{"id":5702,"date":"2016-06-15T14:25:04","date_gmt":"2016-06-15T14:25:04","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=5702"},"modified":"2017-03-03T15:56:09","modified_gmt":"2017-03-03T15:56:09","slug":"se-forme-halo-autour-soleil","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/06\/15\/se-forme-halo-autour-soleil\/","title":{"rendered":"Comment se forme un halo autour du Soleil ?"},"content":{"rendered":"<p><strong>Photom\u00e9t\u00e9ore assez fr\u00e9quent, le halo solaire (du grec ph\u00f4t\u03ccs \u00ab lumi\u00e8re \u00bb et mete\u00f4ros \u00ab dans les airs \u00bb) demande de la lumi\u00e8re et des cristaux de glace.\u00a0<\/strong><\/p>\n<p>Entre 7 et 12 km d&#8217;altitude on rencontre des nuages fins appel\u00e9s cirrus. Les gouttes d&#8217;eau qui les composent g\u00e8lent et se transforment en petits cristaux de glace en g\u00e9n\u00e9ral de forme hexagonale. En traversant ces cristaux les rayons solaires subissent plusieurs r\u00e9flexions et ressortent selon certains angles, produisant ainsi des halos solaires.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/05\/rap8-1.jpg\" rel=\"lightbox[5702]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-5773\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/05\/rap8-1-450x299.jpg\" alt=\"rap8\" width=\"450\" height=\"299\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/05\/rap8-1-450x299.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/05\/rap8-1-768x510.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/05\/rap8-1-1024x681.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/05\/rap8-1.jpg 1354w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Celui que l&#8217;on observe sur cette image r\u00e9alis\u00e9e pendant les <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/05\/08\/rap-2016-retour-belle-manifestation\/\" target=\"_blank\">Rencontres Astronomiques de Printemps<\/a>\u00a0(voir au bas de l&#8217;article) forme un cercle\u00a0de 44\u00b0\u00a0centr\u00e9 sur le <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/03\/09\/en-video-leclipse-totale-de-soleil-du-9-mars-2016\/\" target=\"_blank\">Soleil <\/a>; on parle d&#8217;un halo de 22\u00b0 (son rayon) ou petit halo. Il est beaucoup plus rarement accompagn\u00e9 d&#8217;un halo de 46\u00b0 (lui aussi centr\u00e9 sur le Soleil) appel\u00e9 \u00e9galement grand halo.<!--more--><\/p>\n<p>Parfois, lorsque le Soleil est assez bas sur l&#8217;horizon et qu&#8217;il est voil\u00e9 par des cirrus, le petit halo est incomplet et ne laisse voir que\u00a0deux zones lumineuses dispos\u00e9es horizontalement de part et d&#8217;autre de notre \u00e9toile : il s&#8217;agit d&#8217;un parh\u00e9lie. G\u00e9n\u00e9ralement\u00a0ces faux soleils (on les appelle aussi chiens du Soleil ou <em>sundog<\/em> en anglais) sont peu color\u00e9s mais ils peuvent parfois prendre de magnifiques teintes comme ce <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/09\/05\/un-spectaculaire-parhelie-photographie-en-allemagne\/\" target=\"_blank\">spectaculaire parh\u00e9lie photographi\u00e9 en Allemagne<\/a>.<\/p>\n<p>Si vous aimez les photom\u00e9t\u00e9ores je vous invite \u00e0 consulter la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/02\/22\/en-images-les-phenomenes-lumineux-atmospheriques\/\" target=\"_blank\">galerie d&#8217;images des ph\u00e9nom\u00e8nes lumineux atmosph\u00e9riques<\/a>.<\/p>\n\n<!-- iframe plugin v.5.1 wordpress.org\/plugins\/iframe\/ -->\n<iframe loading=\"lazy\" src=\"https:\/\/player.vimeo.com\/video\/165826110\" width=\"640\" height=\"480\" frameborder=\"0\" 0=\"webkitallowfullscreen\" 1=\"mozallowfullscreen\" 2=\"allowfullscreen&gt;&lt;\/iframe\" scrolling=\"yes\" class=\"iframe-class\"><\/iframe>\n\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Photom\u00e9t\u00e9ore assez fr\u00e9quent, le halo solaire (du grec ph\u00f4t\u03ccs \u00ab lumi\u00e8re \u00bb et mete\u00f4ros \u00ab dans les airs \u00bb) demande de la lumi\u00e8re et des cristaux de glace.\u00a0 Entre 7 et 12 km d&#8217;altitude on rencontre des nuages fins appel\u00e9s cirrus. Les gouttes d&#8217;eau qui les composent g\u00e8lent et se transforment en petits cristaux de &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/06\/15\/se-forme-halo-autour-soleil\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Comment se forme un halo autour du Soleil ?<\/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":5773,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[85],"tags":[519,1639,520,1024,1219],"class_list":["post-5702","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-meteores","tag-cirrus","tag-halo-solaire","tag-photometeore","tag-rencontres-astronomiques-de-printemps","tag-sundog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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