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New Modes and Mechanisms of Long-Term Ionospheric TEC Variations From Global Ionosphere Maps
Calabia, Andres1,2; Jin, Shuanggen1,2,3
2020-06-01
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
ISSN2169-9380
Volume125Issue:6Pages:16
AbstractThe ionosphere is very active and complex due to photo-ionization from the solar activity, while traditional empirical models can only give a rough description of its actual variations. Nowadays, global ionosphere maps (GIMs) derived from denser Global Navigation Satellite Systems (GNSS) world-tracking data provide an excellent total electron content (TEC) data set for global ionospheric research and modeling. In this paper, long-tern variations of 16-year (2003-2018) TEC time series from GIMs are investigated by using the principal mode analysis (PCA) technique. We analyze the resulting modes in the time-spectral domain and parameterize the main contributions in terms of solar and magnetospheric forcing, local solar time (LST), and annual variations. The results show that the TEC variability is strongly dependent on the geographical location of the Earth's magnetic field, and the Earth's diurnal rotation modulates its spatial patterns of variability. The latitudinal asymmetry in the global distribution of TEC variations is due to the effects caused by the irregular shape of the Earth's magnetic field along with its diurnal rotation. The analyses of residuals show that periodicities are correlated to the solar wind speed and magnetospheric forcing, especially those located near the southern dip pole at the night side. Furthermore, we found a TEC anomaly at about 15 degrees from the South magnetic dip at the night side, more prominent around 52 degrees S 155 degrees E.
Keywordtotal electron content global ionosphere maps principal component analysis
Funding OrganizationNational Natural Science Foundation of China-German Science Foundation (NSFC-DFG) Project ; National Natural Science Foundation of China-German Science Foundation (NSFC-DFG) Project ; Startup Foundation for Introducing Talent of NUIST ; Startup Foundation for Introducing Talent of NUIST ; Talent Start-Up Funding project of NUIST ; Talent Start-Up Funding project of NUIST ; National Natural Science Foundation of China-German Science Foundation (NSFC-DFG) Project ; National Natural Science Foundation of China-German Science Foundation (NSFC-DFG) Project ; Startup Foundation for Introducing Talent of NUIST ; Startup Foundation for Introducing Talent of NUIST ; Talent Start-Up Funding project of NUIST ; Talent Start-Up Funding project of NUIST ; National Natural Science Foundation of China-German Science Foundation (NSFC-DFG) Project ; National Natural Science Foundation of China-German Science Foundation (NSFC-DFG) Project ; Startup Foundation for Introducing Talent of NUIST ; Startup Foundation for Introducing Talent of NUIST ; Talent Start-Up Funding project of NUIST ; Talent Start-Up Funding project of NUIST ; National Natural Science Foundation of China-German Science Foundation (NSFC-DFG) Project ; National Natural Science Foundation of China-German Science Foundation (NSFC-DFG) Project ; Startup Foundation for Introducing Talent of NUIST ; Startup Foundation for Introducing Talent of NUIST ; Talent Start-Up Funding project of NUIST ; Talent Start-Up Funding project of NUIST
DOI10.1029/2019JA027703
Language英语
Funding ProjectNational Natural Science Foundation of China-German Science Foundation (NSFC-DFG) Project[41761134092] ; Startup Foundation for Introducing Talent of NUIST[2243141801036] ; Talent Start-Up Funding project of NUIST[1411041901010]
Funding OrganizationNational Natural Science Foundation of China-German Science Foundation (NSFC-DFG) Project ; National Natural Science Foundation of China-German Science Foundation (NSFC-DFG) Project ; Startup Foundation for Introducing Talent of NUIST ; Startup Foundation for Introducing Talent of NUIST ; Talent Start-Up Funding project of NUIST ; Talent Start-Up Funding project of NUIST ; National Natural Science Foundation of China-German Science Foundation (NSFC-DFG) Project ; National Natural Science Foundation of China-German Science Foundation (NSFC-DFG) Project ; Startup Foundation for Introducing Talent of NUIST ; Startup Foundation for Introducing Talent of NUIST ; Talent Start-Up Funding project of NUIST ; Talent Start-Up Funding project of NUIST ; National Natural Science Foundation of China-German Science Foundation (NSFC-DFG) Project ; National Natural Science Foundation of China-German Science Foundation (NSFC-DFG) Project ; Startup Foundation for Introducing Talent of NUIST ; Startup Foundation for Introducing Talent of NUIST ; Talent Start-Up Funding project of NUIST ; Talent Start-Up Funding project of NUIST ; National Natural Science Foundation of China-German Science Foundation (NSFC-DFG) Project ; National Natural Science Foundation of China-German Science Foundation (NSFC-DFG) Project ; Startup Foundation for Introducing Talent of NUIST ; Startup Foundation for Introducing Talent of NUIST ; Talent Start-Up Funding project of NUIST ; Talent Start-Up Funding project of NUIST
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000545696000005
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/82837
Collection中国科学院国家天文台
Corresponding AuthorJin, Shuanggen
Affiliation1.Nanjing Univ Informat Sci & Technol, Sch Remote Sensing & Geomat Engn, Nanjing, Peoples R China
2.Jiangsu Engn Ctr Collaborat Nav Positioning & Sma, Nanjing, Peoples R China
3.Chinese Acad Sci, Shanghai Astron Observ, Shanghai, Peoples R China
Recommended Citation
GB/T 7714
Calabia, Andres,Jin, Shuanggen. New Modes and Mechanisms of Long-Term Ionospheric TEC Variations From Global Ionosphere Maps[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2020,125(6):16.
APA Calabia, Andres,&Jin, Shuanggen.(2020).New Modes and Mechanisms of Long-Term Ionospheric TEC Variations From Global Ionosphere Maps.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,125(6),16.
MLA Calabia, Andres,et al."New Modes and Mechanisms of Long-Term Ionospheric TEC Variations From Global Ionosphere Maps".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 125.6(2020):16.
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