{"id":18971,"date":"2024-02-05T17:17:12","date_gmt":"2024-02-05T17:17:12","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=18971"},"modified":"2024-02-23T17:15:50","modified_gmt":"2024-02-23T17:15:50","slug":"detonnants-piliers-lumineux-photographies-en-alaska","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/02\/05\/detonnants-piliers-lumineux-photographies-en-alaska\/","title":{"rendered":"D&#8217;\u00e9tonnants piliers lumineux photographi\u00e9s en Alaska"},"content":{"rendered":"<p><strong>Au-dessus d&#8217;Anchorage, la plus grande ville d\u2019Alaska, des piliers lumineux produits par des cristaux de glace ont fait leur apparition.<\/strong><\/p>\n<h5>Un ph\u00e9nom\u00e8ne r\u00e9cent :<\/h5>\n<p>En Alaska, il n&#8217;y a pas que les <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/10\/26\/festival-aurores-polaires-apres-tempete-geomagnetique\/\" target=\"_blank\" rel=\"noopener\">aurores polaires<\/a> qui illuminent la nuit. L\u2019astrophotographe Todd Salat (<a href=\"https:\/\/www.aurorahunter.com\/\" target=\"_blank\" rel=\"noopener\">Aurora Hunter<\/a>) a photographi\u00e9 des piliers lumineux. Comme ils se produisent dans l&#8217;atmosph\u00e8re, ces &#8220;<em>light pillars&#8221;<\/em> font partie de la famille des <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/02\/22\/en-images-les-phenomenes-lumineux-atmospheriques\/\" target=\"_blank\" rel=\"noopener\">photom\u00e9t\u00e9ores<\/a> (du grec <em>ph\u00f4t\u03ccs<\/em>\u00a0\u00ab lumi\u00e8re \u00bb et\u00a0<em>mete\u00f4ros<\/em> \u00ab dans les airs \u00bb) :<\/p>\n\n<!-- iframe plugin v.5.1 wordpress.org\/plugins\/iframe\/ -->\n<iframe loading=\"lazy\" src=\"https:\/\/www.facebook.com\/plugins\/post.php?href=https%3A%2F%2Fwww.facebook.com%2FAuroraHunter%2Fposts%2Fpfbid0EyriB8RE9PALopifzQou7tKNcowwE4E1JX7c95BTtfqnXyVvJBXTC4FVm553xc4sl&#038;show_text=true&#038;width=500\" width=\"500\" height=\"540\" style=\"border:none;overflow:hidden\" scrolling=\"no\" frameborder=\"0\" allowfullscreen=\"true\" allow=\"autoplay; clipboard-write; encrypted-media; picture-in-picture; web-share\" class=\"iframe-class\"><\/iframe>\n\n<p>\u00c0\u00a0la diff\u00e9rence des aurores bor\u00e9ales qui naissent de l\u2019interaction entre le vent solaire et la haute atmosph\u00e8re, c\u2019est la <a href=\"https:\/\/www.futura-sciences.com\/sciences\/questions-reponses\/espace-quest-ce-pollution-lumineuse-12\/\" target=\"_blank\" rel=\"noopener\">pollution lumineuse<\/a> qui est \u00e0 l\u2019origine de ces piliers. C\u2019est pour cette raison qu\u2019on observe ce ph\u00e9nom\u00e8ne seulement depuis quelques d\u00e9cennies.<!--more--><\/p>\n<h5>Recette glac\u00e9e :<\/h5>\n<p>La recette pour observer des piliers de lumi\u00e8re\u00a0 est assez simple en th\u00e9orie. Il faut d\u2019abord une belle temp\u00eate de neige. Une fois qu\u2019elle est termin\u00e9e, il reste dans l\u2019atmosph\u00e8re ce que les m\u00e9t\u00e9orologues surnomment un poudrin de glace. C\u2019est une sorte de brouillard constitu\u00e9 de cristaux de glace extr\u00eamement fins de forme hexagonale. Ils parviennent \u00e0 se maintenir en suspension si l\u2019atmosph\u00e8re est tr\u00e8s froide et stable :<\/p>\n<figure id=\"attachment_15366\" aria-describedby=\"caption-attachment-15366\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/pilier3.jpg\" rel=\"lightbox[18971]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15366\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/pilier3-450x305.jpg\" alt=\"\" width=\"450\" height=\"305\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/pilier3-450x305.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/pilier3-768x520.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/pilier3.jpg 1024w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-15366\" class=\"wp-caption-text\">Les piliers lumineux se forment par r\u00e9flexion de lumi\u00e8res artificielles sur des cristaux de glace hexagonaux en suspension dans l\u2019air glac\u00e9. \u00a9 Les Cowley<\/figcaption><\/figure>\n<p>Chaque source lumineuse qui se trouve plus bas (lampadaires, phares de voitures\u2026) produit alors une colonne de lumi\u00e8re partant du sol et s\u2019\u00e9tirant verticalement.<\/p>\n<p><span style=\"font-size: 18px;font-weight: bold;color: #2b2b2b\">Vous pourriez aimer :<\/span><\/p>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/07\/11\/un-pilote-de-ligne-filme-la-danse-des-aurores-boreales\/\" target=\"_blank\" rel=\"noopener\">Un pilote de ligne filme la danse des aurores bor\u00e9ales<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/07\/04\/des-nuages-noctiluques-se-dessinent-dans-le-ciel-bourguignon\/\" target=\"_blank\" rel=\"noopener\">Des nuages noctiluques se dessinent juste avant l\u2019aube<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/06\/14\/aurore-australe-au-dessus-de-la-base-scientifique-concordia\/\" target=\"_blank\" rel=\"noopener\">Aurore australe au-dessus de la base scientifique Concordia<\/a><\/li>\n<\/ul>\n<p>Suivez l\u2019actualit\u00e9 astronomique et d\u00e9couvrez mes images du ciel en vous abonnant \u00e0 Cielmania sur\u00a0<a href=\"https:\/\/www.facebook.com\/cielmania\/\" target=\"_blank\" rel=\"noopener noreferrer\">Facebook<\/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>Au-dessus d&#8217;Anchorage, la plus grande ville d\u2019Alaska, des piliers lumineux produits par des cristaux de glace ont fait leur apparition. Un ph\u00e9nom\u00e8ne r\u00e9cent : En Alaska, il n&#8217;y a pas que les aurores polaires qui illuminent la nuit. L\u2019astrophotographe Todd Salat (Aurora Hunter) a photographi\u00e9 des piliers lumineux. Comme ils se produisent dans l&#8217;atmosph\u00e8re, ces &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/02\/05\/detonnants-piliers-lumineux-photographies-en-alaska\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">D&#8217;\u00e9tonnants piliers lumineux photographi\u00e9s en Alaska<\/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":18972,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[85],"tags":[911,3156,2039,3157],"class_list":["post-18971","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-meteores","tag-alaska","tag-anchorage","tag-piliers-lumineux","tag-todd-salat"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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