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Vernon Cooray and Gerald Cooray
Electric and/or magnetic fields are generated by stationary charges, uniformly moving charges and accelerating charges. These field components are described in the literature as static fields, velocity fields (or generalized Coulomb field) and radiation ...
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Vernon Cooray
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 l...
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Vernon Cooray, M. Fernando, L. Gunasekara and S. Nanayakkara
Propagation effects on the narrow bipolar pulses (NBPs) or the radiation fields generated by compact cloud discharges as they propagate over finitely conducting ground are presented. The results were obtained using a sample of NBPs recorded with high tim...
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Pasan Hettiarachchi, Vernon Cooray, Gerhard Diendorfer, Hannes Pichler, Joseph Dwyer and Mahbubur Rahman
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Liliana Arevalo and Vernon Cooray
In the literature, there are different criteria to represent the formation of a leader channel in short and long gap discharges. Due to the complexity of the physics of the heating phenomena, and the limitations of the computational resources, a simplifi...
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Vernon Cooray and Gerald Cooray
Recently, we published two papers in this journal. One of the papers dealt with the action of the radiation fields generated by a traveling-wave element and the other dealt with the momentum transferred by the same radiation fields and their connection t...
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Mohd Muzafar Ismail, Mahbubur Rahman, Vernon Cooray, Mahendra Fernando, Pasan Hettiarachchi and Dalina Johari
In this study, electromagnetic field radiation bursts known as chaotic pulse trains (CPTs) and regular pulse trains (RPTs) generated by lightning flashes were analyzed. Through a numerical analysis it was found that a typical CPT could be generated by su...
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Vernon Cooray and Liliana Arevalo
A physical model based on the mechanism observed in experimental investigations is introduced to describe the formation of negative leader steps. Starting with a small length of a space leader located at the periphery of the negative streamer system of t...
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Pasan Hettiarachchi, Vernon Cooray, Mahbubur Rahman and Joseph Dwyer
The energy deposited from X-rays generated by 1 m long laboratory sparks in air created by 950 kV negative lightning impulses on scintillated detectors was measured. Assuming the X-ray energy detected in such sparks results from the accumulation of multi...
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