{"id":8443,"date":"2017-11-02T10:02:45","date_gmt":"2017-11-02T10:02:45","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=8443"},"modified":"2017-11-09T17:41:48","modified_gmt":"2017-11-09T17:41:48","slug":"deux-rares-paraselenes-tiennent-compagnie-a-lune","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/11\/02\/deux-rares-paraselenes-tiennent-compagnie-a-lune\/","title":{"rendered":"Deux rares paras\u00e9l\u00e8nes tiennent compagnie \u00e0 la Lune"},"content":{"rendered":"

Surprise au cours de la soir\u00e9e du premier novembre : la Lune gibbeuse \u00e9tait encadr\u00e9e par deux paras\u00e9l\u00e8nes, un ph\u00e9nom\u00e8ne peu courant.\u00a0<\/strong><\/p>\n

C’\u00e9tait une soir\u00e9e comme tant d’autres : j’\u00e9tais sorti pour faire des images de la Lune gibbeuse<\/a>\u00a0que je voulais immortaliser au-dessus d’un monument ou d’un b\u00e2timent. Un important voile de cirrus couvrait la plus grande partie du ciel, masquant presque toutes les \u00e9toiles. Un halo lunaire<\/a> se devinait : comme dans le cas d’un halo solaire, le halo lunaire se forme lorsque les rayons lumineux de l’astre traversent des cristaux de glace pr\u00e9sents dans l’atmosph\u00e8re. Typiquement ce sont des halos qui dessinent un cercle de 44\u00b0 centr\u00e9 sur l’astre.<\/p>\n

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

Soudain sont apparus deux paras\u00e9l\u00e8nes, connus sous le nom de chiens de garde de la Lune (qu’ils encadrent de part et d’autre) ou moondogs<\/em>.<\/p>\n

Les paras\u00e9l\u00e8nes sont l’\u00e9quivalent des parh\u00e9lies<\/a> qu’on observe parfois autour du Soleil : comme eux ils sont provoqu\u00e9s par la r\u00e9fraction des rayons lumineux (ceux de la Lune pour les paras\u00e9l\u00e8nes, du Soleil pour les parh\u00e9lies) au travers de cristaux de glace hexagonaux allong\u00e9s comme les tubes de stylos \u00e0 billes. Ce sont les nuages de haute altitude comme les cirrus qui contiennent de tels cristaux.<\/p>\n

Je n’ai eu le temps de faire que quelques images (bo\u00eetier Nikon D3200 et objectif Samyang de 8 mm, 20 secondes de pose \u00e0 800 iso) avant que ces paras\u00e9l\u00e8nes ne s’estompent. La photographie qui illustre cet article montre parfaitement ces chiens de garde plac\u00e9s de chaque c\u00f4t\u00e9 de la Lune sur un halo de 22\u00b0 que l’on devine. Pour d\u00e9couvrir d’autres ph\u00e9nom\u00e8nes lumineux atmosph\u00e9riques, allez voir cette galerie d’images<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Surprise au cours de la soir\u00e9e du premier novembre : la Lune gibbeuse \u00e9tait encadr\u00e9e par deux paras\u00e9l\u00e8nes, un ph\u00e9nom\u00e8ne peu courant.\u00a0 C’\u00e9tait une soir\u00e9e comme tant d’autres : j’\u00e9tais sorti pour faire des images de la Lune gibbeuse\u00a0que je voulais immortaliser au-dessus d’un monument ou d’un b\u00e2timent. Un important voile de cirrus couvrait la … Continuer la lecture de Deux rares paras\u00e9l\u00e8nes tiennent compagnie \u00e0 la Lune<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":8444,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[85],"tags":[2367,165,2366,2365,1218],"class_list":["post-8443","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-meteores","tag-chiens-de-garde-de-la-lune","tag-lune-gibbeuse","tag-moondogs","tag-paraselene","tag-parhelie"],"yoast_head":"\nDeux rares paras\u00e9l\u00e8nes tiennent compagnie \u00e0 la Lune<\/title>\n<meta name=\"description\" content=\"Surprise au cours de la soir\u00e9e du premier novembre : la Lune gibbeuse \u00e9tait encadr\u00e9e par deux paras\u00e9l\u00e8nes, un ph\u00e9nom\u00e8ne peu courant.\u00a0\" \/>\n<meta name=\"robots\" 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