Analysis of light emission and Schlieren from short gap high voltage streamers representing lightning impulses

Mitchard, D., Widger, P. ORCID: https://orcid.org/0000-0002-0662-8590 and Haddad, A. ORCID: https://orcid.org/0000-0003-4153-6146 2021. Analysis of light emission and Schlieren from short gap high voltage streamers representing lightning impulses. Scientific Reports 11 (1) , 24324. 10.1038/s41598-021-03839-y

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Abstract

Light emissions and Schlieren structures were simultaneously observed from streamers produced by tens of kilovolts 1.2/50 μs impulses, representing the high voltage component of lightning, applied across a 4 cm air gap between a variety of electrode geometries and a ground plane in an unconfned environment. The results demonstrated that the light emissions and Schlieren structures coincide along the same streamer flaments but on diferent timescales; the light existing only during the microsecond timeframe impulse whereas the Schlieren continued to develop into the millisecond timeframe, moving towards the centre of the air gap whilst difusing into the surrounding air within 100 ms. If an electrical breakdown did occur, the Schlieren structures outside the arc remained visible. Streamer formation theory for high voltage impulses is subsequently refned to include the observed Schlieren mechanism.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Additional Information:	This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made.
Publisher:	Nature Research
ISSN:	2045-2322
Date of First Compliant Deposit:	7 January 2022
Date of Acceptance:	6 December 2021
Last Modified:	09 May 2023 17:21
URI:	https://orca.cardiff.ac.uk/id/eprint/146437

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