Emerging and expanding streamer head in low-pressure air

DOI: 
10.1088/1361-6595/ab7087
Publication date: 
02/06/2020
Main author: 
Hoder T.
IAA authors: 
Gordillo-Vázquez, F.J.
Authors: 
Hoder T., Bonaventura Z., Prukner V., Gordillo-Vázquez F.J., Šimek M.
Journal: 
Plasma Sources Science and Technology
Refereed: 
Yes
Publication type: 
Article
Volume: 
29.0
Pages: 
03LT01
Number: 
03LT01
Abstract: 
The emergence of a streamer from an ionisation wave and its expansion are ultra-fast processes shaping the very first moments of the streamer development, and are usually accessible only by complex numerical models. In this Letter, we report experimental evidence of the emergence of a streamer from an ionisation wave in 1.3 kPa air, a laboratory analogue of early-stage streamers emerging in geophysical Blue Starters and Jets. The radially and temporally resolved electric field patterns of an expanding streamer are determined by sub-nanosecond optical emission spectroscopy. As the emerged streamer expands, the electric field decreases by a factor of 1.4 in 1 ns. We quantify the radial expansion of the streamer head and its axial acceleration, reaching the velocity of 107 m s-1. In combination with electrical measurements, the transferred charge, electron density, and mean electron energy are quantified, enabling detailed insight into this ultra-fast phenomenon at its characteristic time-scale. © 2020 IOP Publishing Ltd.
Database: 
SCOPUS
ADS
URL: 
https://ui.adsabs.harvard.edu/#abs/2020PSST...29cLT01H/abstract
ADS Bibcode: 
2020PSST...29cLT01H
Keywords: 
blue jet; electric field; electron density; ionisation wave; low-pressure air; streamer; transient luminous events