{"id":20902,"date":"2025-02-24T10:55:32","date_gmt":"2025-02-24T10:55:32","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=20902"},"modified":"2025-03-12T13:37:49","modified_gmt":"2025-03-12T13:37:49","slug":"une-colonne-lumineuse-au-dessus-de-letna-en-eruption","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/02\/24\/une-colonne-lumineuse-au-dessus-de-letna-en-eruption\/","title":{"rendered":"Une colonne lumineuse au-dessus de l&#8217;Etna en \u00e9ruption"},"content":{"rendered":"<p style=\"text-align: right\"><strong>Les conditions sont parfois toutes r\u00e9unies pour r\u00e9aliser un clich\u00e9 exceptionnel. Exemple avec cette colonne lumineuse au-dessus de l\u2019Etna.<\/strong><!--more--><\/p>\n<h5>Recette glac\u00e9e :<\/h5>\n<p>La recette pour observer une colonne lumineuse\u00a0 est assez simple en th\u00e9orie. Il faut de la vapeur d\u2019eau \u00e0 tr\u00e8s basse temp\u00e9rature dans l\u2019atmosph\u00e8re pour obtenir ce que les m\u00e9t\u00e9orologues surnomment un poudrin de glace. Ce brouillard gel\u00e9 est 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. Chaque source lumineuse qui se trouve en dessous produit alors une colonne lumineuse verticale :<\/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[20902]\"><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\">Une colonne lumineuse se forme par r\u00e9flexion de la lumi\u00e8re sur des cristaux de glace hexagonaux en suspension dans l\u2019air glac\u00e9. \u00a9 Les Cowley<\/figcaption><\/figure>\n<p>En g\u00e9n\u00e9ral, on observe ces piliers quand il fait froid au-dessus des sources de lumi\u00e8re artificielles (lampadaires, phares de voiture\u2026). Parfois, c\u2019est le Soleil qui est \u00e0 l\u2019origine du pilier : on parle alors de\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/04\/17\/une-colonne-solaire-jaillit-des-monts-du-beaujolais\/\" target=\"_blank\" rel=\"noopener\">colonne solaire<\/a>. Mais cette fois, la source de lumi\u00e8re est beaucoup plus originale\u2026<!--more--><\/p>\n<h5>Une \u00e9ruption spectaculaire :<\/h5>\n<p>Le photographe <a href=\"https:\/\/www.instagram.com\/p\/DGJY953MbO5\/\" target=\"_blank\" rel=\"noopener\">Davide Cali\u00f2<\/a> a r\u00e9alis\u00e9 une \u00e9tonnante image de l\u2019Etna. De jour, mais surtout de nuit, le volcan sicilien offre des vues \u00e0 couper le souffle quand il entre en \u00e9ruption. Il est d\u2019ailleurs une source d\u2019inspiration pour de nombreux photographes, comme <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/06\/16\/en-sicile-la-pleine-lune-de-juin-au-dessus-de-letna-en-activite\/\" target=\"_blank\" rel=\"noopener\">Dario Giannobile<\/a>. Et c\u2019est le 15 f\u00e9vrier 2025 que Davide Cali\u00f2 a immortalis\u00e9 une colonne lumineuse :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/02\/pilier2.jpg\" rel=\"lightbox[20902]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-20904\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/02\/pilier2-360x450.jpg\" alt=\"\" width=\"360\" height=\"450\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/02\/pilier2-360x450.jpg 360w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/02\/pilier2.jpg 720w\" sizes=\"auto, (max-width: 360px) 100vw, 360px\" \/><\/a><\/p>\n<p>Au-dessus d&#8217;une bouche \u00e9ruptive, un pilier rouge\u00e2tre se d\u00e9tache au milieu des \u00e9toiles. Le ph\u00e9nom\u00e8ne est \u00e9galement expliqu\u00e9 sur le site <em><a href=\"https:\/\/atoptics.co.uk\/fza263.htm\" target=\"_blank\" rel=\"noopener\">Atoptics<\/a><\/em>.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/02\/20\/a-turin-letonnant-spectacle-dune-lune-ecarlate\/\" target=\"_blank\" rel=\"noopener\">\u00c0 Turin, l\u2019\u00e9tonnant spectacle d\u2019une Lune \u00e9carlate<\/a><\/li>\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\/2024\/07\/13\/festival-de-nuages-noctiluques-depuis-le-beaujolais\/\" target=\"_blank\" rel=\"noopener\">Festival de nuages noctiluques depuis le Beaujolais<\/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> et sur\u00a0<a href=\"https:\/\/bsky.app\/profile\/cielmania.bsky.social\" target=\"_blank\" rel=\"noopener\">Bluesky<\/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>Les conditions sont parfois toutes r\u00e9unies pour r\u00e9aliser un clich\u00e9 exceptionnel. Exemple avec cette colonne lumineuse au-dessus de l\u2019Etna.<!-- 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":20903,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[85],"tags":[3023,3733,18,19,3],"class_list":["post-20902","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-meteores","tag-colonne-lumineuse","tag-davide-calio","tag-etna","tag-sicile","tag-volcan"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Une colonne lumineuse au-dessus de l&#039;Etna en \u00e9ruption<\/title>\n<meta name=\"description\" content=\"Les conditions sont parfois toutes r\u00e9unies pour r\u00e9aliser un clich\u00e9 exceptionnel. 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