{"id":5948,"date":"2017-06-06T12:40:29","date_gmt":"2017-06-06T12:40:29","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=5948"},"modified":"2023-06-28T12:43:20","modified_gmt":"2023-06-28T12:43:20","slug":"les-superbes-nuages-noctiluques-sont-de-retour","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/06\/06\/les-superbes-nuages-noctiluques-sont-de-retour\/","title":{"rendered":"Guettez les superbes nuages noctiluques"},"content":{"rendered":"

Chaque \u00e9t\u00e9, des nuages noctiluques de tr\u00e8s haute altitude font leur apparition apr\u00e8s le coucher du Soleil ou avant son lever.<\/strong><\/p>\n

Des nuages tr\u00e8s \u00e9lev\u00e9s :<\/h5>\n

Les nuages noctiluques (noctilucent clouds<\/em> ou NLC en anglais) ou nuages polaires m\u00e9sosph\u00e9riques se forment \u00e0 80 kilom\u00e8tres d\u2019altitude. Dans un environnement glac\u00e9 (-130\u00b0 C) la vapeur d\u2019eau se condense autour des poussi\u00e8res d\u2019\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 (le soir) ou des premiers \u00e0 l’aube. On les observe traditionnellement du d\u00e9but du mois de juin jusqu\u2019\u00e0 la mi-ao\u00fbt :<\/p>\n

\"\"<\/a>
Nuages noctiluques en Bourgogne \u00e0 l’aube du 4 juillet 2021. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n

Rep\u00e9r\u00e9s depuis 1885, les NLC apparaissent de plus en plus t\u00f4t. Les scientifiques ont remarqu\u00e9 que le ph\u00e9nom\u00e8ne s\u2019amplifie avec le r\u00e9chauffement climatique.<\/p>\n

Des NLC visibles \u00e9galement en France :<\/h5>\n

Ces curieux nuages, qui se forment en g\u00e9n\u00e9ral au-dessus des r\u00e9gions polaires, sont devenus visibles depuis quelques ann\u00e9es \u00e0 des latitudes beaucoup moins \u00e9lev\u00e9es. D\u00e9sormais, les photographes parviennent \u00e0 enregistrer ces draperies bleues en Allemagne, Pologne et parfois en France. Ce fut le cas pour ma part \u00e0 l’aube du 4 juillet 2021 (photo ci-dessus). Quelques semaines avant, ils s’\u00e9taient invit\u00e9s dans le ciel de Paris<\/a> :<\/p>\n

\"\"<\/a>
Les nuages noctiluques au-dessus de Paris le 18 juin 2021. \u00a9 Bertrand Kulik<\/a><\/figcaption><\/figure>\n

Si vous \u00eates l’heureux t\u00e9moin de ce spectacle, n’h\u00e9sitez pas \u00e0 faire des photographies en utilisant un objectif de courte focale. Posez plusieurs secondes avec une sensibilit\u00e9 \u00e9lev\u00e9e en ayant pris soin de fixer solidement votre bo\u00eetier photo sur un tr\u00e9pied. La saison 2023 des NLC a bien d\u00e9but\u00e9, comme le prouve ce superbe clich\u00e9 de Wil Cheung<\/a> :<\/p>\n

\"\"<\/a><\/p>\n

Suivez l\u2019actualit\u00e9 astronomique et d\u00e9couvrez mes images du ciel en vous abonnant \u00e0 Cielmania sur\u00a0Facebook<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Chaque \u00e9t\u00e9, des nuages noctiluques de tr\u00e8s haute altitude font leur apparition apr\u00e8s le coucher du Soleil ou avant son lever. Des nuages tr\u00e8s \u00e9lev\u00e9s : Les nuages noctiluques (noctilucent clouds ou NLC en anglais) ou nuages polaires m\u00e9sosph\u00e9riques se forment \u00e0 80 kilom\u00e8tres d\u2019altitude. Dans un environnement glac\u00e9 (-130\u00b0 C) la vapeur d\u2019eau se … Continuer la lecture de Guettez les superbes nuages noctiluques<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":14266,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"gallery","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[85],"tags":[1708,1707,1644,1066,1645],"class_list":["post-5948","post","type-post","status-publish","format-gallery","has-post-thumbnail","hentry","category-meteores","tag-nlc","tag-noctilucent-clouds","tag-nuage-noctiluque","tag-nuage-noctulescent","tag-nuage-polaire-mesospherique","post_format-post-format-gallery"],"yoast_head":"\nGuettez les superbes nuages noctiluques<\/title>\n<meta name=\"description\" content=\"Chaque \u00e9t\u00e9, des nuages noctiluques de tr\u00e8s haute altitude font leur apparition apr\u00e8s le coucher du Soleil ou avant son lever.\" \/>\n<meta name=\"robots\" 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