DOI: 10.1002/2013GL058294
论文题名: Formation of sprite streamers at subbreakdown conditions from ionospheric inhomogeneities resembling observed sprite halo structures
作者: Kosar B.C. ; Liu N. ; Rassoul H.K.
刊名: Geophysical Research Letters
ISSN: 0094-8296
EISSN: 1944-8027
出版年: 2013
卷: 40, 期: 23 起始页码: 6282
结束页码: 6287
语种: 英语
英文关键词: halo structures
; ionospheric disturbances
; lightning
; sprites
; streamers
; subbreakdown
Scopus关键词: HALO structure
; Ionospheric disturbance
; sprites
; streamers
; subbreakdown
; Ionosphere
; Lightning
; Ionospheric measurement
; disturbance
; inhomogeneity
; ionosphere
; lightning
; numerical model
; sprite
英文摘要: Modeling results of sprite streamer formation from large ionospheric inhomogeneities or patches (several tens to hundreds of meter wide) indicate that positive streamers can be initiated at subbreakdown conditions from the inhomogeneities with a density comparable to sprite halo densities. For spherical patches with a given radius, the minimum density required for streamer initiation decreases with increasing ambient field. For a given density, the minimum size of the inhomogeneity decreases with increasing ambient field. The modeling results on the associated optical emissions show that a luminous spherical-like cap appears around the lower tip of the ionization patch before streamer initiation, and the streamer is initiated from the bottom of this cap, which appears to be similar to streamer initiation from luminous structures in the lower ionosphere recorded by recent high-speed videos. Our study suggests that if the sprite halo front is unstable, inhomogeneities developing from it can initiate sprite streamers at subbreakdown conditions. Key Points Inhomogeneities with sprite halo density can initiate sprite streamers The associated luminosity distribution agrees with observations The inhomogeneities initiating streamers may come from an unstable halo front ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84888816511&doi=10.1002%2f2013GL058294&partnerID=40&md5=a883326a3458b75f1192411a7d9a738f
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5560
Appears in Collections: 气候减缓与适应
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作者单位: Geospace Physics Laboratory, Department of Physics and Space Sciences, Florida Institute of Technology, 150 W. University Blvd., Melbourne, FL 32901, United States
Recommended Citation:
Kosar B.C.,Liu N.,Rassoul H.K.. Formation of sprite streamers at subbreakdown conditions from ionospheric inhomogeneities resembling observed sprite halo structures[J]. Geophysical Research Letters,2013-01-01,40(23).