DOI: 10.1002/2017JD027050
Scopus记录号: 2-s2.0-85040199832
论文题名: Determination of the Global-Average Charge Moment of a Lightning Flash Using Schumann Resonances and the LIS/OTD Lightning Data
作者: Boldi R. ; Williams E. ; Guha A.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 1 起始页码: 108
结束页码: 123
语种: 英语
英文关键词: Earth-ionosphere cavity
; global lightning
; modeling
; normal mode equations
; Schumann resonances
Scopus关键词: confidence interval
; electric field
; electromagnetic field
; equation
; global perspective
; instrumentation
; ionosphere
; lightning
; model
; modeling
; regression analysis
; resonance
; sensor
; signal
; spectrum
; Rhode Island
; United States
英文摘要: In this paper, we use (1) the 20 year record of Schumann resonance (SR) signals measured at West Greenwich Rhode Island, USA, (2) the 19 year Lightning Imaging Sensor (LIS)/Optical Transient Detector (OTD) lightning data, and (3) the normal mode equations for a uniform cavity model to quantify the relationship between the observed Schumann resonance modal intensity and the global-average vertical charge moment change M (C km) per lightning flash. This work, by integrating SR measurements with satellite-based optical measurements of global flash rate, accomplishes this quantification for the first time. To do this, we first fit the intensity spectra of the observed SR signals to an eight-mode, three parameter per mode, (symmetric) Lorentzian line shape model. Next, using the LIS/OTD lightning data and the normal mode equations for a uniform cavity model, we computed the expected climatological-daily-average intensity spectra. We then regressed the observed modal intensity values against the expected modal intensity values to find the best fit value of the global-average vertical charge moment change of a lightning flash (M) to be 41 C km per flash with a 99% confidence interval of ±3.9 C km per flash, independent of mode. Mode independence argues that the model adequately captured the modal intensity, the most important fit parameter herein considered. We also tested this relationship for the presence of residual modal intensity at zero lightning flashes per second and found no evidence that modal intensity is significantly different than zero at zero lightning flashes per second, setting an upper limit to the amount of nonlightning contributions to the observed modal intensity. ©2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114702
Appears in Collections: 气候减缓与适应
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作者单位: College of Natural and Health Sciences, Zayed University, Dubai, United Arab Emirates; Parsons Laboratory, Massachusetts Institute of Technology, Cambridge, MA, United States; Department of Physics, Tripura UniversityTripura, India
Recommended Citation:
Boldi R.,Williams E.,Guha A.. Determination of the Global-Average Charge Moment of a Lightning Flash Using Schumann Resonances and the LIS/OTD Lightning Data[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(1)