DOI: 10.1002/2014GL059703
论文题名: Differing current and optical return stroke speeds in lightning
作者: Liang C. ; Carlson B. ; Lehtinen N. ; Cohen M. ; Marshall R.A. ; Inan U.
刊名: Geophysical Research Letters
ISSN: 0094-10162
EISSN: 1944-9893
出版年: 2014
卷: 41, 期: 7 起始页码: 2561
结束页码: 2567
语种: 英语
英文关键词: current wave speed
; electrodynamics
; optical radiation wave speed
; return stroke
; thermodynamics
Scopus关键词: Electrodynamics
; Lightning
; Optical waveguides
; Thermodynamics
; Wave propagation
; Cloud-to-ground lightning
; Current waves
; High temperature air
; Lightning channel
; Maxwell's equations
; Optical radiations
; Propagation speed
; Return stroke
; Speed
; atmospheric electricity
; cloud to ground lightning
; electrodynamics
; heating
; high temperature
; radiation balance
; thermodynamics
; wave propagation
; wave velocity
英文摘要: During the return stroke in downward negative cloud-to-ground lightning, a current wave propagates upward from the ground along the lightning channel the current wave causes rapid heating of the channel and induces intense optical radiation the optical radiation wave propagation speed along the channel has been measured to be between 15 and 23 of the speed of light the current wave speed is commonly assumed to be the same but cannot be directly measured. Past modeling efforts treat either the thermodynamics or electrodynamics. We present the first model that simultaneously treats the coupled current and thermodynamic physics in the return stroke channel. We utilize numerical simulations using realistic high-temperature air plasma properties that self-consistently solve Maxwell's equations coupled with equations of air plasma thermodynamics the predicted optical radiation wave speed, rise time, and attenuation agree well with observations the model predicts significantly higher current return stroke speed. Key Points Study both the electrodynamics and thermodynamics of the return stroke channel The relationship between the current and optical wave is highly nonlinear The current wave speed is significantly higher than the optical wave speed © 2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84897215365&doi=10.1002%2f2014GL059703&partnerID=40&md5=4f2dc0817dcddaaf4b21a0de61edb07a
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7426
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Department of Electrical Engineering, Stanford University, Stanford, CA, United States
Recommended Citation:
Liang C.,Carlson B.,Lehtinen N.,et al. Differing current and optical return stroke speeds in lightning[J]. Geophysical Research Letters,2014-01-01,41(7).