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Observational Evidence and Formation Mechanism of Low-Density Cells in the Upper Thermosphere on September 8, 2017
Yuan, Liangliang1,2,3; Jin, Shuanggen1,2,4
2021-02-01
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
ISSN2169-9380
Volume126Issue:2Pages:15
AbstractThe low-density cell structure in the high-latitude thermosphere is referred to as the density depletion with respect to the adjacent area. Based on Gravity Recovery and Climate Experiment (GRACE) accelerometer data during the September 2017 geomagnetic storms, the thermospheric mass density at about 350 km are estimated and further investigated especially in the high-latitude regions. At least two kinds of low-density cells over the Southern Hemisphere (SH) are observed along the GRACE orbit. To understand the low-density cell structures over the SH observed by GRACE, we investigate the underlying physical mechanism based on thermosphere-ionosphere numerical simulations using Thermosphere-Ionosphere Electrodynamic General Circulation Model and Global Ionosphere Thermosphere Model. According to the simulation results, the formation mechanism of the low-density cell is attributed to the storm-time vertical advection and horizontal velocity divergence driven by the auroral ion convection. The critical height of observable low-density cells is shown to be not less than 350 km. The meridional spatial scale of observed low-density cells over the SH are approximately or slightly larger than 1,500 km. Three low-density cells, including two in the dawn sector and one in the night sector were observed about 1 hour after the direction of interplanetary magnetic field By component reversed. The occurrence of thermospheric low-density structure is essential to be included in the empirical model during geomagnetic storm time.
Funding OrganizationNational Natural Science Foundation of China-German Science Foundation (NSFC-DFG) ; National Natural Science Foundation of China-German Science Foundation (NSFC-DFG) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Jiangsu Province Distinguished Professor Project ; Jiangsu Province Distinguished Professor Project ; Shanghai Leading Talent Project ; Shanghai Leading Talent Project ; National Natural Science Foundation of China-German Science Foundation (NSFC-DFG) ; National Natural Science Foundation of China-German Science Foundation (NSFC-DFG) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Jiangsu Province Distinguished Professor Project ; Jiangsu Province Distinguished Professor Project ; Shanghai Leading Talent Project ; Shanghai Leading Talent Project ; National Natural Science Foundation of China-German Science Foundation (NSFC-DFG) ; National Natural Science Foundation of China-German Science Foundation (NSFC-DFG) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Jiangsu Province Distinguished Professor Project ; Jiangsu Province Distinguished Professor Project ; Shanghai Leading Talent Project ; Shanghai Leading Talent Project ; National Natural Science Foundation of China-German Science Foundation (NSFC-DFG) ; National Natural Science Foundation of China-German Science Foundation (NSFC-DFG) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Jiangsu Province Distinguished Professor Project ; Jiangsu Province Distinguished Professor Project ; Shanghai Leading Talent Project ; Shanghai Leading Talent Project
DOI10.1029/2020JA028915
Language英语
Funding ProjectNational Natural Science Foundation of China-German Science Foundation (NSFC-DFG)[41761134092] ; National Natural Science Foundation of China (NSFC)[12073012] ; Jiangsu Province Distinguished Professor Project[R2018T20] ; Shanghai Leading Talent Project[E056061]
Funding OrganizationNational Natural Science Foundation of China-German Science Foundation (NSFC-DFG) ; National Natural Science Foundation of China-German Science Foundation (NSFC-DFG) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Jiangsu Province Distinguished Professor Project ; Jiangsu Province Distinguished Professor Project ; Shanghai Leading Talent Project ; Shanghai Leading Talent Project ; National Natural Science Foundation of China-German Science Foundation (NSFC-DFG) ; National Natural Science Foundation of China-German Science Foundation (NSFC-DFG) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Jiangsu Province Distinguished Professor Project ; Jiangsu Province Distinguished Professor Project ; Shanghai Leading Talent Project ; Shanghai Leading Talent Project ; National Natural Science Foundation of China-German Science Foundation (NSFC-DFG) ; National Natural Science Foundation of China-German Science Foundation (NSFC-DFG) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Jiangsu Province Distinguished Professor Project ; Jiangsu Province Distinguished Professor Project ; Shanghai Leading Talent Project ; Shanghai Leading Talent Project ; National Natural Science Foundation of China-German Science Foundation (NSFC-DFG) ; National Natural Science Foundation of China-German Science Foundation (NSFC-DFG) ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; Jiangsu Province Distinguished Professor Project ; Jiangsu Province Distinguished Professor Project ; Shanghai Leading Talent Project ; Shanghai Leading Talent Project
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000627265100099
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/78560
Collection中国科学院国家天文台
Corresponding AuthorJin, Shuanggen
Affiliation1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai, Peoples R China
2.Univ Chinese Acad Sci, Beijing, Peoples R China
3.German Aerosp Ctr, Inst Solar Terr Phys, Neustrelitz, Germany
4.Nanjing Univ Informat Sci & Technol, Sch Remote Sensing & Geomat Engn, Nanjing, Peoples R China
Recommended Citation
GB/T 7714
Yuan, Liangliang,Jin, Shuanggen. Observational Evidence and Formation Mechanism of Low-Density Cells in the Upper Thermosphere on September 8, 2017[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2021,126(2):15.
APA Yuan, Liangliang,&Jin, Shuanggen.(2021).Observational Evidence and Formation Mechanism of Low-Density Cells in the Upper Thermosphere on September 8, 2017.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,126(2),15.
MLA Yuan, Liangliang,et al."Observational Evidence and Formation Mechanism of Low-Density Cells in the Upper Thermosphere on September 8, 2017".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 126.2(2021):15.
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