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Effect of vertically extended strike object on the distribution of current along the lightning channel

Effect of vertically extended strike object on the distribution of current along the lightning channel,10.1029/2002JD002119,Journal of Geophysical Res

Effect of vertically extended strike object on the distribution of current along the lightning channel   (Citations: 64)
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(1) On the basis of a distributed-source representation of the lightning channel, the mathematical formulations of the so-called engineering lightning return stroke models are generalized to take into account the presence of a vertically extended strike object. The strike object is modeled as a lossless uniform transmission line, and the reflection coefficients are all assumed to be constant. The distribution of current along the lightning channel for each model is expressed in terms of the ''undisturbed'' current, object height, and current reflection coefficients at the top and the bottom of the object. The undisturbed current is defined as the current that would flow in the channel if the current reflection coefficients at the extremities of the strike object were equal to zero, that is, the characteristic impedances of the lightning channel and the strike object were equal to each other and equal to the grounding impedance of the strike object. The distributed- source representation of the lightning channel adopted in this study allows for a more general and straightforward formulations of the generalized return-stroke models than the traditional representations implying a lumped current source at the bottom of the channel, including a self-consistent treatment of the impedance discontinuity at the tower top. INDEX TERMS: 3304 Meteorology and Atmospheric Dynamics: Atmospheric electricity; 3324 Meteorology and Atmospheric Dynamics: Lightning; 3367 Meteorology and Atmospheric Dynamics: Theoretical modeling; KEYWORDS: Lightning, tall tower, current distribution, reflections, lightning modeling
Journal: Journal of Geophysical Research , vol. 107, no. D23, 2002
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    • ...Pavanello et al. [3], [4] presented also calculations of the electric and magnetic fields using six engineering models [transmission line (TL), modified transmission line with linear decay (MTLL), modified transmission line with exponential decay (MTLE), Bruce and Golde (BG), traveling current source (TCS), extended to take into account the presence of a tall structure using a distributed-source approach [5], and the model proposed by Baba ...
    • ...This approach is based on the so-called distributed-source representation of the lightning channel [5] featuring a self-consistent treatment of the impedance discontinuity at the tower top...
    • ...In this study, we make use of the engineering models extended to take into account the presence of an elevated strike object [5]...
    • ...where h is the height of the tower, ρt and ρg are the tower top and bottom (ground) current reflection coefficients for upwardand downward-propagating waves, respectively, c is the speed of light, i0(t) is the so-called undisturbed current [5], P(z )i s a model-dependent function, u(t) is the Heaviside unit-step function, v is the return-stroke front speed, and v ∗ is the current-wave speed [2]...
    • ...1) The MTLE model [16], [17], including the presence of the tower [5]...

    Abbas Mosaddeghiet al. Radiated Fields From Lightning Strikes to Tall Structures: Effect of U...

    • ...The tower is represented as a uniform transmission line [56]...

    Abdolhamid Shooryet al. On the Measurement and Calculation of Horizontal Electric Fields From ...

    • ...In this work, we used the extension of the MTLE engineering model, as proposed by Mosaddeghi et al. [4], which is based on a distributed-source representation [7]...
    • ...For each event, the so-called ‘undisturbed current’ [7] is represented using the sum of two Heidler’s functions [9]...

    A. Mosaddeghiet al. Lightning return strokes to tall towers: Ability of engineering models...

    • ...We then continue with elaborating on the proposed modeling approach, which is based on the modified transmission line (TL) “engineering” model that takes into consideration the presence of the highrise strike object [12], but which is further modified in order to deal with the model-specific physical discontinuity at the lightning channel (LC) front...

    Ivan Boevet al. Determination of Current Within the Lightning Path in the Case of Ligh...

    • ...Figure 2. Distributed‐source representation of the lightning channel in engineering return stroke models for the case of no strike object but considering reflections at ground (adopted from Rachidi et al. [2002])...
    • ...In generalizing the above derivation to other engineering models, we follow the approach used by Rachidi et al. [2002]...

    Abdolhamid Shooryet al. Relativistic Doppler effect in an extending transmission line: Applica...

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