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Atmosphere 2018, 9(6), 225; https://doi.org/10.3390/atmos9060225

The Similarity of the Action of Franklin and ESE Lightning Rods under Natural Conditions

Department of Engineering Sciences, Uppsala University, 752 37 Uppsala, Sweden
This paper is based on part of an invited lecture given at the International Conference on Lightning Protection, Cagliari, Italy, 2010.
Received: 29 May 2018 / Revised: 5 June 2018 / Accepted: 6 June 2018 / Published: 11 June 2018
(This article belongs to the Section Climatology and Meteorology)
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Abstract

In the lightning rods categorized as Early Streamer Emission (ESE) types, an intermittent voltage impulse is applied to the lightning rod to modulate the electric field at its tip in an attempt to speed up the initiation of a connecting leader from the lightning rod when it is under the influence of a stepped leader moving down from the cloud. In this paper, it is shown that, due to the stepping nature of the stepped leader, there is a natural modulation of the electric field at the tip of any lightning rod exposed to the lightning stepped leaders and this modulation is much more intense than any artificial modulation that is possible under practical conditions. Based on the results, it is concluded that artificial modulation of the electric field at the tip of lightning rods by applying voltage pulses is an unnecessary endeavor because the nature itself has endowed the tip of the lightning rod with a modulating electric field. Therefore, as far as the effectiveness of artificial modulation of the tip electric field is concerned, there could be no difference in the lightning attachment efficiency between ESE and Franklin lightning rods. View Full-Text
Keywords: Franklin lightning rod; Early Streamer Emission, ESE lightning rod; lightning attachment Franklin lightning rod; Early Streamer Emission, ESE lightning rod; lightning attachment
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Cooray, V. The Similarity of the Action of Franklin and ESE Lightning Rods under Natural Conditions. Atmosphere 2018, 9, 225.

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