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Edge Plasma Enhancements of Equatorial Plasma Depletions Observed by All-Sky Imager and the C/NOFS Satellite
Wu, Kun; Xu, Jiyao; Xiong, Chao; Yuan, Wei
作者部门空间科学部
发表期刊JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2018
卷号123期号:10页码:8835-8849
DOI10.1029/2018JA025809
ISSN2169-9380
语种英语
关键词edge plasma enhancement equatorial plasma depletion all-sky imager the C NOFS satellite
摘要Equatorial plasma depletions (EPDs) appearing at nighttime low latitudes were widely studied before. The edge plasma enhancements of equatorial plasma depletions (EPEEPDs) were repeatedly observed by the all-sky imager and the Communications/Navigation Outage Forecasting System (C/NOFS) satellite. However, the two-dimensional structures of EPEEPDs have not been well addressed. In this study, the airglow observations from one all-sky imager showed that the EPEEPDs occurred only in the east and west edges of EPDs but not at the poleward edge as earlier reported from the in situ measurements of low Earth orbit satellites. Four-year observations (2012-2015) from both our all-sky imager and the C/NOFS satellite have been analyzed. Compared to the airglow images, the in situ observation from C/NOFS showed that the edge plasma enhancements appeared to be less prominent with respect to the background, but both showed that the plasma enhancement was a high-incidence phenomenon, and the average incidence reached about 82% during days with EPDs observed. The occurrence of EPEEPDs showed similar characteristic as EPDs, such as the longitudinal dependences. The zonal extension of EPEEPDs showed different scale characteristics at different altitudes; its zonal extent varied with its altitudinal dependence. Four-year observations from C/NOFS satellite showed that the occurrence of EPEEPDs peaked during 20:00-22:00 LT. The result from all-sky imager showed that the relative intensity enhancement appeared contemporaneously, with maximal relative intensity exceeding 90%. We suggest that the generation mechanism of EPEEPDs is possibly related to the polarized electric field of EPDs. The plasma is more likely to be redistributed and exhibits as depletion and enhancement.
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文献类型期刊论文
条目标识符http://ir.nssc.ac.cn/handle/122/6601
专题空间科学部
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Wu, Kun,Xu, Jiyao,Xiong, Chao,et al. Edge Plasma Enhancements of Equatorial Plasma Depletions Observed by All-Sky Imager and the C/NOFS Satellite[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2018,123(10):8835-8849.
APA Wu, Kun,Xu, Jiyao,Xiong, Chao,&Yuan, Wei.(2018).Edge Plasma Enhancements of Equatorial Plasma Depletions Observed by All-Sky Imager and the C/NOFS Satellite.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,123(10),8835-8849.
MLA Wu, Kun,et al."Edge Plasma Enhancements of Equatorial Plasma Depletions Observed by All-Sky Imager and the C/NOFS Satellite".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 123.10(2018):8835-8849.
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