{"id":9323,"date":"2018-06-05T16:56:07","date_gmt":"2018-06-05T16:56:07","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=9323"},"modified":"2018-06-21T16:11:36","modified_gmt":"2018-06-21T16:11:36","slug":"saison-nuages-noctiluques-ouverte","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/06\/05\/saison-nuages-noctiluques-ouverte\/","title":{"rendered":"La saison des nuages noctiluques est ouverte"},"content":{"rendered":"<p><strong>Attendus chaque \u00e9t\u00e9, les nuages noctiluques sont de retour depuis le d\u00e9but du mois de juin. Pour le moment ils n&#8217;ont \u00e9t\u00e9 observ\u00e9s qu&#8217;\u00e0 de hautes latitudes.\u00a0\u00a0<\/strong><\/p>\n<p>Il se passe chaque \u00e9t\u00e9 quelque chose d\u2019\u00e9trange et de merveilleux dans le ciel au-dessus des p\u00f4les terrestres. Des nuages de tr\u00e8s haute altitude prennent une couleur d\u2019un bleu \u00e9lectrique alors que le\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/06\/26\/solarigraphe-revele-soleil-dun-solstice-a-lautre\/\" target=\"_blank\" rel=\"noopener\">Soleil\u00a0<\/a>est pass\u00e9 depuis longtemps sous l\u2019horizon.<\/p>\n\n<!-- iframe plugin v.5.1 wordpress.org\/plugins\/iframe\/ -->\n<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/ieKOQswnYQs\" frameborder=\"0\" allow=\"autoplay; encrypted-media\" 0=\"allowfullscreen&gt;&lt;\/iframe\" scrolling=\"yes\" class=\"iframe-class\"><\/iframe>\n\n<p>Les nuages noctiluques (<em>noctilucent clouds<\/em>\u00a0ou NLC en anglais) ou nuages polaires m\u00e9sosph\u00e9riques se forment \u00e0 80 km d\u2019altitude. Dans un environnement glac\u00e9 (-130\u00b0 C) des tra\u00een\u00e9es de vapeur d\u2019eau se condensent autour des poussi\u00e8res d\u2019<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/05\/12\/venus-letoile-filante-crepuscule\/\" target=\"_blank\" rel=\"noopener\">\u00e9toiles filantes<\/a> ou d\u2019\u00e9ruptions volcaniques pour former des cristaux de glace. Ce sont ces cristaux qui renvoient la lumi\u00e8re des derniers rayons solaires.\u00a0La vid\u00e9o ci-dessus nous montre l\u2019activit\u00e9 de ces nuages saisie en 2007 par le satellite am\u00e9ricain\u00a0<a href=\"http:\/\/www.nasa.gov\/mission_pages\/aim\/\" target=\"_blank\" rel=\"noopener\">AIM\u00a0<\/a>(<em>Aeronomy of Ice in the Mesosphere<\/em>). \u00a0<!--more--><span id=\"more-5739\"><\/span><\/p>\n<p>Traditionnellement les nuages noctiluques apparaissent d\u00e9but juin jusqu\u2019\u00e0 la mi-ao\u00fbt mais certaines ann\u00e9es ils sont plus pr\u00e9coces : en 2013, une ann\u00e9e exceptionnelle pour ces nuages lumineux, la premi\u00e8re d\u00e9tection avait eu lieu le 13 mai. Ceux visibles sur le clich\u00e9 ci-dessous ont \u00e9t\u00e9 photographi\u00e9s le 3 juin depuis le Danemark par\u00a0<a href=\"http:\/\/spaceweathergallery.com\/indiv_upload.php?upload_id=144985&amp;PHPSESSID=8bqsfm9pc7nv0unmia539l9906\" target=\"_blank\" rel=\"noopener\">Ruslan Merzlyakov<\/a> :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/06\/nlc.jpg\" rel=\"lightbox[9323]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-9324\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/06\/nlc-450x369.jpg\" alt=\"\" width=\"450\" height=\"369\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/06\/nlc-450x369.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/06\/nlc-768x631.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2018\/06\/nlc.jpg 1000w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Pourquoi de tels nuages apparaissent-ils (les premiers ont \u00e9t\u00e9 signal\u00e9s en 1885) et pourquoi de plus en plus t\u00f4t certaines ann\u00e9es ? Les scientifiques ont encore du mal \u00e0 r\u00e9pondre \u00e0 ces questions m\u00eame s\u2019ils ont remarqu\u00e9 que le ph\u00e9nom\u00e8ne s\u2019amplifie avec le r\u00e9chauffement climatique. Les <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/05\/10\/415\/\" target=\"_blank\" rel=\"noopener\">tra\u00een\u00e9es d&#8217;avions<\/a> ont peut-\u00eatre aussi leur part de responsabilit\u00e9.<\/p>\n<p>Pourra-t-on voir de tels nuages cet \u00e9t\u00e9 depuis la France\u00a0? C\u2019est assez difficile (puisqu\u2019ils se forment au-dessus des r\u00e9gions polaires) mais pas impossible\u00a0: chaque ann\u00e9e quelques photographes parviennent \u00e0 enregistrer ces draperies bleues au-dessus de notre pays. N&#8217;h\u00e9sitez pas \u00e0 aller admirer ces nuages dans la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/06\/06\/images-superbes-nuages-noctiluques\/\" target=\"_blank\" rel=\"noopener\">galerie d&#8217;images<\/a> qui leur est consacr\u00e9e.<\/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>Attendus chaque \u00e9t\u00e9, les nuages noctiluques sont de retour depuis le d\u00e9but du mois de juin. Pour le moment ils n&#8217;ont \u00e9t\u00e9 observ\u00e9s qu&#8217;\u00e0 de hautes latitudes.\u00a0\u00a0 Il se passe chaque \u00e9t\u00e9 quelque chose d\u2019\u00e9trange et de merveilleux dans le ciel au-dessus des p\u00f4les terrestres. Des nuages de tr\u00e8s haute altitude prennent une couleur d\u2019un &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/06\/05\/saison-nuages-noctiluques-ouverte\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">La saison des nuages noctiluques est ouverte<\/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":9325,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[1707,1644,2524],"class_list":["post-9323","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-noctilucent-clouds","tag-nuage-noctiluque","tag-ruslan-merzlyakov"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>La saison des nuages noctiluques est ouverte<\/title>\n<meta name=\"description\" content=\"Attendus chaque \u00e9t\u00e9, les nuages noctiluques sont de retour depuis le d\u00e9but du mois de juin. 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