DOI: 10.1002/2013GL058983
论文题名: Electrostatic modeling of intracloud stepped leader electric fields and mechanisms of terrestrial gamma ray flashes
作者: Pasko V.P.
刊名: Geophysical Research Letters
ISSN: 0094-10531
EISSN: 1944-10262
出版年: 2014
卷: 41, 期: 1 起始页码: 179
结束页码: 185
语种: 英语
英文关键词: lightning
Scopus关键词: Bidirectional leader
; Bidirectional system
; Electrostatic modeling
; Electrostatic moments
; High energy photons
; Quadratic function
; Quantitative interpretation
; Terrestrial Gamma ray Flashes
; Dipole moment
; Electric fields
; Gamma rays
; Method of moments
; Lightning
; atmospheric electricity
; climate modeling
; cloud cover
; electric field
; gamma ray radiation
英文摘要: Understanding of electric field configurations created by long intracloud (IC) stepped leaders is of significant interest for understanding how these events produce bursts of high-energy photons in the Earth's atmosphere, commonly referred to as terrestrial gamma ray flashes (TGFs). In the present work modeling results using the electrostatic moment method solutions are used for quantitative interpretation of electric fields observed at close ∼200 m and long ∼30 km ranges from IC stepped leaders. The modeling results are consistent with the existence and continuous advancement of VHF-dark positive leaders at the positive end of the bidirectional leader system. It is demonstrated that the electric dipole moment of the entire leader system is a quadratic function of the leader length, and the dipole moment changes due to the leader steps increase proportionally to the overall leader length (i.e., even when step length remains constant), in good agreement with observations. The results indicate that the dipole moment changes on the order of tens of C km and current moment changes on the order of tens of kA km, that have been associated with TGFs, are essential attributes of long IC stepped leaders and directly follow from their intrinsic large-scale charge dynamics. Key Points Results provide evidence of VHF-dark positive leaders in bidirectional system Dipole moment of the leader system is a quadratic function of the leader length Current moment changes tens of kA km in TGFs are attributes of IC leaders ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84896719137&doi=10.1002%2f2013GL058983&partnerID=40&md5=ff2ed3b40038efb923202fd9a9fadd23
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7795
Appears in Collections: 气候减缓与适应
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作者单位: CSSL Laboratory, Department of Electrical Engineering, Pennsylvania State University, University Park, PA, United States
Recommended Citation:
Pasko V.P.. Electrostatic modeling of intracloud stepped leader electric fields and mechanisms of terrestrial gamma ray flashes[J]. Geophysical Research Letters,2014-01-01,41(1).