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
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.
URL:
https://ui.adsabs.harvard.edu/#abs/2020GeoRL..4788755K/abstract
Keywords:
discharges; high-speed; lightning; spectroscopy; temperature