Transient Surface Impedance Measurements using Spherics – Source Identification and Characterisation

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Thiel, DV
Mogensen, G
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Paul B. Smith

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2010
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610357 bytes

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Sydney, Australia

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Abstract

Transient recordings of the electric and magnetic fields over the audio-band display significant transient pulses (spherics) which can be used for surface impedance measurements providing the lighting strike is distant and predominantly vertical. Horizontal lighting strikes, other atmospheric noise and instrument noise creates incorrect surface impedance data. Automated spheric selection can be made by calculating the sliding window correlation coefficient, and observing a period of elevated values followed by a rapid transition to a negative value. Data selected in this manner yield coherent surface impedance values.

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Proceedings - 2010 12th International Conference on Electromagnetics in Advanced Applications, ICEAA'10

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© 2010 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.

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Electrical and electromagnetic methods in geophysics

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