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1 Department of Electronic and Electrical Engineering 2 IAP - Institute of Atmospheric Physics Prague 3 Faculty of Mathematics and Physics Praha-Prague 4 DAM-DIF - DAM Île-de-France 5 Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Sopron 6 Bristol Industrial and Research Associates Ltd, Portishead, Bristol, UK 7 LPCE - Laboratoire de physique et chimie de l-environnement 8 NMT - New Mexico Institute of Mining and Technology New Mexico Tech 9 Italian Meteor and TLE Network, Ferrara, Italy 10 LGCGM - Laboratoire de Génie Civil et Génie Mécanique 11 Department of Meteorology Reading 12 LA - Laboratoire d-aérologie - LA 13 Electrical Engineering Departement 14 SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, UK 15 School of Physics and Astronomy, University of Glasgow, Glasgow, UK

Abstract : The acceleration of electrons results in observable electromagnetic waves which can be used for remote sensing. Here, we make use of ∼4 Hz–66 MHz radio waves emitted by two consecutive intense positive lightning discharges to investigate their impact on the atmosphere above a thundercloud. It is found that the first positive lightning discharge initiates a sprite where electrons are accelerated during the exponential growth and branching of the sprite streamers. This preconditioned plasma above the thundercloud is subsequently exposed to a second positive lightning discharge associated with a bouncing-wave discharge. This discharge process causes a re-brightening of the existing sprite streamers above the thundercloud and initiates a subsequent relativistic electron beam.

Keywords : atmospheric electricity lightning electromagnetic wave propagation storms





Autor: Martin Füllekrug - Ivana Kolmasova - Ondrej Santolik - Thomas Farges - József Bór - Alec Bennett - Michel Parrot - William Ris

Fuente: https://hal.archives-ouvertes.fr/



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