A Macroscopic Model for First Return Stroke of Lightning

Raysaha, Rosy Balaram and Kumar, Udaya and Thottappillil, Rajeev (2011) A Macroscopic Model for First Return Stroke of Lightning. In: IEEE Transactions on Electromagnetic Compatibility, 53 (3). pp. 782-791.

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Abstract

A lightning return stroke model for a downward flash is proposed. The model includes underlying physical phenomena governing return stroke evolution, namely, electric field due to charge distributed along the leader and cloud, transient enhancement of series channel conductance at the bridging regime, and the nonlinear variation of channel conductance, which supports the return stroke current evolution. Thermal effects of free burning arc at the stroke wave front and its impact on channel conductance are studied. A first-order arc model for determining the dynamic channel conductance along with a field-dependent conductivity for corona sheath is used in the model. The model predicts consistent current propagation along the channel with regard to current amplitude and return stroke velocity. The model is also capable of predicting the remote electromagnetic fields that are consistent with the experimental observations.

Item Type:	Journal Article
Publication:	IEEE Transactions on Electromagnetic Compatibility
Publisher:	IEEE
Additional Information:	Copyright 2011 IEEE. Personal use of this material is permitted.However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords:	Current evolution;dynamic channel conductance; electromagnetic fields;lightning return stroke
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	15 Sep 2011 11:01
Last Modified:	15 Sep 2011 11:01
URI:	http://eprints.iisc.ac.in/id/eprint/40453

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