{"id":7223,"date":"2017-01-31T15:52:27","date_gmt":"2017-01-31T15:52:27","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=7223"},"modified":"2017-02-08T14:07:58","modified_gmt":"2017-02-08T14:07:58","slug":"spectaculaires-colonnes-lumineuses-nocturnes-aux-usa","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/01\/31\/spectaculaires-colonnes-lumineuses-nocturnes-aux-usa\/","title":{"rendered":"Spectaculaires colonnes lumineuses nocturnes aux USA"},"content":{"rendered":"<p><strong>Des colonnes lumineuses provoqu\u00e9es par des cristaux de glace ont illumin\u00e9 le ciel nocturne de la petite ville de Pinedale\u00a0dans l\u2019\u00c9tat du Wyoming.<\/strong><\/p>\n<p>On les appelle colonnes lumineuses ou piliers lumineux, <em>light pillars<\/em> en anglais. Il s&#8217;agit d&#8217;un <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/02\/22\/en-images-les-phenomenes-lumineux-atmospheriques\/\" target=\"_blank\">photom\u00e9t\u00e9ore<\/a>\u00a0(du grec <em>ph\u00f4t\u03ccs<\/em> \u00ab lumi\u00e8re \u00bb et <em>mete\u00f4ros<\/em> \u00ab dans les airs \u00bb), un de ces nombreux ph\u00e9nom\u00e8nes lumineux atmosph\u00e9riques qui viennent parfois illuminer la nuit, tout comme les <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/10\/26\/festival-aurores-polaires-apres-tempete-geomagnetique\/\" target=\"_blank\">aurores polaires<\/a>. Mais \u00e0 la diff\u00e9rence de ces derni\u00e8res qui naissent de l&#8217;interaction entre le vent solaire et la haute atmosph\u00e8re, c&#8217;est la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/06\/28\/pollution-lumineuse\/\" target=\"_blank\">pollution lumineuse<\/a> qui est \u00e0 l&#8217;origine des colonnes de lumi\u00e8re, ce qui explique pourquoi le ph\u00e9nom\u00e8ne n&#8217;est observ\u00e9 que depuis quelques d\u00e9cennies.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/01\/colonnes_lumiere.jpg\" rel=\"lightbox[7223]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-7224\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/01\/colonnes_lumiere-450x298.jpg\" alt=\"\" width=\"450\" height=\"298\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/01\/colonnes_lumiere-450x298.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/01\/colonnes_lumiere-768x509.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/01\/colonnes_lumiere-1024x678.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/01\/colonnes_lumiere.jpg 1359w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Quand le photographe <a href=\"http:\/\/www.davebellphotos.com\/\" target=\"_blank\">Dave Bell<\/a> a r\u00e9alis\u00e9 cette image le 24 janvier, la petite ville de Pinedale dans l\u2019\u00c9tat du Wyoming au NORD-OUEST des USA venait d&#8217;essuyer une s\u00e9v\u00e8re temp\u00eate de neige. \u00a0<!--more--><\/p>\n<p>Une fois la temp\u00eate termin\u00e9e il restait dans l&#8217;atmosph\u00e8re ce que les m\u00e9t\u00e9orologues surnomment un\u00a0poudrin de glace, une sorte de brouillard glac\u00e9 constitu\u00e9 de cristaux de glace extr\u00eamement fins de forme hexagonale qui parviennent \u00e0 se maintenir en suspension si l&#8217;atmosph\u00e8re est tr\u00e8s froide et stable.<\/p>\n<p>Chaque source lumineuse qui se trouve dessous (lampadaires, phares de voitures&#8230;) produit alors une colonne de lumi\u00e8re partant du sol et s&#8217;\u00e9tirant verticalement. Outre ces sources artificielles, la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/01\/26\/vieux-croissant-40-heures-nouvelle-lune\/\" target=\"_blank\">Lune<\/a> ou le <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/01\/21\/gregor-telescope-allemand-etudie-surface-soleil\/\" target=\"_blank\">Soleil<\/a> sur l&#8217;horizon peuvent parfois provoquer un pilier lumineux comme \u00e0 l&#8217;occasion de ce <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/01\/21\/festival-darcs-en-ciel-au-nouveau-mexique\/\" target=\"_blank\">festival d&#8217;arc-en-ciel au Nouveau-Mexique<\/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>Des colonnes lumineuses provoqu\u00e9es par des cristaux de glace ont illumin\u00e9 le ciel nocturne de la petite ville de Pinedale\u00a0dans l\u2019\u00c9tat du Wyoming. On les appelle colonnes lumineuses ou piliers lumineux, light pillars en anglais. Il s&#8217;agit d&#8217;un photom\u00e9t\u00e9ore\u00a0(du grec ph\u00f4t\u03ccs \u00ab lumi\u00e8re \u00bb et mete\u00f4ros \u00ab dans les airs \u00bb), un de ces nombreux &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/01\/31\/spectaculaires-colonnes-lumineuses-nocturnes-aux-usa\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Spectaculaires colonnes lumineuses nocturnes aux USA<\/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":7224,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[85],"tags":[2037,2040,2042,2038,520,2039,2041,167,2043],"class_list":["post-7223","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-meteores","tag-colonnes-lumineuses","tag-dave-bell","tag-etat-du-wyoming","tag-light-pillars","tag-photometeore","tag-piliers-lumineux","tag-pinedale","tag-pollution-lumineuse","tag-poudrin-de-glace"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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