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Título: | Emerging and expanding streamer head in low-pressure air |
Autor: | Hoder, T.; Bonaventura, Z.; Prukner, V.; Gordillo Vázquez, Francisco J. CSIC ORCID ; Šimek, M | Palabras clave: | Streamer Electric field Low-pressure air Electron density Blue Jets Transient luminous events Ionisation wave |
Fecha de publicación: | 4-mar-2020 | Editor: | IOP Publishing | Citación: | Plasma Sources Science and Technology 29(3): 03LT01 (2020) | Resumen: | 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. | Versión del editor: | http://dx.doi.org/10.1088/1361-6595/ab7087 | URI: | http://hdl.handle.net/10261/220683 | DOI: | 10.1088/1361-6595/ab7087 | ISSN: | 0963-0252 |
Aparece en las colecciones: | (IAA) Artículos |
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IAA_2020PSST...29cLT01H.pdf | 1,57 MB | Adobe PDF | Visualizar/Abrir |
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