{"id":7981,"date":"2017-06-15T05:09:57","date_gmt":"2017-06-15T05:09:57","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=7981"},"modified":"2017-06-26T05:07:25","modified_gmt":"2017-06-26T05:07:25","slug":"video-sprites-filmes-dessus-de-manche","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/06\/15\/video-sprites-filmes-dessus-de-manche\/","title":{"rendered":"En vid\u00e9o : des sprites film\u00e9s au-dessus de la Manche"},"content":{"rendered":"<p><strong>Un astrophotographe a film\u00e9 depuis l&#8217;un des sommets des Vosges des ph\u00e9nom\u00e8nes lumineux transitoires, les <em>sprites<\/em>, au cours d&#8217;orages sur la Manche.<\/strong><\/p>\n<p>On les appelle \u00a0ph\u00e9nom\u00e8nes lumineux transitoires (<em>Transient Luminous Event<\/em> ou TLE en anglais)\u00a0<em>sprites<\/em>, sylphes rouges ou encore farfadets : ce sont des \u00e9clairs qui se produisent dans la haute atmosph\u00e8re, souvent \u00e0 proximit\u00e9 des orages. Bien que leur existence ait \u00e9t\u00e9 pr\u00e9dite par le physicien \u00e9cossais C. T. R. Wilson dans les ann\u00e9es 1920, ils ont \u00e9t\u00e9 photographi\u00e9s pour la premi\u00e8re fois 70 ans plus tard.<\/p>\n\n<!-- iframe plugin v.5.1 wordpress.org\/plugins\/iframe\/ -->\n<iframe loading=\"lazy\" src=\"https:\/\/player.vimeo.com\/video\/221240479\" width=\"640\" height=\"360\" frameborder=\"0\" 0=\"webkitallowfullscreen\" 1=\"mozallowfullscreen\" 2=\"allowfullscreen&gt;&lt;\/iframe\" scrolling=\"yes\" class=\"iframe-class\"><\/iframe>\n\n<p>Les<em> sprites<\/em> apparaissent bri\u00e8vement sous la forme d\u2019\u00e9clairs verticaux rouges. Ils se forment au cours de l\u2019ionisation du diazote pr\u00e9sent dans une colonne atmosph\u00e9rique, \u00e0 la mani\u00e8re d\u2019un tube fluorescent.<!--more--><\/p>\n<p>La nuit du 28 au 29 mai dernier, l&#8217;astrophotographe <a href=\"http:\/\/nuitsacrees.fr\/\" target=\"_blank\" rel=\"noopener noreferrer\">St\u00e9phane Vetter<\/a> (bien connu pour ses superbes images nocturnes, notamment d&#8217;<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/05\/17\/en-video-les-aurores-islandaises-de-stephane-vetter\/\" target=\"_blank\" rel=\"noopener noreferrer\">aurores bor\u00e9ales<\/a>), \u00e9tait mont\u00e9 \u00e0 1.363 m d&#8217;altitude dans les Vosges au sommet du Hohneck alors que se d\u00e9roulait des <a href=\"http:\/\/www.keraunos.org\/recherche\/comprendre-les-orages-pedagogie-vulgarisation\/les-structures-orageuses\/orage-multicellulaire-multicellules.html\" target=\"_blank\" rel=\"noopener noreferrer\">orages multicellulaires<\/a> au-dessus de la Manche \u00e0 600 km de l\u00e0. \u00c9quip\u00e9 d&#8217;un bo\u00eetier ultrasensible Sony Alpha 7S, il a r\u00e9ussi \u00e0 filmer plus de 200 TLE qu&#8217;il a regroup\u00e9s dans la vid\u00e9o ci-dessus.<\/p>\n<p>Le film d\u00e9bute en d\u00e9but de nuit alors que le <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/29\/jeune-lune-agee-de-48-heures-soir-27-mai\/\" target=\"_blank\" rel=\"noopener noreferrer\">jeune croissant de Lune<\/a> (qui marque le <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/23\/debut-ramadan-attente-jeune-croissant\/\" target=\"_blank\" rel=\"noopener noreferrer\">d\u00e9but du Ramadan<\/a>) accompagn\u00e9 de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/09\/17\/en-video-un-saisissant-coucher-de-lumiere-cendree\/\" target=\"_blank\" rel=\"noopener noreferrer\">lumi\u00e8re cendr\u00e9e<\/a> descend sur l&#8217;horizon OUEST, puis les s\u00e9quences s&#8217;encha\u00eenent et couvrent une partie de la nuit avant que l&#8217;activit\u00e9 \u00e9lectrique ne faiblisse. Chaque s\u00e9quence est pr\u00e9sent\u00e9e \u00e0 vitesse r\u00e9elle (25 images\/sec) puis 5 fois moins vite pour bien visualiser les <em>sprites<\/em>.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Un astrophotographe a film\u00e9 depuis l&#8217;un des sommets des Vosges des ph\u00e9nom\u00e8nes lumineux transitoires, les sprites, au cours d&#8217;orages sur la Manche. On les appelle \u00a0ph\u00e9nom\u00e8nes lumineux transitoires (Transient Luminous Event ou TLE en anglais)\u00a0sprites, sylphes rouges ou encore farfadets : ce sont des \u00e9clairs qui se produisent dans la haute atmosph\u00e8re, souvent \u00e0 proximit\u00e9 &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/06\/15\/video-sprites-filmes-dessus-de-manche\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">En vid\u00e9o : des sprites film\u00e9s au-dessus de la Manche<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":7984,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[85],"tags":[246,1146,242,2252,1144,1027,1145],"class_list":["post-7981","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-meteores","tag-eclair","tag-farfadet","tag-orage","tag-phenomene-lumineux-transitoire","tag-sprites","tag-stephane-vetter","tag-sylphes"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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