{"id":7444,"date":"2017-03-08T13:23:27","date_gmt":"2017-03-08T13:23:27","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=7444"},"modified":"2017-03-14T07:03:25","modified_gmt":"2017-03-14T07:03:25","slug":"double-parhelie-halo-soleil-couchant","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/03\/08\/double-parhelie-halo-soleil-couchant\/","title":{"rendered":"Double parh\u00e9lie et halo pour un Soleil couchant"},"content":{"rendered":"

Parh\u00e9lie et halo solaires sont des photom\u00e9t\u00e9ores\u00a0 (du grec ph\u00f4t\u03ccs \u00ab lumi\u00e8re \u00bb et mete\u00f4ros \u00ab dans les airs \u00bb) qu’on observe dans un ciel voil\u00e9 par des cirrus.<\/strong><\/p>\n

C’est entre 7 et 12 km d\u2019altitude que l’on rencontre des nuages fins appel\u00e9s cirrus. Les gouttes d\u2019eau 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

\"\"<\/a><\/p>\n

Celui que l\u2019on observe sur cette image (volontairement contrast\u00e9e) forme un cercle\u00a0de 44\u00b0\u00a0centr\u00e9 sur le Soleil <\/a>; on parle d\u2019un halo de 22\u00b0 (son rayon) ou petit halo. Il est beaucoup plus rarement entour\u00e9 d\u2019un halo de 46\u00b0 (lui aussi centr\u00e9 sur le Soleil) appel\u00e9 \u00e9galement grand halo.<\/span><\/p>\n

Parfois, lorsque le Soleil est assez bas sur l\u2019horizon et qu\u2019il est voil\u00e9 par des cirrus, on distingue sur le petit halo une ou deux zones lumineuses dispos\u00e9es horizontalement de part et d\u2019autre de notre \u00e9toile : il s\u2019agit d\u2019un parh\u00e9lie. G\u00e9n\u00e9ralement\u00a0ces faux soleils (on les appelle aussi chiens du Soleil ou sundog<\/em> en anglais) sont peu color\u00e9s mais ils peuvent parfois prendre de magnifiques teintes comme ce spectaculaire parh\u00e9lie photographi\u00e9 en Allemagne<\/a>.<\/p>\n

Si vous aimez les photom\u00e9t\u00e9ores je vous invite \u00e0 consulter la galerie d\u2019images des ph\u00e9nom\u00e8nes lumineux atmosph\u00e9riques<\/a>\u00a0: vous y d\u00e9couvrirez une \u00e9tonnante vari\u00e9t\u00e9 de ph\u00e9nom\u00e8nes lumineux atmosph\u00e9riques associ\u00e9s \u00e0 la lumi\u00e8re solaire (et plus rarement lunaire) dont la beaut\u00e9 le dispute \u00e0 la raret\u00e9.<\/p>\n","protected":false},"excerpt":{"rendered":"

Parh\u00e9lie et halo solaires sont des photom\u00e9t\u00e9ores\u00a0 (du grec ph\u00f4t\u03ccs \u00ab lumi\u00e8re \u00bb et mete\u00f4ros \u00ab dans les airs \u00bb) qu’on observe dans un ciel voil\u00e9 par des cirrus. C’est entre 7 et 12 km d\u2019altitude que l’on rencontre des nuages fins appel\u00e9s cirrus. Les gouttes d\u2019eau qui les composent g\u00e8lent et se transforment en … Continuer la lecture de Double parh\u00e9lie et halo pour un Soleil couchant<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":7445,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[85],"tags":[2117,2116,1639,1218,97,1219],"class_list":["post-7444","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-meteores","tag-chien-du-soleil","tag-faux-soleil","tag-halo-solaire","tag-parhelie","tag-soleil","tag-sundog"],"yoast_head":"\nDouble parh\u00e9lie et halo pour un Soleil couchant<\/title>\n<meta name=\"description\" content=\"Parh\u00e9lie et halo solaires sont des photom\u00e9t\u00e9ores (du grec ph\u00f4t\u03ccs \u00ab lumi\u00e8re \u00bb et mete\u00f4ros \u00ab dans les airs \u00bb) qu'on observe dans un ciel voil\u00e9 par 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