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An observational and theoretical study of the longitudinal variation in neutral temperature induced by aurora heating in the lower thermosphere
Xu, Jiyao1; Smith, A. K.2; Wang, Wenbin3; Jiang, Guoying1; Yuan, Wei1; Gao, Hong1; Yue, Jia4; Funke, B.5; Lopez-Puertas, M.5; Russell, James M., III4; 北京8701信箱
Department空间天气学国家重点实验室
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2013-11-01
Volume118Issue:11Pages:7410-7425
ISSN2169-9402
Language英语
KeywordAurora Heating Lower Thermosphere
AbstractIn this paper, observations by thermosphere, ionosphere, mesosphere energetics and dynamics/Sounding of the Atmosphere using Broadband Emission Radiometry from 2002 to 2012 and by Envisat/Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) from 2008 to 2009 are used to study the longitudinal structure of temperature in the lower thermosphere. In order to remove the longitudinal structure induced by tides, diurnally averaged SABER temperatures are used. For MIPAS data, we use averaged temperatures between day and night. The satellite observations show that there are strong longitudinal variations in temperature in the high-latitude lower thermosphere that persist over all seasons. The peak of the diurnally averaged temperature in the lower thermosphere always occurs around the auroral zone. A clear asymmetry between the two hemispheres in the longitudinal temperature structure is observed, being more pronounced in the Southern than in the Northern Hemisphere. In both hemispheres, the longitudinal variation is dominated by the first harmonic in longitude. The total radiative cooling observed by SABER has a structure in longitude that is similar to that of temperature. Modeling simulations using the Thermosphere-Ionosphere-Electrodynamics General Circulation Model reproduce similar features of the longitudinal variations of temperature in the lower thermosphere. Comparison of two model runs with and without auroral heating confirms that auroral heating causes the observed longitudinal variations. The multiyear averaged vertical structures of temperature observed by the two satellite instruments indicate that the impact of auroral heating on the thermodynamics of the neutral atmosphere can penetrate down to about 105 km.; In this paper, observations by thermosphere, ionosphere, mesosphere energetics and dynamics/Sounding of the Atmosphere using Broadband Emission Radiometry from 2002 to 2012 and by Envisat/Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) from 2008 to 2009 are used to study the longitudinal structure of temperature in the lower thermosphere. In order to remove the longitudinal structure induced by tides, diurnally averaged SABER temperatures are used. For MIPAS data, we use averaged temperatures between day and night. The satellite observations show that there are strong longitudinal variations in temperature in the high-latitude lower thermosphere that persist over all seasons. The peak of the diurnally averaged temperature in the lower thermosphere always occurs around the auroral zone. A clear asymmetry between the two hemispheres in the longitudinal temperature structure is observed, being more pronounced in the Southern than in the Northern Hemisphere. In both hemispheres, the longitudinal variation is dominated by the first harmonic in longitude. The total radiative cooling observed by SABER has a structure in longitude that is similar to that of temperature. Modeling simulations using the Thermosphere-Ionosphere-Electrodynamics General Circulation Model reproduce similar features of the longitudinal variations of temperature in the lower thermosphere. Comparison of two model runs with and without auroral heating confirms that auroral heating causes the observed longitudinal variations. The multiyear averaged vertical structures of temperature observed by the two satellite instruments indicate that the impact of auroral heating on the thermodynamics of the neutral atmosphere can penetrate down to about 105km.
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/1520
Collection空间科学部
Corresponding Author北京8701信箱
Affiliation1.Chinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing 100190, Peoples R China
2.Natl Ctr Atmospher Res, Div Atmospher Chem, Boulder, CO 80307 USA
3.Natl Ctr Atmospher Res, High Altitude Observ, Boulder, CO 80307 USA
4.Hampton Univ, Hampton, VA 23668 USA
5.CSIC, Inst Astrofis Andalucia, Granada, Spain
Recommended Citation
GB/T 7714
Xu, Jiyao,Smith, A. K.,Wang, Wenbin,et al. An observational and theoretical study of the longitudinal variation in neutral temperature induced by aurora heating in the lower thermosphere[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2013,118(11):7410-7425.
APA Xu, Jiyao.,Smith, A. K..,Wang, Wenbin.,Jiang, Guoying.,Yuan, Wei.,...&北京8701信箱.(2013).An observational and theoretical study of the longitudinal variation in neutral temperature induced by aurora heating in the lower thermosphere.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,118(11),7410-7425.
MLA Xu, Jiyao,et al."An observational and theoretical study of the longitudinal variation in neutral temperature induced by aurora heating in the lower thermosphere".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 118.11(2013):7410-7425.
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