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Monday, May 18, 2020 | History

3 edition of Tortuosity of lightning return stroke channels found in the catalog.

Tortuosity of lightning return stroke channels

Tortuosity of lightning return stroke channels

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  • 33 Currently reading

Published by National Aeronautics and Space Administration, Goddard Space Flight Center in Greenbelt, Md .
Written in English

    Subjects:
  • Lightning -- United States -- Mathematical models.

  • Edition Notes

    StatementD.M. Le Vine, Bruce Gilson.
    SeriesNASA technical memorandum -- 86104.
    ContributionsGilson, Bruce., Goddard Space Flight Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL17801769M

      It is this hot channel produced by the return stroke that we see during cloud-to-ground lightning, and the rapid expansion and subsequent contraction of the hot channel . Estimation of Lightning Return Stroke Velocities Matthew Jay Genesis Langum Samantha Tabor lightning channel, it is reasonable to claim that the channel is at least as tortuous in the normal direction as it is in the visible plane. When a basic tortuosity estimation is factored in to calculate a three­dimensional propagation speed.

    Due to the complexity of the physical mechanism of lightning and mathematical formula, Parameter range and large amount of calculation, at present the mathematical model of lightning simulation is always empirical or inconsistent with the physical properties of lightning. In order to bring down the complexity, and to advance physical properties, of the traditional lightning model the paper. Abstract—A novel approach for developing the electromagnetic fields from a lightning return stroke which follows a tortuous path will be presented. The proposed model is unique in that it recognizes that the symmetrical tortuosity of lightning directly impacts the observable distance r, which in turn, alters the resulting electromagnetic fields.

      Abstract. New engineering modified transmission line models of lightning strokes are presented in this paper. Their computational results for lightning electromagnetic field (LEMF) at various distances from lightning discharges are in good agreement with experimental results that are usually used for validating electromagnetic, engineering and distributed-circuit by: 4. The electromagnetic fields associated with tortuous lightning channels are usually characterised by a pronounced fine structure. This work investigates and quantifies the effects of channel tortuosity on the return stroke electromagnetic field shapes in the close lightning environment (the range up to m from the lightning striking point).Author: J. Peer and A. Kendl.


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Tortuosity of lightning return stroke channels Download PDF EPUB FB2

Hill (), using high speed photography, analyzed statistically the tortuosity of the return stroke channel and found that the main channel is characterized by tortuosity on a scale from 1 m to over 1 km with the channel direction azimuth normally distributed with a mean of 16°.Cited by: 6.

COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.

On the Influence of Channel Tortuosity on Electric Fields Generated by Lightning Return Strokes at Close Distance Carlo Petrarca*, Simone Minucci, and Amedeo Andreotti Abstract—In this paper the results of the estimated electric field associated with tortuous lightning paths at close distance (50m to m) are : Carlo Petrarca, Simone Minucci, Amedeo Andreotti.

account the tortuosity of the lightning channel, the MTLL model may be written as IlðÞ0;t ¼ I 0ðÞt−l0=v ðÞ1−l0=Ltot ð9Þ where l0ðÞS is the tortuous channel length from the source point S to the base of the return stoke channel, as shown in Fig and L tot is the total length of the tortuous return stroke channel.

A return stroke model, developed with the current generation concept, has been used. The random tortuosity of the lightning channel is represented by a numerical model which also enables the linear charge density modeling. It is shown, that when the tortuosity of the lightning channel Author: Juan Diego Pulgarín-Rivera, Camilo Younes, Mauricio Vargas.

> Safety > Understanding Lightning: Return Stroke The return stroke is the very bright visible flash that we see as lightning, caused by the rapid discharge of electricity.

Once Tortuosity of lightning return stroke channels book step leader makes contact with a streamer, the negative charge that has accumulated along the leader channel flows rapidly to ground. Abstract: The electromagnetic fields associated with tortuous lightning channels are usually characterised by a pronounced fine structure.

