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A Novel Interpretation of the Electromagnetic Fields of Lightning Return Strokes
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
Karolinska Inst, Stockholm, Sweden.
2019 (English)In: Atmosphere, ISSN 2073-4433, E-ISSN 2073-4433, Vol. 10, no 1, article id 22Article in journal (Refereed) Published
Abstract [en]

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 fields (or acceleration fields), respectively. In the literature, the electromagnetic fields generated by lightning return strokes are presented using the field components associated with short dipoles, and in this description the one-to-one association of the electromagnetic field terms with the physical process that gives rise to them is lost. In this paper, we have derived expressions for the electromagnetic fields using field equations associated with accelerating (and moving) charges and separated the resulting fields into static, velocity and radiation fields. The results illustrate how the radiation fields emanating from the lightning channel give rise to field terms varying as <mml:semantics>1/r</mml:semantics> and <mml:semantics>1/r2</mml:semantics>, the velocity fields generating field terms varying as <mml:semantics>1/r2</mml:semantics>, and the static fields generating field components varying as <mml:semantics>1/r2</mml:semantics> and <mml:semantics>1/r3</mml:semantics>. These field components depend explicitly on the speed of propagation of the current pulse. However, the total field does not depend explicitly on the speed of propagation of the current pulse. It is shown that these field components can be combined to generate the field components pertinent to the dipole technique. However, in this conversion process the connection of the field components to the physical processes taking place at the source that generate these fields (i.e., static charges, uniformly moving charges and accelerating charges) is lost.

Place, publisher, year, edition, pages
MDPI , 2019. Vol. 10, no 1, article id 22
Keywords [en]
Electromagnetic fields, return strokes, dipole fields, accelerating charges, radiation fields, static fields, velocity fields
National Category
Mathematical Analysis Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-378742DOI: 10.3390/atmos10010022ISI: 000459133000022OAI: oai:DiVA.org:uu-378742DiVA, id: diva2:1295221
Funder
Swedish Research Council, VR-2015-05026Available from: 2019-03-11 Created: 2019-03-11 Last updated: 2020-01-08Bibliographically approved

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