{"id":2933,"date":"2015-06-06T05:14:25","date_gmt":"2015-06-06T05:14:25","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=2933"},"modified":"2015-06-14T07:06:33","modified_gmt":"2015-06-14T07:06:33","slug":"des-aurores-illuminent-aussi-les-poles-de-saturne","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/06\/06\/des-aurores-illuminent-aussi-les-poles-de-saturne\/","title":{"rendered":"Des aurores illuminent aussi les p\u00f4les de Saturne"},"content":{"rendered":"

L’atmosph\u00e8re terrestre n’est pas la seule \u00e0 conna\u00eetre des aurores polaires. Les particules \u00e9nerg\u00e9tiques solaires marquent aussi de leur passage la magn\u00e9tosph\u00e8re de Saturne.<\/strong><\/p>\n

De nombreux astrophotographes font le voyage en Alaska <\/a>ou en Islande <\/a>pour y admirer les aurores polaires. L\u00e0, \u00e0 proximit\u00e9 du p\u00f4le magn\u00e9tique, l\u2019interaction entre le vent solaire et la haute atmosph\u00e8re terrestre illumine le ciel nocturne de somptueuses draperies vertes.<\/p>\n

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

Un ph\u00e9nom\u00e8ne que les astronomes traquent d\u00e9sormais ailleurs dans le Syst\u00e8me solaire.<\/p>\n

Sur la plan\u00e8te Mars, c’est la sonde Maven <\/a>qui en a d\u00e9tect\u00e9 dans l’ultraviolet jusqu’\u00e0 de tr\u00e8s basses latitudes.<\/p>\n

C’est dans l’infrarouge que la sonde Cassini <\/a>a r\u00e9v\u00e9l\u00e9 les aurores de Saturne. M\u00eame a plus de 1,4 milliard de kilom\u00e8tres le vent solaire interagit avec la haute atmosph\u00e8re de la sixi\u00e8me plan\u00e8te du Syst\u00e8me solaire. L’image ci-dessus a \u00e9t\u00e9 r\u00e9alis\u00e9e en 2007.<\/p>\n

Ce sont des centaines de clich\u00e9s d’aurores sur Saturne que la sonde a accumul\u00e9 depuis le d\u00e9but de sa mission en 2004.\u00a0L’analyse de ces images a permis de constater que les aurores polaires sur Saturne variaient en fonction de l’orientation du Soleil<\/a>, de la rotation de la plan\u00e8te et m\u00eame de la position des satellites <\/a>de la plan\u00e8te aux anneaux.<\/p>\n","protected":false},"excerpt":{"rendered":"

L’atmosph\u00e8re terrestre n’est pas la seule \u00e0 conna\u00eetre des aurores polaires. Les particules \u00e9nerg\u00e9tiques solaires marquent aussi de leur passage la magn\u00e9tosph\u00e8re de Saturne. De nombreux astrophotographes font le voyage en Alaska ou en Islande pour y admirer les aurores polaires. L\u00e0, \u00e0 proximit\u00e9 du p\u00f4le magn\u00e9tique, l\u2019interaction entre le vent solaire et la haute … Continuer la lecture de Des aurores illuminent aussi les p\u00f4les de Saturne<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":2934,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[1045,136,97,754,160,618],"class_list":["post-2933","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-aurore","tag-saturne","tag-soleil","tag-sonde-cassini","tag-systeme-solaire","tag-vent-solaire"],"yoast_head":"\nDes aurores illuminent aussi les p\u00f4les de Saturne<\/title>\n<meta name=\"description\" content=\"L'atmosph\u00e8re terrestre n'est pas la seule \u00e0 conna\u00eetre des aurores polaires. 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