (F3/C) satellites. The regional 3-D gridded ionospheric electron densities can be generated with temporal resolution of 5 min in universal time, horizontal resolution of 2° × 2° in latitude and longitude, and vertical resolution of 20 km between 100 and 500 km and 50 km between 500 and 900 km. The data assimilation results are validated through extensive comparison with several sources of electron density information, including (1) ionospheric total electron content (TEC); (2) Abel-retrieved F3/C electron density profiles (EDPs); (3) ionosonde foF2 and bottomside EDPs; and (4) the Utah State University Global Assimilation of Ionospheric Measurements (USU-GAIM) under both geomagnetic quiet and disturbed conditions. The validation results show that the data assimilation procedure pushes the climatological IRI model toward the observation, and a general accuracy improvement of 15–30% can be expected. Thecomparisons also indicate that the data assimilation results are more close to the Center for Orbit Determination of Europe (CODE) TEC and Madrigal TEC products than USU-GAIM. These initial results might demonstrate the effectiveness of the data assimilation technique in improving specification of local ionospheric morphology.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/5526
Collection空间环境部
Recommended Citation
GB/T 7714
Ercha Aa,Siqing Liu,Wengeng Huang,et al. Regional 3-D ionospheric electron density specification on the basis of data assimilation of ground-based GNSS and radio occultation data[J]. space weather-the international journal of research and applications,2016,14(6):433-448.
APA Ercha Aa.,Siqing Liu.,Wengeng Huang.,Liqin Shi.,Jiancun Gong.,...&Jianyong Li.(2016).Regional 3-D ionospheric electron density specification on the basis of data assimilation of ground-based GNSS and radio occultation data.space weather-the international journal of research and applications,14(6),433-448.
MLA Ercha Aa,et al."Regional 3-D ionospheric electron density specification on the basis of data assimilation of ground-based GNSS and radio occultation data".space weather-the international journal of research and applications 14.6(2016):433-448.
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