{"id":2903,"date":"2015-06-02T04:54:18","date_gmt":"2015-06-02T04:54:18","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=2903"},"modified":"2015-06-08T05:00:21","modified_gmt":"2015-06-08T05:00:21","slug":"les-nuages-noctulescents-sont-de-retour","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/06\/02\/les-nuages-noctulescents-sont-de-retour\/","title":{"rendered":"Les nuages noctulescents sont de retour"},"content":{"rendered":"<p><strong>Le mois de juin est la p\u00e9riode id\u00e9ale pour guetter les nuages noctulescents une fois la nuit tomb\u00e9e.<\/strong><\/p>\n<p>Comme leur nom l&#8217;indique, les nuages noctulescents (NLC pour <em>noctilucent clouds<\/em>) ou nuages polaires m\u00e9sosph\u00e9riques sont des nuages nocturnes lumineux. Compos\u00e9s de particules de glace, ils circulent dans la m\u00e9sosph\u00e8re \u00e0 80 km d&#8217;altitude alors que les plus hauts nuages que nous voyons dans la troposph\u00e8re ne d\u00e9passent pas 15 km d&#8217;altitude.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/05\/nuages_noctulescents.jpg\" rel=\"lightbox[2903]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-2904\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/05\/nuages_noctulescents-450x300.jpg\" alt=\"nuages_noctulescents\" width=\"450\" height=\"300\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/05\/nuages_noctulescents-450x300.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/05\/nuages_noctulescents.jpg 1000w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>C&#8217;est en raison de leur hauteur qu&#8217;on peut les observer quand la nuit est d\u00e9j\u00e0 install\u00e9e\u00a0: ils sont encore \u00e9clair\u00e9s par le <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/05\/11\/un-avion-de-ligne-passe-devant-le-soleil-tache\/\" target=\"_blank\">Soleil <\/a>bien que celui-ci soit sous l&#8217;horizon.<\/p>\n<p><!--more-->La meilleure p\u00e9riode d&#8217;observation des NLC dans l&#8217;h\u00e9misph\u00e8re nord se situe dans les semaines qui encadrent le <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/06\/21\/solstice-juin\/\" target=\"_blank\">solstice d&#8217;\u00e9t\u00e9<\/a>. De nombreux observateurs ont commenc\u00e9 \u00e0 traquer ces \u00e9tranges nuages, comme le photographe <a href=\"https:\/\/www.flickr.com\/photos\/glendaleskye\/\" target=\"_blank\">Andy Stables<\/a>\u00a0qui a r\u00e9alis\u00e9 l&#8217;image ci-dessus le 28 mai dernier en Ecosse avec une pose de 10 sec \u00e0 100 iso et un objectif ouvert \u00e0 2,8.<\/p>\n<p>Une \u00e9tude publi\u00e9e en 2014 dans le <em><a href=\"http:\/\/onlinelibrary.wiley.com\/doi\/10.1002\/2013JD021017\/abstract\" target=\"_blank\">Journal of Geophysical Research<\/a><\/em> a r\u00e9v\u00e9l\u00e9 une nette augmentation des nuages noctulescents d\u00e9tect\u00e9s depuis une d\u00e9cennie par les satellites charg\u00e9s d&#8217;\u00e9tudier l&#8217;atmosph\u00e8re terrestre comme <a href=\"http:\/\/aura.gsfc.nasa.gov\/\" target=\"_blank\">Aura <\/a>et <a href=\"https:\/\/earth.esa.int\/web\/guest\/missions\/3rd-party-missions\/current-missions\/odin\" target=\"_blank\">Odin<\/a>.<\/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 mois de juin est la p\u00e9riode id\u00e9ale pour guetter les nuages noctulescents une fois la nuit tomb\u00e9e. Comme leur nom l&#8217;indique, les nuages noctulescents (NLC pour noctilucent clouds) ou nuages polaires m\u00e9sosph\u00e9riques sont des nuages nocturnes lumineux. Compos\u00e9s de particules de glace, ils circulent dans la m\u00e9sosph\u00e8re \u00e0 80 km d&#8217;altitude alors que les &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/06\/02\/les-nuages-noctulescents-sont-de-retour\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Les nuages noctulescents 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":2904,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[85],"tags":[1069,125,711,1067,1066,216,1068],"class_list":["post-2903","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-meteores","tag-andy-stables","tag-atmosphere","tag-ecosse","tag-mesosphere","tag-nuage-noctulescent","tag-solstice","tag-troposphere"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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