This work investigates and quantifies the effects of channel tortuosity on the return stroke electromagnetic field shapes in the close lightning environment (the range up to m from the lightning striking point).Cited by: 3.

fields associated with lightning return strokes J. Peer and A. Kendl Institute for Ion Physics and Applied Physics, University of Innsbruck, Technikerstr. 25, A Innsbruck, Austria Abstract The electromagnetic fields associated with tortuous lightning channels are usually characterised by a pronounced fine structure.

the return stroke is several cm in diameter; after the first discharge, it is possible for another leader to propagate down the channel created by the first stepped leader. This new leader is called a dart leader. a subsequent return stroke propagates upward from the ground to the cloud. this can happen times in quick succession.

Early in a return stroke, pressure in the channel is several times (maybe a few 10s of times) atmospheric pressure. The lightning channel expands rapidly outward initially as a shock wave. Much of the energy in a lightning stroke is dissipated during the formation and outward growth of.

The analysis of radiation from a lightning return stroke requires both channel geometry and the current waveform that propagates along the channel. Analysis and interpretation in the past have been performed with simplified channel geometries or simplified current models.

Our objective has been to gain insight into the effects of channel tortuosity on radiated electric field waveforms. This work investigates and quantifies the effects of channel tortuosity on the return stroke electromagnetic field shapes in the close lightning environment (the range up to m from the.

It is concluded that the magnitude of the effect due to tortuosity is highly dependent upon the current model and the range of the lightning flash. The analysis of radiation form a lightning return stroke requires both channel geometry and the current waveform that propagates along the : Y.

Liaw. In this paper, the influence of the lightning channel tortuosity on the spatial and temporal return stroke current distribution, is evaluated. A return stroke model, developed with the current.

We compare five lightning return stroke current models that exhibit a simple relationship between the current at the return stroke channel‐base and the current along the return stroke channel, namely the Bruce‐Golde (BG) model, the transmission line (TL) model, the Master, Uman, Lin, and Standler (MULS) model, the Traveling Current Source (TCS) model, and the Modified Transmission Line.

Note also that the relation between the return stroke and the optical speeds can also be affected by the shape of the channel. The channel tortuosity and channel inclination have been considered in several studies (see, e.g., Section VIII. C of [1]). In this paper, we have considered return stroke current speeds ranging from m/s.

Evaluation of a first return stroke model considering the lightning channel tortuosity. Indian JOUlna)of Radio & Space Physics Vol. 2, Decemberpp. Magnetic Field within the Return Stroke Channel of Lightning I JAGDISH RAI, A.

SINGH & S. SAHA Electronics & Radio Physics Laboratory, Department of Physics, Banaras Hindu University, Varanasi Received 2 December ; revised received 10 September Cited by: 1. 1- The lightning channel is a vertical channel on the surface of the ground.

2- The efiect of lightning branches on the flelds is ignored. 3- The ground conductivity is assumed to be inflnity. 4- The surface of the ground is assumed to be °at. RETURN STROKE CURRENT The return stroke current can be considered in two areas i.e., the. stroke channel, and the relation between leader and return-stroke models.

Various aspects of the calculation of lightning electric and magnetic fields in which return-stroke models are used to specify the source are considered, including equations for fields and channel-base current, as well as a discussion of channel tortuosity and branches.

Various aspects of the calculation of lightning electric and magnetic fields in which return stroke models are used to specify the source are considered, including equations for fields and channel-base current, as well as a discussion of channel tortuosity and by: move downward.

The smaller scale tortuosity in the channel may be formed when the leader steps are formed, or may be formed by action of the magnetic forces associated with the return stroke current.

As is probably becoming more and more apparent with each succeeding chapter in this book, there is an awful lot we still don’t know about lightning.CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Abstract—A novel approach for developing the electromagnetic fields from a lightning return stroke which follows a tortuous path will be presented.

The proposed model is unique in that it recognizes that the symmetrical tortuosity of lightning directly impacts the observable distance r, which in turn, alters the.