{"id":11643,"date":"2020-02-21T04:33:34","date_gmt":"2020-02-21T04:33:34","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=11643"},"modified":"2020-03-08T18:59:18","modified_gmt":"2020-03-08T18:59:18","slug":"de-rares-aurores-boreales-bleues-photographiees-en-norvege","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/02\/21\/de-rares-aurores-boreales-bleues-photographiees-en-norvege\/","title":{"rendered":"De rares aurores bor\u00e9ales bleues photographi\u00e9es en Norv\u00e8ge"},"content":{"rendered":"

Toujours aussi belles et impr\u00e9visibles, des aurores bor\u00e9ales d’une rare couleur bleue sont apparues le 18 f\u00e9vrier au-dessus de la Norv\u00e8ge.<\/strong><\/p>\n

Paradis pour chasseur d’aurores :<\/h5>\n

L’archipel des \u00eeles Lofoten au nord de la Norv\u00e8ge est un endroit tr\u00e8s pris\u00e9 des astrophotographes. C’est l\u00e0 qu’ils viennent admirer les aurores bor\u00e9ales. Ces draperies qui ondulent dans le ciel trahissent l\u2019arriv\u00e9e de particules solaires \u00e9nerg\u00e9tiques. Ces derni\u00e8res, apr\u00e8s s\u2019\u00eatre fray\u00e9es un passage entre les lignes du champ magn\u00e9tique qui prot\u00e8ge notre plan\u00e8te, viennent ioniser la haute atmosph\u00e8re au niveau des p\u00f4les terrestres.<\/p>\n

\"\"<\/a>
Rares aurores bleues photographi\u00e9es le 18 f\u00e9vrier 2020 en Norv\u00e8ge. \u00a9 Matthew Steinberg<\/figcaption><\/figure>\n

Les aurores s\u2019observent depuis les r\u00e9gions polaires et seules les plus intenses peuvent devenir visibles \u00e0 de plus basses latitudes. On peut aussi observer des aurores australes (par exemple en Nouvelle-Z\u00e9lande<\/a>). Les astronomes en \u00e9tudient \u00e9galement sur d’autres plan\u00e8tes (voir ici sur Jupiter<\/a> ou Saturne<\/a>) et m\u00eame sur des naines brunes<\/a>.<\/p>\n

Spectacle rare :<\/h5>\n

Le 18 f\u00e9vrier Matthew Steinberg<\/a> a eu droit \u00e0 une \u00e9claircie apr\u00e8s une temp\u00eate de neige alors qu’il se trouvait \u00e0 Reine, port de p\u00eache entour\u00e9 de montagnes dans les \u00eeles Lofoten. \u00c0 sa grande surprise il a vu appara\u00eetre de belles aurores bleues, un ph\u00e9nom\u00e8ne plut\u00f4t rare. Les aurores, qui sont g\u00e9n\u00e9ralement vertes, correspondent \u00e0 l\u2019ionisation des mol\u00e9cules d\u2019oxyg\u00e8ne en dessous de 300 km d\u2019altitude alors que les aurores rouges se produisent 100 km plus haut. Le bleu, moins fr\u00e9quent et moins lumineux, trahit la pr\u00e9sence d’azote mol\u00e9culaire ionis\u00e9 \u00e0 tr\u00e8s haute altitude (plus de 400 km).<\/p>\n

\u00c0 savoir :<\/h5>\n

les aurores polaires ont donn\u00e9 lieu \u00e0 de nombreuses croyances, en particulier les aurores bor\u00e9ales qui ont une grande place dans la culture Inuit. On racontait par exemple aux enfants que les aurores pouvaient les emporter s\u2019ils restaient jouer dehors trop tard, que si l\u2019on sifflait tr\u00e8s fort on pouvait les faire danser ou encore que lorsque les aurores \u00e9taient tr\u00e8s nombreuses, les voyageurs qui se d\u00e9pla\u00e7aient la nuit en tra\u00eeneau devaient couper une oreille \u00e0 leurs chiens pour ne pas \u00eatre d\u00e9capit\u00e9s par les esprits du ciel\u00a0!<\/p>\n","protected":false},"excerpt":{"rendered":"

Toujours aussi belles et impr\u00e9visibles, des aurores bor\u00e9ales d’une rare couleur bleue sont apparues le 18 f\u00e9vrier au-dessus de la Norv\u00e8ge. Paradis pour chasseur d’aurores : L’archipel des \u00eeles Lofoten au nord de la Norv\u00e8ge est un endroit tr\u00e8s pris\u00e9 des astrophotographes. C’est l\u00e0 qu’ils viennent admirer les aurores bor\u00e9ales. Ces draperies qui ondulent dans … Continuer la lecture de De rares aurores bor\u00e9ales bleues photographi\u00e9es en Norv\u00e8ge<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":11644,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[395,2785,2786,1514],"class_list":["post-11643","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-aurore-boreale","tag-iles-lofoten","tag-matthew-steinberg","tag-norvege"],"yoast_head":"\nDe rares aurores bor\u00e9ales bleues photographi\u00e9es en Norv\u00e8ge<\/title>\n<meta name=\"description\" content=\"Toujours aussi belles et impr\u00e9visibles, des aurores bor\u00e9ales d'une rare couleur bleue sont apparues le 18 f\u00e9vrier au-dessus de la Norv\u00e8ge.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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