Gigantic jets produced by an isolated tropical thunderstorm near Réunion Island

Abstract : Five gigantic jets (GJs) have been recorded with video and photograph cameras on 7 March 2010 above an isolated tropical storm east of Réunion Island. Three of them were produced before the storm reached its coldest cloud top temperature (approximately −81°C), and two others occurred during the cloud extension. Thanks to the close distance of observation (∼50 km), the luminosity within the cloud was recorded, and the events are analyzed in unprecedented detail. The tops of the GJs are estimated between 80 and 90 km. All these GJs are accompanied by long, continuous cloud illumination, and they are preceded and followed by intermittent optical flashes from the cloud, most of time without any cloud-to-ground (CG) flash simultaneously detected, which suggests they originated mainly as intracloud discharges and without any charge transfer to Earth. The CG lightning activity is observed to cease a few tens of seconds before the jets. According to ELF data recorded at Nagycenk, Hungary, the five GJs serve to raise negative charge. Their duration ranges from 333 to 850 ms. The leading jet has the most variable duration (33-167 ms) and propagates faster at higher altitudes. The trailing jet exhibits a continuous decrease of luminosity in different parts of the jet (lower channel, transition zone and, for most events, carrot sprite-like top) and in the cloud, with possible rebrightening. The lower channels (∼20-40 km altitude) produce blue luminosity which decreases with altitude and become more and more diffuse with time. The transition zone (around 40-65 km) consists of bright red, luminous beads slowly going up (∼104 m s−1), retracing the initial leading jet channels.
Type de document :
Article dans une revue
Journal of Geophysical Research: Atmospheres, American Geophysical Union, 2011, 116 (D19), pp.D19103. 〈10.1029/2010JD015581〉
Liste complète des métadonnées

Littérature citée [15 références]  Voir  Masquer  Télécharger

https://hal.archives-ouvertes.fr/hal-00961372
Contributeur : Nicolas Alarcon <>
Soumis le : mercredi 13 juin 2018 - 16:03:28
Dernière modification le : mardi 18 septembre 2018 - 01:24:01
Document(s) archivé(s) le : vendredi 14 septembre 2018 - 17:48:56

Fichier

Gigantic_jet_produced_isolated...
Fichiers éditeurs autorisés sur une archive ouverte

Identifiants

Collections

Citation

Serge Soula, Oscar Velde, Joan Montanya, Patrice Huet, Christelle Barthe, et al.. Gigantic jets produced by an isolated tropical thunderstorm near Réunion Island. Journal of Geophysical Research: Atmospheres, American Geophysical Union, 2011, 116 (D19), pp.D19103. 〈10.1029/2010JD015581〉. 〈hal-00961372〉

Partager

Métriques

Consultations de la notice

207

Téléchargements de fichiers

18