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Validity of Simplified Approaches for the Evaluation of Lightning Electromagnetic Fields Above a Horizontally Stratified Ground
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
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2010 (English)In: IEEE transactions on electromagnetic compatibility (Print), ISSN 0018-9375, E-ISSN 1558-187X, Vol. 52, no 3, 657-663 p.Article in journal (Refereed) Published
Abstract [en]

We review in this paper simplified analytical expressions derived by Wait using the concept of attenuation function for the analysis of the propagation of lightning radiated electromagnetic fields over a horizontally stratified ground. Considerations regarding the use of these formulations as well as their domain of applicability are given. For the case, where the upper ground layer has a lower conductivity than the lower layer, the magnitude of the attenuation function can take values greater than unity. Time-domain waveforms of the vertical electric field along a horizontally stratified ground, obtained using the simplified formulations feature, an oscillatory behavior in their early-time response. The peak value of the field is also found to be larger than that corresponding to the case of a perfect ground. The accuracy of the Wait's formulations is examined taking as reference full-wave simulations obtained using the finite-difference time domain (FDTD) technique. FDTD simulations confirm the oscillatory waveform of the far field above a horizontally stratified ground (with an upper layer characterized by a lower conductivity than that of the lower layer), as well as the enhancement of the field peak compared to the case of a homogeneous, perfectly conducting ground.

Place, publisher, year, edition, pages
2010. Vol. 52, no 3, 657-663 p.
Keyword [en]
electromagnetic fields, electromagnetic wave propagation, finite difference time-domain analysis, attenuation function, finite-difference time domain technique, full-wave simulation, horizontally stratified ground, lightning radiated electromagnetic fields, oscillatory behavior, time-domain waveforms, upper ground layer, vertical electric field
National Category
Engineering and Technology
URN: urn:nbn:se:uu:diva-140363DOI: 10.1109/TEMC.2010.2045229ISI: 000283070600029OAI: oai:DiVA.org:uu-140363DiVA: diva2:383481
Available from: 2011-01-05 Created: 2011-01-05 Last updated: 2016-04-19Bibliographically approved

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