{"id":6805,"date":"2016-12-06T16:22:07","date_gmt":"2016-12-06T16:22:07","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=6805"},"modified":"2022-06-22T15:56:09","modified_gmt":"2022-06-22T15:56:09","slug":"video-refraction-atmospherique-show","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/12\/06\/video-refraction-atmospherique-show\/","title":{"rendered":"En vid\u00e9o : la r\u00e9fraction atmosph\u00e9rique fait son show"},"content":{"rendered":"<p><strong>Le photographe Babak Tafreshi a film\u00e9 le coucher des \u00e9toiles, mettant en \u00e9vidence la d\u00e9viation de la lumi\u00e8re provoqu\u00e9e par la r\u00e9fraction atmosph\u00e9rique.<\/strong><\/p>\n<p>Lorsqu&#8217;ils sont proches de l&#8217;horizon, les rayons lumineux qui traversent l&#8217;atmosph\u00e8re terrestre voient leur trajectoire modifi\u00e9e en raison de la r\u00e9fraction atmosph\u00e9rique.<\/p>\n<p>Nous avons d\u00e9j\u00e0 tous observ\u00e9 un des effets de la r\u00e9fraction atmosph\u00e9rique avec les disques de la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/11\/16\/en-video-super-lune-leve-sur-baikonour\/\" target=\"_blank\" rel=\"noopener\">Lune <\/a>et du <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/11\/09\/coucher-de-soleil-derriere-lobservatoire-du-pic-du-midi\/\" target=\"_blank\" rel=\"noopener\">Soleil <\/a>l\u00e9g\u00e8rement aplatis ou fortement d\u00e9form\u00e9s au moment du lever et du coucher de ces astres. Mais ce ph\u00e9nom\u00e8ne optique, qui trouve son origine dans les variations de densit\u00e9 entre les diff\u00e9rentes couches d&#8217;air, s&#8217;observe aussi sur des sources lumineuses moins brillantes comme les \u00e9toiles.<\/p>\n\n<!-- iframe plugin v.5.1 wordpress.org\/plugins\/iframe\/ -->\n<iframe loading=\"lazy\" src=\"https:\/\/player.vimeo.com\/video\/188149183?portrait=0\" width=\"640\" height=\"360\" frameborder=\"0\" 0=\"webkitallowfullscreen\" 1=\"mozallowfullscreen\" 2=\"allowfullscreen&gt;&lt;\/iframe\" scrolling=\"yes\" class=\"iframe-class\"><\/iframe>\n\n<p>La r\u00e9fraction atmosph\u00e9rique \u00e9tant beaucoup plus importante \u00e0 l&#8217;horizon qu&#8217;au z\u00e9nith, les <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/14\/lumiere-rouge-les-astronomes\/\" target=\"_blank\" rel=\"noopener\">astronomes <\/a>choisissent toujours d&#8217;observer les astres lorsqu&#8217;ils sont au plus haut dans le ciel. <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/07\/06\/chili-photographes-plus-pres-etoiles\/\" target=\"_blank\" rel=\"noopener\">Babak Tafreshi<\/a> a fait le contraire.<!--more--><\/p>\n<p>Cet astrophotographe talentueux est le fondateur de <a href=\"http:\/\/twanight.org\/newTWAN\/\" target=\"_blank\" rel=\"noopener\">TWAN <\/a>(<em>The World At Night<\/em>) qui organise notamment le prestigieux concours <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/06\/13\/video-images-concours-earth-and-sky-2016\/\" target=\"_blank\" rel=\"noopener\"><em>International Earth and Sky Photo Contest<\/em><\/a>. Il est l&#8217;auteur de nombreuses et belles images, par exemple une vid\u00e9o du <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/13\/en-video-le-kilimanjaro-sous-les-etoiles\/\" target=\"_blank\" rel=\"noopener\">Kilimanjaro sous les \u00e9toiles<\/a> et une photographie des <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/06\/15\/penitents-de-glace-sous-les-etoiles-dans-le-desert-datacama\/\" target=\"_blank\" rel=\"noopener\">p\u00e9nitents de glace la nuit dans le d\u00e9sert d\u2019Atacama<\/a>.<\/p>\n<p>Il nous pr\u00e9sente cette fois une vid\u00e9o o\u00f9 l&#8217;on peut suivre le coucher des \u00e9toiles et du Soleil film\u00e9s depuis les observatoires situ\u00e9s dans le <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/12\/16\/pluie-de-geminides-dans-le-ciel-du-desert-datacama\/\" target=\"_blank\" rel=\"noopener\">d\u00e9sert d&#8217;Atacama<\/a> au Chili. On y d\u00e9couvre \u00e9galement un superbe lever de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/10\/21\/pleine-lune-lombre-mauna-kea\/\" target=\"_blank\" rel=\"noopener\">Pleine Lune<\/a> dans l&#8217;oc\u00e9an Atlantique visible depuis le littoral \u00e0 proximit\u00e9 de Boston. Ces images montrent qu&#8217;au plus pr\u00e8s de l&#8217;horizon les photons qui nous parviennent sont victimes de la r\u00e9fraction atmosph\u00e9rique. On observe une d\u00e9viation (traces d&#8217;\u00e9toiles irr\u00e9guli\u00e8res) et un rougissement de la lumi\u00e8re (c&#8217;est la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/11\/17\/non-lune-nest-blanche-a-lhorizon\/\" target=\"_blank\" rel=\"noopener\">diffusion Rayleigh<\/a>) ainsi que toutes sortes de mirages : <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/22\/rayon-vert-pour-le-solstice\/\" target=\"_blank\" rel=\"noopener\">rayon vert<\/a>, <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/08\/15\/dans-la-mer-le-soleil-est-encore-plus-beau\/\" target=\"_blank\" rel=\"noopener\">vase \u00e9trusque<\/a>&#8230;<\/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 photographe Babak Tafreshi a film\u00e9 le coucher des \u00e9toiles, mettant en \u00e9vidence la d\u00e9viation de la lumi\u00e8re provoqu\u00e9e par la r\u00e9fraction atmosph\u00e9rique. Lorsqu&#8217;ils sont proches de l&#8217;horizon, les rayons lumineux qui traversent l&#8217;atmosph\u00e8re terrestre voient leur trajectoire modifi\u00e9e en raison de la r\u00e9fraction atmosph\u00e9rique. Nous avons d\u00e9j\u00e0 tous observ\u00e9 un des effets de la &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/12\/06\/video-refraction-atmospherique-show\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">En vid\u00e9o : la r\u00e9fraction atmosph\u00e9rique fait son show<\/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":6806,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[87],"tags":[841,634,89,82,709,1176,97,1177],"class_list":["post-6805","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-hommes-et-le-ciel","tag-babak-tafreshi","tag-desert-datacama","tag-etoile","tag-lune","tag-rayon-vert","tag-refraction-atmospherique","tag-soleil","tag-vase-etrusque"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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