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2 results on '"mixed-mode initial continuous current pulses"'

1. Characteristics of different charge transfer modes in upward flashes inferred from simultaneously measured currents and fields

Author

Lixia He, Mohammad Azadifar, Quanxin Li, Marcos Rubinstein, Vladimir A. Rakov, Arturo Mediano, Davide Pavanello, and Farhad Rachidi

Subjects
poles and towers, lightning, inferred pulse velocities, mm pulses, inferred current attenuation constants, mtle model, downward flashes, upward negative flashes, säntis tower, mixed-mode initial continuous current pulses, m-component-type icc pulses, total charge, electric fields, return stroke, charge transfer modes, return-stroke pulses, classical m-component pulses, guided wave model, size 0.3 km to 0.8 km, altitude 1.0 km to 2.0 km, distance 15.0 km, Electrical engineering. Electronics. Nuclear engineering, TK1-9971, Electricity, QC501-721
Abstract

The authors present an analysis of different charge transfer modes during upward negative flashes. The analysis includes a total number of 94 pulses that occurred during two upward negative flashes recorded at the Säntis Tower. The pulses included 59 mixed-mode (MM) initial continuous current (ICC) pulses, 17 M-component-type ICC (M-ICC) pulses, 8 return-stroke pulses, and 10 classical M-component (MC) pulses. It is found that the initial stage of the flash is responsible for the largest share of the total charge transferred to the ground. Simulation results for the electric fields associated with the considered charge transfer modes are presented and discussed. Return stroke (RS) and MM pulses were simulated adopting the MTLE model, while MCs and M-ICC pulses were simulated using the guided wave model of Rakov et al. The simulated results are shown to be in good agreement with simultaneous records of electric fields measured at a distance of 15 km from the Säntis Tower. The inferred velocities for MCs and M-ICC pulses range from 2.0 × 10^7 to 9.0 × 10^7 m/s, and the corresponding junction point heights range from 1.0 to 2.0 km. The inferred pulse velocities for RSs and MM pulses range from 1.3 × 10^8 to 1.65 × 10^8 m/s. The inferred current attenuation constants of the MTLE model obtained in this study range from 0.3 to 0.8 km, lower than the value of 2 km previously suggested for RSs in downward flashes. The obtained results support the assumption that the mode of charge transfer to the ground giving rise to MM pulses is similar to that of RSs. The results are also in support of the generally assumed similarity between M-ICC pulses and classical MCs.

Published
2019
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2. Characteristics of different charge transfer modes in upward flashes inferred from simultaneously measured currents and fields

Author

Lixia He, Mohammad Azadifar, Quanxin Li, Marcos Rubinstein, Vladimir A. Rakov, Arturo Mediano, Davide Pavanello, Farhad Rachidi, Electromagnetic Compatibility Laboratory (EMC LAB), Ecole Polytechnique Fédérale de Lausanne (EPFL), Department of Atmospheric Physics, Nanjing University of Information Science and Technology (NUIST), University of Applied Sciences of Western Switzerland, Department of Electrical Engineering, Wuhan University [China], Department of Electrical and Computer Engineering, University of Florida [Gainesville] (UF), Department Electronics and Communication Engineering, University of Zaragoza - Universidad de Zaragoza [Zaragoza], Institute of Sustainable Energy, Financial supports from the Swiss National Science Foundation(Project No. 200021_147058), and European Project: 737033,LLR

Subjects
charge transfer modes, 010504 meteorology & atmospheric sciences, lcsh:QC501-721, Energy Engineering and Power Technology, return stroke, 02 engineering and technology, 01 natural sciences, electric fields, mm pulses, guided wave model, mtle model, mixed-mode initial continuous current pulses, total charge, altitude 1.0 km to 2.0 km, Electric field, inferred current attenuation constants, m-component-type icc pulses, lcsh:Electricity, 0202 electrical engineering, electronic engineering, information engineering, inferred pulse velocities, Electrical and Electronic Engineering, downward flashes, 0105 earth and related environmental sciences, Physics, Range (particle radiation), [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Guided wave testing, Attenuation, size 0.3 km to 0.8 km, upward negative flashes, 020206 networking & telecommunications, Charge (physics), säntis tower, distance 15.0 km, Lightning, poles and towers, Computational physics, Pulse (physics), return-stroke pulses, Atmospheric electricity, lcsh:Electrical engineering. Electronics. Nuclear engineering, classical m-component pulses, lightning, lcsh:TK1-9971
Abstract

International audience; The authors present an analysis of different charge transfer modes during upward negative flashes. The analysis includes a total number of 94 pulses that occurred during two upward negative flashes recorded at the Säntis Tower. The pulses included 59 mixed-mode (MM) initial continuous current (ICC) pulses, 17 M-component-type ICC (M-ICC) pulses, 8 returnstroke pulses, and 10 classical M-component (MC) pulses. It is found that the initial stage of the flash is responsible for the largest share of the total charge transferred to the ground. Simulation results for the electric fields associated with the considered charge transfer modes are presented and discussed. Return stroke (RS) and MM pulses were simulated adopting the MTLE model, while MCs and M-ICC pulses were simulated using the guided wave model of Rakov et al. The simulated results are shown to be in good agreement with simultaneous records of electric fields measured at a distance of 15 km from the Säntis Tower. The inferred velocities for MCs and M-ICC pulses range from 2.0 × 10 7 to 9.0 × 10 7 m/s, and the corresponding junction point heights range from 1.0 to 2.0 km. The inferred pulse velocities for RSs and MM pulses range from 1.3 × 10 8 to 1.65 × 10 8 m/s. The inferred current attenuation constants of the MTLE model obtained in this study range from 0.3 to 0.8 km, lower than the value of 2 km previously suggested for RSs in downward flashes. The obtained results support the assumption that the mode of charge transfer to the ground giving rise to MM pulses is similar to that of RSs. The results are also in support of the generally assumed similarity between M-ICC pulses and classical MCs.

Published
2020
Full Text
View/download PDF

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