Submicrosecond Spectroscopy of Lightning-Like Discharges: Exploring New Time Regimes

DOI: 
10.1029/2020GL088755
Publication date: 
24/08/2020
Main author: 
Kieu N.
IAA authors: 
Kieu, N.;Gordillo-Vázquez, F.J.;Passas, M.;Sánchez, J.;Pérez-Invernón, F.J.;Luque, A.
Authors: 
Kieu N., Gordillo-Vázquez F.J., Passas M., Sánchez J., Pérez-Invernón F.J., Luque A., Montanyá J., Christian H.
Journal: 
Geophysical Research Letters
Refereed: 
Yes
Publication type: 
Article
Volume: 
47.0
Pages: 
e88755
Number: 
e2020GL088755
Abstract: 
Submicrosecond (0.476 μs per frame with an exposure time of 160 ns) high-resolution (0.38 nm) time-resolved spectra of laboratory-produced lightning-like electrical discharges have been recorded for the first time within the visible spectral range (645–665 nm). The spectra were recorded with the GrAnada LIghtning Ultrafast Spectrograph (GALIUS), a high-speed imaging spectrograph recently developed for lightning research in the IAA-CSIC. Unprecedented spectral time dynamics are explored for meter long laboratory electrical discharges produced with a 2.0 MV Marx generator. The maximum electron density and gas temperature measured in a timescale of ≤0.50 μs (160 ns) were, respectively, ≃1018 cm−3 and ≃32,000 K. Overpressure in the lightning-like plasma channel, black-body dynamics, and self-absorption in spectral lines were investigated. © 2020. The Authors.
Database: 
SCOPUS
ADS
URL: 
https://ui.adsabs.harvard.edu/#abs/2020GeoRL..4788755K/abstract
ADS Bibcode: 
2020GeoRL..4788755K
Keywords: 
discharges; high-speed; lightning; spectroscopy; temperature