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  • Time-Dependent Surface Impedance from Sferics

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    30065.pdf (292.8Kb)
    Author(s)
    O'Keefe, Y
    Thiel, DV
    O'Keefe, SG
    Griffith University Author(s)
    Thiel, David V.
    O'Keefe, Steven G.
    Year published
    2005
    Metadata
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    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 ...
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    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.
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    Journal Title
    IEEE Geoscience and Remote Sensing Letters
    Volume
    2
    Issue
    2
    Publisher URI
    http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=8859
    DOI
    https://doi.org/10.1109/LGRS.2004.843206
    Copyright Statement
    © 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.
    Subject
    Geomatic engineering
    Geoinformatics
    Physical geography and environmental geoscience
    Publication URI
    http://hdl.handle.net/10072/4307
    Collection
    • Journal articles

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