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Radiated Lightning Electromagnetic fields at different heights above ground

Nayak, SK and Thomas, Joy M (2006) Radiated Lightning Electromagnetic fields at different heights above ground. In: 28th International Conference on Lightning Protection ICLP 2006, 18-22 Sept 2006.

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Abstract

In this paper, the radiated electric and magnetic fields above a perfectly conducting ground at different heights from 10 m to 10 km and for lateral distances varying from 20 m to 10 km from a lightning return stroke channel are computed and the field waveforms are presented. It has been observed that the vertical electric field reverses its polarity with height and this height depends on the radial distance from the lightning channel. The magnitude of the horizontal electric field, on the other hand,increases with height up to a certain height and then reduces. The effect of variation in the rate of rise of lightning current (di/dt) and the velocity of return stroke current on the radiated electric and magnetic fields for the above heights and distances have also been studied. It is seen that the variation in maximum current derivative does not have a significant influence on the electric field when ground is assumed as a perfect conductor but it influences significantly the horizontal electric field when ground has finite conductivity. The velocity of propagation of return stroke current on the other hand has significant influence for both perfectly as well as finitely conducting ground conditions.

Item Type: Conference Paper
Keywords: Airborne vehicles;ground conductivity;indirect effects; lightning;transient electromagnetic field.
Department/Centre: Division of Electrical Sciences > High Voltage Engineering (merged with EE)
Date Deposited: 22 Nov 2011 09:28
Last Modified: 22 Nov 2011 09:28
URI: http://eprints.iisc.ernet.in/id/eprint/42117

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