{"id":5739,"date":"2016-05-16T08:20:22","date_gmt":"2016-05-16T08:20:22","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=5739"},"modified":"2016-05-24T14:46:32","modified_gmt":"2016-05-24T14:46:32","slug":"premiers-nuages-noctiluques-de-retour","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/05\/16\/premiers-nuages-noctiluques-de-retour\/","title":{"rendered":"Les premiers nuages noctiluques sont de retour"},"content":{"rendered":"<p><strong>Le 10 mai ont \u00e9t\u00e9 photographi\u00e9s les premiers nuages noctiluques. Une apparition tr\u00e8s pr\u00e9coce pour ces nuages nocturnes lumineux attendus en \u00e9t\u00e9.<\/strong><\/p>\n<p>Il se passe chaque \u00e9t\u00e9 quelque chose d&#8217;\u00e9trange et de merveilleux dans le ciel au-dessus des p\u00f4les terrestres. Des nuages de tr\u00e8s haute altitude prennent une couleur d&#8217;un bleu \u00e9lectrique alors que le <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/03\/09\/en-video-leclipse-totale-de-soleil-du-9-mars-2016\/\" target=\"_blank\">Soleil <\/a>est pass\u00e9 depuis longtemps sous l&#8217;horizon.<\/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\" 0=\"allowfullscreen&gt;&lt;\/iframe\" scrolling=\"yes\" class=\"iframe-class\"><\/iframe>\n\n<p>Les nuages noctiluques (<em>noctilucent clouds<\/em> ou NLC en anglais) ou nuages polaires m\u00e9sosph\u00e9riques se forment \u00e0 80 km d&#8217;altitude. Dans un environnement glac\u00e9 (-130\u00b0 C) la vapeur d&#8217;eau se condense autour des poussi\u00e8res d&#8217;\u00e9toiles filantes ou d&#8217;\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&#8217;activit\u00e9 de ces nuages noctulescents saisie en 2007 par le satellite am\u00e9ricain <a href=\"http:\/\/www.nasa.gov\/mission_pages\/aim\/\" target=\"_blank\">AIM <\/a>(<em>Aeronomy of Ice in the Mesosphere<\/em>). \u00a0<!--more--><\/p>\n<p>Traditionnellement les nuages noctiluques apparaissent d\u00e9but juin jusqu&#8217;\u00e0 la mi-ao\u00fbt mais il y a quelques jours, le 10 mai exactement, le photographe <a href=\"https:\/\/www.flickr.com\/photos\/glendaleskye\/26336836664\/\" target=\"_blank\">Andy Stables<\/a> a immortalis\u00e9 ce ph\u00e9nom\u00e8ne depuis l&#8217;\u00eele \u00e9cossaise de Skye. En 2013, une ann\u00e9e exceptionnelle pour ces nuages lumineux, la premi\u00e8re d\u00e9tection avait eu lieu le 13 mai.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/05\/noctiluque2.jpg\"  rel=\"lightbox[5739] attachment wp-att-5743\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-5743\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/05\/noctiluque2-450x272.jpg\" alt=\"noctiluque2\" width=\"450\" height=\"272\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/05\/noctiluque2-450x272.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/05\/noctiluque2-768x465.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/05\/noctiluque2-1024x619.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/05\/noctiluque2.jpg 1458w\" 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\u00a0? Les scientifiques ont encore du mal \u00e0 r\u00e9pondre \u00e0 ces questions m\u00eame s&#8217;ils ont remarqu\u00e9 que le ph\u00e9nom\u00e8ne s&#8217;amplifie avec le r\u00e9chauffement climatique.<\/p>\n<p>Pourra-t-on voir de tels nuages cet \u00e9t\u00e9 depuis la France\u00a0? C&#8217;est assez difficile (puisqu&#8217;ils 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.<\/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>Le 10 mai ont \u00e9t\u00e9 photographi\u00e9s les premiers nuages noctiluques. Une apparition tr\u00e8s pr\u00e9coce pour ces nuages nocturnes lumineux attendus en \u00e9t\u00e9. Il se passe chaque \u00e9t\u00e9 quelque chose d&#8217;\u00e9trange et de merveilleux dans le ciel au-dessus des p\u00f4les terrestres. Des nuages de tr\u00e8s haute altitude prennent une couleur d&#8217;un bleu \u00e9lectrique alors que le &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/05\/16\/premiers-nuages-noctiluques-de-retour\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Les premiers nuages noctiluques sont de retour<\/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":5742,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[85],"tags":[1646,1069,1644,1066,1645,1647],"class_list":["post-5739","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-meteores","tag-aim","tag-andy-stables","tag-nuage-noctiluque","tag-nuage-noctulescent","tag-nuage-polaire-mesospherique","tag-skye"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Les premiers nuages noctiluques sont de retour<\/title>\n<meta name=\"description\" content=\"Le 10 mai ont \u00e9t\u00e9 photographi\u00e9s les premiers nuages noctiluques. 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