{"id":1707,"date":"2015-01-29T08:12:33","date_gmt":"2015-01-29T08:12:33","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=1707"},"modified":"2015-02-05T08:31:43","modified_gmt":"2015-02-05T08:31:43","slug":"rosetta-etudie-la-magnetosphere-de-la-comete-67p","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/01\/29\/rosetta-etudie-la-magnetosphere-de-la-comete-67p\/","title":{"rendered":"Rosetta \u00e9tudie la magn\u00e9tosph\u00e8re de la com\u00e8te 67P"},"content":{"rendered":"

La sonde europ\u00e9enne Rosetta continue de nous faire d\u00e9couvrir les \u00e9tonnantes particularit\u00e9s de la com\u00e8te 67P\/Churyumov-Gerasimenko<\/a> (Tchouri pour les intimes) sur laquelle on esp\u00e8re toujours voir se r\u00e9veiller le module Philae<\/a>.<\/p>\n

\"comete67P\"<\/a><\/p>\n

Apr\u00e8s avoir d\u00e9couvert que l’eau de cette com\u00e8te<\/a> est tr\u00e8s diff\u00e9rente de l’eau terrestre, Rosetta vient de r\u00e9v\u00e9ler une autre singularit\u00e9 de cet astre chevelu\u00a0: la formation d’un bouclier, \u00e9quivalent \u00e0 la magn\u00e9tosph\u00e8re terrestre, autour du noyau de la com\u00e8te<\/a>.<\/p>\n

En 1986 la pr\u00e9sence d’un tel bouclier avait \u00e9t\u00e9 d\u00e9tect\u00e9e par la sonde europ\u00e9enne Giotto <\/a>alors qu’elle survolait la c\u00e9l\u00e8bre com\u00e8te de Halley<\/a>. Par d\u00e9finition une magn\u00e9tosph\u00e8re n’est observable autour d’un astre qu’en pr\u00e9sence d’un champ magn\u00e9tique. La magn\u00e9tosph\u00e8re des com\u00e8tes est diff\u00e9rente\u00a0: quand un astre chevelu s’approche du Soleil<\/a>, il se met \u00e0 d\u00e9gazer, cr\u00e9ant une sorte \u00ab\u00a0d’atmosph\u00e8re\u00a0\u00bb autour du noyau. Cette enveloppe gazeuse (dont les particules sont ionis\u00e9es par le vent solaire) devient de plus en plus dense au fur et \u00e0 mesure que la com\u00e8te s’approche du Soleil jusqu’au moment o\u00f9 ce bouclier parvient \u00e0 repousser les particules \u00e9nerg\u00e9tiques solaires, g\u00e9n\u00e9rant une onde de choc.<\/p>\n

Si Giotto a pu enregistrer cette onde de choc en 1986 (la com\u00e8te de Halley \u00e9tant au plus pr\u00e8s de notre \u00e9toile au moment de sa rencontre avec la sonde), la mission Rosetta nous permet aujourd’hui d’assister en direct \u00e0 la formation de ce bouclier et d’en suivre le d\u00e9veloppement jusqu’\u00e0 l’\u00e9t\u00e9 prochain, quand la com\u00e8te 67P\/Churyumov-Gerasimenko passera \u00e0 proximit\u00e9 du Soleil <\/a>(\u00e0 un peu plus d’une unit\u00e9 astronomique).<\/p>\n

D’ici l\u00e0 Rosetta devrait continuer \u00e0 nous livrer des informations sur la com\u00e8te 67P, notamment le 14 f\u00e9vrier prochain : l’orbiteur passera \u00e0 seulement 6 km de l’astre chevelu, traversant \u00e0 cette occasion la coma, cette chevelure de gaz et de poussi\u00e8re qui entoure le noyau.<\/p>\n","protected":false},"excerpt":{"rendered":"

La sonde europ\u00e9enne Rosetta continue de nous faire d\u00e9couvrir les \u00e9tonnantes particularit\u00e9s de la com\u00e8te 67P\/Churyumov-Gerasimenko (Tchouri pour les intimes) sur laquelle on esp\u00e8re toujours voir se r\u00e9veiller le module Philae. Apr\u00e8s avoir d\u00e9couvert que l’eau de cette com\u00e8te est tr\u00e8s diff\u00e9rente de l’eau terrestre, Rosetta vient de r\u00e9v\u00e9ler une autre singularit\u00e9 de cet astre … Continuer la lecture de Rosetta \u00e9tudie la magn\u00e9tosph\u00e8re de la com\u00e8te 67P<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":1709,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[787,789,467,786,681,784,788,510,97,785,471,672,618],"class_list":["post-1707","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-champ-magnetique","tag-coma","tag-comete-churyumov-gerasimenko","tag-comete-de-halley","tag-eau","tag-magnetosphere","tag-onde-de-choc","tag-philae","tag-soleil","tag-sonde-giotto","tag-sonde-rosetta","tag-unite-astronomique","tag-vent-solaire"],"yoast_head":"\nRosetta \u00e9tudie la magn\u00e9tosph\u00e8re de la com\u00e8te 67P<\/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\/01\/29\/rosetta-etudie-la-magnetosphere-de-la-comete-67p\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Rosetta \u00e9tudie la magn\u00e9tosph\u00e8re de la com\u00e8te 67P\" \/>\n<meta property=\"og:description\" content=\"La sonde europ\u00e9enne Rosetta continue de nous faire d\u00e9couvrir les \u00e9tonnantes particularit\u00e9s de la com\u00e8te 67P\/Churyumov-Gerasimenko (Tchouri pour les intimes) sur laquelle on esp\u00e8re toujours voir se r\u00e9veiller le module Philae. 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