DOI: 10.1002/grl.50910
论文题名: Mechanism of column and carrot sprites derived from optical and radio observations
作者: Qin J. ; Celestin S. ; Pasko V.P. ; Cummer S.A. ; McHarg M.G. ; Stenbaek-Nielsen H.C.
刊名: Geophysical Research Letters
ISSN: 0094-8583
EISSN: 1944-8314
出版年: 2013
卷: 40, 期: 17 起始页码: 4777
结束页码: 4782
语种: 英语
英文关键词: carrot sprites
; column sprites
; lightning
; streamers
Scopus关键词: carrot sprites
; Charge Moment Change
; Ionization frequency
; Lightning characteristics
; Lightning currents
; Negative streamers
; streamers
; Transient luminous events
; Electric fields
; Ionosphere
; Lightning
; electric field
; ionization
; lightning
; plasma
; radio wave
; sprite
; upper atmosphere
; waveform analysis
; Daucus carota
英文摘要: The lightning current waveforms observed simultaneously with high-speed video records of a column and a carrot sprite event are incorporated in a plasma fluid model to provide quantitative explanation of these two distinct morphological classes of transient luminous events. We calculate the strength of the lightning-induced electric field at sprite altitudes using a time integral of the ionization frequency ∫0tνi(E/N)dt. For the studied two events, modeling results indicate that these integral values never exceed 18 in the lower ionosphere, which is the minimum value required for the initiation of streamers from single seed electrons according to the Raether-Meek criterion. It is therefore suggested that the presence of electron inhomogeneities is a necessary condition for the initiation of sprite streamers. It is further demonstrated using streamer modeling that a minimum value of the integral ∼10 is necessary to initiate upward negative streamers from inhomogeneities, corresponding to a minimum charge moment change of ∼500 C km under typical nighttime conditions. If the integral values in the entire upper atmosphere are smaller than ∼10, only column sprites can be produced, dominated by downward positive streamers. Key Points The mechanism of column and carrot sprites is derived Sprite morphology and lightning characteristics are closely related Good agreement between observations and simulations has been achieved ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84883706465&doi=10.1002%2fgrl.50910&partnerID=40&md5=91801f74e7053d80c6980a4ac78276f4
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5847
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Communications and Space Sciences Laboratory, Department of Electrical Engineering, Pennsylvania State University, 227 Electrical Engineering East, University Park, PA 16802-2706, United States
Recommended Citation:
Qin J.,Celestin S.,Pasko V.P.,et al. Mechanism of column and carrot sprites derived from optical and radio observations[J]. Geophysical Research Letters,2013-01-01,40(17).