HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

Optical emissions associated with energetic electrons produced by stepping leaders in cloud-to-ground lightning discharges

Abstract : Both natural cloud-to-ground and rocket-triggered lightning flashes have been found to be associated with intense and brief bursts of X-ray emissions. Using a full energy Monte Carlo model combined with an optical emission model, we quantify the optical emissions induced by the strong acceleration of thermal runaway electrons in the highly inhomogeneous electric field produced by stepping lightning leaders. The results demonstrate that this acceleration process is accompanied with not only high-energy X-ray emissions but also detectable levels of optical emissions. The fluorescence beam exhibits a conical shape and appears to be larger than the streamer zone associated with the lightning leader. Moreover, we emphasize that the size of the fluorescence beam largely depends on the electrical properties of the associated lightning leader and the intensity ratio between emissions from the second positive band system of N 2 and the first negative band system of N + 2 reflects the intrinsic difference in the energetics of electrons involved. Therefore, corresponding measurements compared to modeling results can provide useful information for understanding of the stepping mechanism of lightning leaders and associated X-ray production processes.
Document type :
Journal articles
Complete list of metadata

Cited literature [27 references]  Display  Hide  Download

Contributor : Nathalie Pothier Connect in order to contact the contributor
Submitted on : Friday, December 18, 2015 - 11:21:50 AM
Last modification on : Tuesday, May 10, 2022 - 3:24:56 PM
Long-term archiving on: : Saturday, April 29, 2017 - 9:14:29 PM


Publisher files allowed on an open archive




Wei Xu, Sébastien Celestin, Victor Pasko. Optical emissions associated with energetic electrons produced by stepping leaders in cloud-to-ground lightning discharges. Geophysical Research Letters, American Geophysical Union, 2015, 42, pp.5610-5616. ⟨10.1002/2015GL064419⟩. ⟨insu-01246199⟩



Record views


Files downloads