Time-Dependent Surface Impedance from Sferics

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Title Time-Dependent Surface Impedance from Sferics
Author O'Keefe, Yvette; Thiel, David Victor; O'Keefe, Steven Gregory
Journal Name IEEE Geoscience and Remote Sensing Letters
Editor William J Emery
Year Published 2005
Place of publication US
Publisher Institute of Electrical and Electronic Engineers
Abstract Attempts to use discrete sferics for low frequency impedance mapping have relied on Fourier analysis to derive time independent frequency profiles of the earth. A one dimensional transmission line model of the earth above a perfectly conducting layer is used to demonstrate that the impedance is time dependent. Assuming a sferic type transient for the applied magnetic field, the electric field is changed significantly corresponding to the time of flight of the radiation in the lossy earth. In an attempt to maintain this timing information and its' link with the frequency components, the wavelet transform was implemented to analyse the data. The associated surface impedance may be approximated as the input impedance of the earth during excitation but reverts to the impedance of free space once the source field returns to zero.
Peer Reviewed Yes
Published Yes
Publisher URI http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=8859
Alternative URI http://dx.doi.org/10.1109/LGRS.2004.843206
Copyright Statement Copyright 2005 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Volume 2
Issue Number 2
Page from 104
Page to 107
ISSN 1545-598X
Date Accessioned 2006-02-01
Language en_AU
Faculty Faculty of Engineering and Information Technology
Subject PRE2009-Electromagnetism
URI http://hdl.handle.net/10072/4307
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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