{"id":5179,"date":"2016-03-03T17:46:32","date_gmt":"2016-03-03T17:46:32","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=5179"},"modified":"2016-03-13T09:36:09","modified_gmt":"2016-03-13T09:36:09","slug":"curiosite-un-mirage-lunaire-sur-locean-arctique","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/03\/03\/curiosite-un-mirage-lunaire-sur-locean-arctique\/","title":{"rendered":"Curiosit\u00e9 : un mirage lunaire sur l’oc\u00e9an Arctique"},"content":{"rendered":"

Le 23 f\u00e9vrier un photographe install\u00e9 dans le Grand Nord canadien a saisi un spectaculaire mirage lunaire lors du lever de la Pleine Lune des neiges.<\/strong><\/p>\n

Alert est le nom d’une base militaire canadienne situ\u00e9e dans le territoire du Nunavut, dans l’Arctique canadien. C’est aussi le lieu habit\u00e9 le plus septentrional de la plan\u00e8te \u00e0 seulement 817 km du p\u00f4le Nord, \u00e0 l’extr\u00eame nord de l’\u00eele d’Ellesmere. Outre la base militaire, le site compte \u00e9galement une station du service m\u00e9t\u00e9orologique canadien membre du GAW (Global Atmosphere Watch<\/em><\/a>), un service qui recueille les donn\u00e9es m\u00e9t\u00e9orologiques en provenance de nombreuses stations r\u00e9parties sur la plan\u00e8te.<\/p>\n

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

C’est depuis la station d’Alert que Kevin Rawlings a photographi\u00e9 le 23 f\u00e9vrier le lever de la Pleine Lune des neiges<\/a>. Pourquoi la Lune a-t-elle cet \u00e9trange aspect\u00a0?<\/p>\n

Normalement la temp\u00e9rature de l’air diminue avec l’altitude, mais comme le raconte le photographe sur EarthSky<\/em><\/a>, une couche d’inversion thermique \u00e9tait pr\u00e9sente, puisque la station avait enregistr\u00e9 -26 \u00b0 C au niveau du sol et -4 \u00b0 C \u00e0 700 m d’altitude.<\/p>\n

C’est cette couche d’inversion qui est \u00e0 l’origine de la distorsion du disque lunaire, un ph\u00e9nom\u00e8ne comparable \u00e0 celui qu’on observe dans le cas d’un mirage solaire<\/a> et qui vient agrandir l’\u00e9tonnante famille des ph\u00e9nom\u00e8nes lumineux atmosph\u00e9riques<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Le 23 f\u00e9vrier un photographe install\u00e9 dans le Grand Nord canadien a saisi un spectaculaire mirage lunaire lors du lever de la Pleine Lune des neiges. Alert est le nom d’une base militaire canadienne situ\u00e9e dans le territoire du Nunavut, dans l’Arctique canadien. C’est aussi le lieu habit\u00e9 le plus septentrional de la plan\u00e8te \u00e0 … Continuer la lecture de Curiosit\u00e9 : un mirage lunaire sur l’oc\u00e9an Arctique<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":5180,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[85],"tags":[1542,1537,1538,1541,1539,1536,1543,1540,1517],"class_list":["post-5179","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-meteores","tag-alert","tag-couche-dinversion","tag-earthsky","tag-gaw","tag-kevin-rawlings","tag-mirage-lunaire","tag-nuvanut","tag-ocean-arctique","tag-pleine-lune-des-neiges"],"yoast_head":"\nCuriosit\u00e9 : un mirage lunaire sur l'oc\u00e9an Arctique<\/title>\n<meta name=\"description\" content=\"Le 23 f\u00e9vrier un photographe install\u00e9 dans le Grand Nord canadien a saisi un spectaculaire 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