DOI: 10.1002/2014GL062345
论文题名: Hemispheric asymmetry of the structure of dayside auroral oval
作者: Hu Z.-J. ; Ebihara Y. ; Yang H.-G. ; Hu H.-Q. ; Zhang B.-C. ; Ni B. ; Shi R. ; Trondsen T.S.
刊名: Geophysical Research Letters
ISSN: 0094-9466
EISSN: 1944-9197
出版年: 2014
卷: 41, 期: 24 起始页码: 8696
结束页码: 8703
语种: 英语
Scopus关键词: Geophysics
; Comprehensive analysis
; Hemi-spheric asymmetries
; Interplanetary magnetic fields
; Ionospheric conductivity
; Magnetic local time
; Northern Hemispheres
; Seasonal differences
; Southern Hemisphere
; Earth sciences
; asymmetry
; aurora
; conductivity
; ionosphere
; magnetic field
; real time
; satellite data
; seasonal variation
; Arctic and Antarctic
英文摘要: A comprehensive analysis of long-term and multispectral auroral observations made in the Arctic and Antarctica demonstrates that the dayside auroral ovals in two hemispheres are both presented in a two-peak structure, namely, the prenoon 09:00 magnetic local time (MLT) and postnoon 15:00 MLT peaks. The two-peak structures of dayside ovals, however, are asymmetric in the two hemispheres; i.e., the postnoon average auroral intensity is more than the prenoon one in the Northern Hemisphere but less in the Southern Hemisphere. The hemispheric asymmetry cannot be accounted for by the effect of the interplanetary magnetic field By component and the seasonal difference of ionospheric conductivities in the two hemispheres, which were used to interpret satellite-observed real-time auroral intensity asymmetries in the two hemispheres in previous studies. We suggest that the hemispheric asymmetry is the combined effect of the prenoon-postnoon variations of the magnetosheath density and local ionospheric conductivity. Key Points There is a two-peak structure of the dayside oval in the Southern HemisphereThe structures of the dayside oval in the two hemispheres are asymmetricCombined effect of the variation of magnetosheath density and local conductivity ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84921779470&doi=10.1002%2f2014GL062345&partnerID=40&md5=80eba9858585f577b3e738047c485558
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6730
Appears in Collections: 气候减缓与适应
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作者单位: SOA Key Laboratory for Polar Science, Polar Research Institute of China, Shanghai, China
Recommended Citation:
Hu Z.-J.,Ebihara Y.,Yang H.-G.,et al. Hemispheric asymmetry of the structure of dayside auroral oval[J]. Geophysical Research Letters,2014-01-01,41(24).