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Emerging and expanding streamer head in low-pressure air

AuthorsHoder, T.; Bonaventura, Z.; Prukner, V.; Gordillo Vázquez, Francisco J. ; Šimek, M
Electric field
Low-pressure air
Electron density
Blue jet
Transient luminous events
Ionisation wave
Issue Date4-Mar-2020
PublisherIOP Publishing
CitationPlasma Sources Science and Technology 29(3): 03LT01 (2020)
AbstractThe 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.
Publisher version (URL)http://dx.doi.org/10.1088/1361-6595/ab7087
Appears in Collections:(IAA) Artículos
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