{"id":1460,"date":"2014-12-22T07:29:46","date_gmt":"2014-12-22T07:29:46","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=1460"},"modified":"2015-01-01T09:13:54","modified_gmt":"2015-01-01T09:13:54","slug":"rayon-vert-pour-le-solstice","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/22\/rayon-vert-pour-le-solstice\/","title":{"rendered":"Rayon vert pour le solstice"},"content":{"rendered":"

Le 21 d\u00e9cembre, jour du solstice d’hiver<\/a>, le lever de Soleil<\/a> a \u00e9t\u00e9 pour moi l’occasion de saisir un fugitif rayon vert<\/a>.<\/p>\n

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

Comme pour tous les photom\u00e9t\u00e9ores (arc-en ciel<\/a>, arc circumz\u00e9nithal<\/a>, halo<\/a>\u00a0ou encore nuages iris\u00e9s<\/a>), c’est l’atmosph\u00e8re terrestre qui est responsable de l’apparition du rayon vert.<\/p>\n

Tr\u00e8s dense au niveau du sol, l’atmosph\u00e8re va d\u00e9composer la lumi\u00e8re (la r\u00e9fracter) \u00e0 la mani\u00e8re d’un prisme. Lorsque certaines conditions de transparence et d’humidit\u00e9 sont pr\u00e9sentes, le haut du Soleil <\/a>va s’ourler bri\u00e8vement d’un liser\u00e9 vert. Le ph\u00e9nom\u00e8ne est toujours tr\u00e8s rapide et en g\u00e9n\u00e9ral on le d\u00e9couvre ult\u00e9rieurement quand on visionne une s\u00e9quence de photographies.<\/p>\n

Sur cette image on remarque \u00e9galement la pr\u00e9sence de plusieurs taches solaires<\/a>, des anomalies magn\u00e9tiques moins chaudes (donc plus sombres) \u00e0 la surface de notre \u00e9toile. Je vous rappelle que\u00a0l\u2019observation et la photographie du Soleil ne sont possibles qu\u2019avec un filtre sp\u00e9cial. L\u2019image ci-dessus a \u00e9t\u00e9 r\u00e9alis\u00e9e avec un bo\u00eetier Finepix HS20 et son zoom de 720 mm de focale prot\u00e9g\u00e9 par un filtre ND 400.<\/p>\n

Le rayon vert a \u00e9t\u00e9 rendu c\u00e9l\u00e8bre par un roman de Jules Verne. Publi\u00e9 en 1882, ce r\u00e9cit relate les p\u00e9r\u00e9grinations d’un couple parti en Ecosse pour tenter d’observer ce curieux ph\u00e9nom\u00e8ne.<\/p>\n","protected":false},"excerpt":{"rendered":"

Le 21 d\u00e9cembre, jour du solstice d’hiver, le lever de Soleil a \u00e9t\u00e9 pour moi l’occasion de saisir un fugitif rayon vert. Comme pour tous les photom\u00e9t\u00e9ores (arc-en ciel, arc circumz\u00e9nithal, halo\u00a0ou encore nuages iris\u00e9s), c’est l’atmosph\u00e8re terrestre qui est responsable de l’apparition du rayon vert.<\/p>\n","protected":false},"author":8,"featured_media":1463,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[256,125,711,89,710,520,266,709,127,97,216,261],"class_list":["post-1460","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-anomalie-magnetique","tag-atmosphere","tag-ecosse","tag-etoile","tag-jules-verne","tag-photometeore","tag-prisme","tag-rayon-vert","tag-refraction","tag-soleil","tag-solstice","tag-tache-solaire"],"yoast_head":"\nRayon vert pour le solstice<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/22\/rayon-vert-pour-le-solstice\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Rayon vert pour le solstice\" \/>\n<meta property=\"og:description\" content=\"Le 21 d\u00e9cembre, jour du solstice d’hiver, le lever de Soleil a \u00e9t\u00e9 pour moi l’occasion de saisir un fugitif rayon vert. 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