DOI: 10.1002/2014GL059568
论文题名: Time causal operational estimation of electric fields induced in the Earth's lithosphere during magnetic storms
作者: Love J.J. ; Swidinsky A.
刊名: Geophysical Research Letters
ISSN: 0094-10182
EISSN: 1944-9913
出版年: 2014
卷: 41, 期: 7 起始页码: 2266
结束页码: 2274
语种: 英语
英文关键词: geoelectric fields
; geomagnetic fields
; induction
; magnetic storm
Scopus关键词: Electric fields
; Electric properties
; Geomagnetism
; Time series
; Electric power grids
; Electrical conductivity
; Geoelectric
; Geomagnetic fields
; induction
; Magnetic storms
; Mathematical formalism
; Real time monitoring
; Estimation
; algorithm
; atmospheric electricity
; electric field
; electrical conductivity
; estimation method
; geoelectric field
; geomagnetic storm
; half space
; lithosphere
; observatory
; Japan
英文摘要: In support of projects for monitoring geomagnetic hazards for electric power grids, we develop a simple mathematical formalism, consistent with the time causality of deterministic physics, for estimating electric fields that are induced in the Earth's lithosphere during magnetic storms. For an idealized model of the lithosphere, an infinite half-space having uniform electrical conductivity properties described by a galvanic tensor, we work in the Laplace-transformed frequency domain to obtain a transfer function which, when convolved with measured magnetic field time series, gives an estimated electric field time series. Using data collected at the Kakioka, Japan observatory, we optimize lithospheric conductivity parameters by minimizing the discrepancy between model-estimated electric field variation and that actually measured. With our simple model, we can estimate 87% of the variance in storm time Kakioka electric field data; a more complicated model of lithospheric conductivity would be required to estimate the remaining 13% of the variance. We discuss how our estimation formalism might be implemented for geographically coordinated real-time monitoring of geoelectric fields. Key Points Method is presented for calculating induced lithospheric electric fields Comparison of results is made with geoelectric field data Real-time algorithms can be developed from the method presented © 2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84899034072&doi=10.1002%2f2014GL059568&partnerID=40&md5=be3c744162c97bf9cec9984d42838f2a
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7446
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Geomagnetism Program, U.S. Geological Survey, Denver, CO, United States
Recommended Citation:
Love J.J.,Swidinsky A.. Time causal operational estimation of electric fields induced in the Earth's lithosphere during magnetic storms[J]. Geophysical Research Letters,2014-01-01,41(7).