{"id":2820,"date":"2015-05-27T04:51:30","date_gmt":"2015-05-27T04:51:30","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=2820"},"modified":"2015-06-03T04:50:36","modified_gmt":"2015-06-03T04:50:36","slug":"la-sonde-maven-enregistre-des-aurores-polaires-sur-mars","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/05\/27\/la-sonde-maven-enregistre-des-aurores-polaires-sur-mars\/","title":{"rendered":"La sonde Maven enregistre des aurores polaires sur Mars"},"content":{"rendered":"

La sonde am\u00e9ricaine Maven <\/a>(Mars Atmosphere and Volatile Evolution missioN<\/em>) a \u00e9t\u00e9 mise en orbite autour de la plan\u00e8te Mars <\/a>le 21 septembre 2014 au terme d’un voyage de 10 mois. Maven est un orbiteur de 717 kg et 11 m d’envergure dont les 8 instruments scientifiques sont charg\u00e9s d’\u00e9tudier l’interaction entre le vent solaire et l’atmosph\u00e8re de la Plan\u00e8te rouge depuis une orbite elliptique (la distance entre Maven et la surface de Mars <\/a>varie de 150 \u00e0 6300 km).<\/p>\n

\"mars_aurore2\"<\/a><\/p>\n

En d\u00e9cembre dernier le spectrographe ultraviolet de l’orbiteur a enregistr\u00e9 des aurores polaires tr\u00e8s \u00e9tendues dans tout l’h\u00e9misph\u00e8re nord de la Plan\u00e8te rouge qui descendaient jusqu’\u00e0 30\u00b0 de latitude.<\/p>\n

Les aurores martiennes sont diff\u00e9rentes des aurores terrestres<\/a>. Sur Terre les particules \u00e9nerg\u00e9tiques solaires suivent les lignes du champ magn\u00e9tique et p\u00e9n\u00e8trent dans l’atmosph\u00e8re au niveau des p\u00f4les (rappelons que notre plan\u00e8te a un champ magn\u00e9tique global, g\u00e9n\u00e9r\u00e9 gr\u00e2ce \u00e0 la rotation d’un noyau de m\u00e9tal liquide\u00a0: c’est l’effet dynamo). Une fois dans notre atmosph\u00e8re, les particules solaires ionisent principalement des mol\u00e9cules d’oxyg\u00e8ne (couleurs verte et rouge) et un peu d’azote (couleur rose).<\/p>\n

Sur Mars <\/a>le champ magn\u00e9tique global est inexistant mais les particules solaires sont pi\u00e9g\u00e9es par des champs magn\u00e9tiques r\u00e9manents localis\u00e9s dans le sous-sol de certaines r\u00e9gions, ce qui explique que ces aurores puissent se d\u00e9velopper \u00e0 de tr\u00e8s basses latitudes. L’atmosph\u00e8re de Mars \u00e9tant principalement compos\u00e9e de dioxyde de carbone, la plupart des \u00e9missions aurorales se d\u00e9tectent dans l’ultraviolet.<\/p>\n","protected":false},"excerpt":{"rendered":"

La sonde am\u00e9ricaine Maven (Mars Atmosphere and Volatile Evolution missioN) a \u00e9t\u00e9 mise en orbite autour de la plan\u00e8te Mars le 21 septembre 2014 au terme d’un voyage de 10 mois. Maven est un orbiteur de 717 kg et 11 m d’envergure dont les 8 instruments scientifiques sont charg\u00e9s d’\u00e9tudier l’interaction entre le vent solaire … Continuer la lecture de La sonde Maven enregistre des aurores polaires sur Mars<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":2822,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[1045,787,116,857,534,114,115],"class_list":["post-2820","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-aurore","tag-champ-magnetique","tag-mars","tag-maven","tag-orbiteur","tag-planete","tag-planete-rouge"],"yoast_head":"\nLa sonde Maven enregistre des aurores polaires sur Mars<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/05\/27\/la-sonde-maven-enregistre-des-aurores-polaires-sur-mars\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La sonde Maven enregistre des aurores polaires sur Mars\" \/>\n<meta property=\"og:description\" content=\"La sonde am\u00e9ricaine Maven (Mars Atmosphere and Volatile Evolution missioN) a \u00e9t\u00e9 mise en orbite autour de la plan\u00e8te Mars le 21 septembre 2014 au terme d’un voyage de 10 mois. Maven est un orbiteur de 717 kg et 11 m d’envergure dont les 8 instruments scientifiques sont charg\u00e9s d’\u00e9tudier l’interaction entre le vent solaire … Continuer la lecture de La sonde Maven enregistre des aurores polaires sur Mars →\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/05\/27\/la-sonde-maven-enregistre-des-aurores-polaires-sur-mars\/\" \/>\n<meta property=\"og:site_name\" content=\"CIELMANIA : le blog de Jean-Baptiste FELDMANN, photographe du ciel\" \/>\n<meta property=\"article:published_time\" content=\"2015-05-27T04:51:30+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2015-06-03T04:50:36+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/05\/mars_aurore1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"900\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Jean-Baptiste FELDMANN\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Jean-Baptiste FELDMANN\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/05\/27\/la-sonde-maven-enregistre-des-aurores-polaires-sur-mars\/\",\"url\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/05\/27\/la-sonde-maven-enregistre-des-aurores-polaires-sur-mars\/\",\"name\":\"La sonde Maven enregistre des aurores polaires sur Mars\",\"isPartOf\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/05\/27\/la-sonde-maven-enregistre-des-aurores-polaires-sur-mars\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/05\/27\/la-sonde-maven-enregistre-des-aurores-polaires-sur-mars\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/05\/mars_aurore1.jpg\",\"datePublished\":\"2015-05-27T04:51:30+00:00\",\"dateModified\":\"2015-06-03T04:50:36+00:00\",\"author\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/#\/schema\/person\/62b391b709c307783237b759b62731ea\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/05\/27\/la-sonde-maven-enregistre-des-aurores-polaires-sur-mars\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/05\/27\/la-sonde-maven-enregistre-des-aurores-polaires-sur-mars\/#primaryimage\",\"url\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/05\/mars_aurore1.jpg\",\"contentUrl\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/05\/mars_aurore1.jpg\",\"width\":1200,\"height\":900},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/#website\",\"url\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/\",\"name\":\"CIELMANIA : le blog de Jean-Baptiste FELDMANN, photographe du ciel\",\"description\":\""J'ai en moi un besoin terrible. 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