{"id":14451,"date":"2017-01-11T00:00:35","date_gmt":"2017-01-10T23:00:35","guid":{"rendered":"http:\/\/www.laterredufutur.com\/accueil\/?p=14451"},"modified":"2017-01-11T08:25:10","modified_gmt":"2017-01-11T07:25:10","slug":"on-a-vu-dans-les-entrailles-de-la-terre","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/on-a-vu-dans-les-entrailles-de-la-terre\/","title":{"rendered":"On a vu dans les entrailles de la Terre"},"content":{"rendered":"<div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"1\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n<p>\u00c0 3 000 km sous nos pieds se d\u00e9place une sorte de \u00ab courant-jet \u00bb de fer liquide, c\u2019est ce qu\u2019ont d\u00e9tect\u00e9 trois satellites europ\u00e9ens qui r\u00e9alisent une sorte de radiographie de la Terre. Cette d\u00e9couverte pourrait aider \u00e0 expliquer les variations dans le champ magn\u00e9tique de notre plan\u00e8te.<\/p>\n<p>Gr\u00e2ce \u00e0 un r\u00e9seau de trois satellites Swarm lanc\u00e9s en 2013 par l\u2019Agence spatiale europ\u00e9enne pour \u00e9claircir le fonctionnement du noyau terrestre, des chercheurs britanniques et danois ont peut-\u00eatre perc\u00e9 le myst\u00e8re des changements dans le champ magn\u00e9tique terrestre. Le secret r\u00e9siderait dans une bande de fer en fusion qui circule \u00e0 des centaines de kilom\u00e8tres sous le p\u00f4le Nord et ressemble par son cycle au courant-jet a\u00e9rien que l\u2019on observe dans l\u2019atmosph\u00e8re.<\/p>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"14453\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/on-a-vu-dans-les-entrailles-de-la-terre\/centre-de-terre-courant-de-fer-2\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/12\/centre-de-terre-courant-de-fer-1.jpg?fit=690%2C388&amp;ssl=1\" data-orig-size=\"690,388\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"centre-de-terre-courant-de-fer\" data-image-description=\"\" data-image-caption=\"\" data-medium-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/12\/centre-de-terre-courant-de-fer-1.jpg?fit=300%2C169&amp;ssl=1\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/12\/centre-de-terre-courant-de-fer-1.jpg?fit=690%2C388&amp;ssl=1\" class=\"alignnone size-full wp-image-14453\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/12\/centre-de-terre-courant-de-fer-1.jpg?resize=690%2C388\" alt=\"\" width=\"690\" height=\"388\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/12\/centre-de-terre-courant-de-fer-1.jpg?w=690&amp;ssl=1 690w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/12\/centre-de-terre-courant-de-fer-1.jpg?resize=300%2C169&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/12\/centre-de-terre-courant-de-fer-1.jpg?resize=580%2C326&amp;ssl=1 580w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/12\/centre-de-terre-courant-de-fer-1.jpg?resize=174%2C98&amp;ssl=1 174w\" sizes=\"auto, (max-width: 690px) 100vw, 690px\" \/><\/p>\n<p>Ce courant dans les entrailles de la plan\u00e8te circulerait \u00e0 une vitesse de 40 kilom\u00e8tres par an et transporterait avec lui une partie du champ magn\u00e9tique, celui-l\u00e0 m\u00eame qui nous prot\u00e8ge des radiations cosmiques. D\u2019une longueur de 420 km, il avancerait sous l\u2019Alaska et la Sib\u00e9rie.&nbsp;<\/p><div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"2\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n\n<p>\u00ab Bien s\u00fbr, un tel ph\u00e9nom\u00e8ne n\u00e9cessite de l&rsquo;\u00e9nergie, a analys\u00e9 le professeur Rainer Hollerbach, de l&rsquo;universit\u00e9 de Leeds, en Angleterre. Cette force pourrait venir de la flottabilit\u00e9 [ dans un fluide, les gaz ou liquides sont soumis \u00e0 la pouss\u00e9e d&rsquo;Archim\u00e8de, qui s&rsquo;exerce de bas en haut ], ou plus probablement de changements dans le champ magn\u00e9tique interne \u00bb. \u00ab Cette d\u00e9couverte est un pas important dans notre compr\u00e9hension du fonctionnement interne de notre plan\u00e8te \u00bb, a ajout\u00e9 le docteur Chris Finlay de l\u2019universit\u00e9 du Danemark.<\/p>\n<p>En effet, il est arriv\u00e9 au cours de l\u2019histoire de la Terre que le p\u00f4le Nord magn\u00e9tique passe au p\u00f4le Sud g\u00e9ographique. Ce ph\u00e9nom\u00e8ne a un nom, c\u2019est l\u2019inversion magn\u00e9tique. La derni\u00e8re fois que cela est arriv\u00e9 remonte \u00e0 780 000 ans, et lorsque cela arrive, le bouclier cosmique est fortement affaibli.<\/p>\n<p>Sources : <a href=\"http:\/\/www.esa.int\/Our_Activities\/Observing_the_Earth\/Swarm\/There_s_a_jet_stream_in_our_core\">ESA<\/a>| <a href=\"http:\/\/ici.radio-canada.ca\/nouvelle\/1006974\/un-courant-jet-de-fer-en-fusion-au-centre-de-la-terre\">Radio Canada<\/a>| <a href=\"http:\/\/www.sciencesetavenir.fr\/fondamental\/geologie\/un-courant-de-fer-dans-le-noyau-de-la-terre_109231\">Sciences et Avenir<\/a><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"14451\">(668)<\/p>\n<!--CusAds0-->\n<div style=\"font-size: 0px; height: 0px; line-height: 0px; margin: 0; padding: 0; clear: both;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>\u00c0 3 000 km sous nos pieds se d\u00e9place une sorte de \u00ab courant-jet \u00bb de fer liquide, c\u2019est ce&#8230;<\/p>\n","protected":false},"author":1,"featured_media":14452,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"ngg_post_thumbnail":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"On a vu dans les entrailles de la #Terre @laterredufutur","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[19],"tags":[2747,101,6262,6261,2179,121,75],"class_list":["post-14451","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seismes-et-volcans","tag-courant-jet","tag-energie","tag-fer-liquide","tag-interne","tag-noyau","tag-planete","tag-terre","wpcat-19-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/12\/centre-de-terre-courant-de-fer.jpg?fit=690%2C388&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-3L5","jetpack-related-posts":[{"id":12218,"url":"https:\/\/www.laterredufutur.com\/accueil\/une-nouvelle-etude-nous-demontre-que-le-champ-magnetique-terrestre-est-en-train-de-changer-rapidement\/","url_meta":{"origin":14451,"position":0},"title":"Une nouvelle \u00e9tude nous d\u00e9montre que le champ magn\u00e9tique terrestre est en train de changer rapidement","author":"Admin","date":"13 mai 2016","format":false,"excerpt":"De nouvelles recherches ont montr\u00e9 en d\u00e9tail comment le champ magn\u00e9tique de la Terre est en train de se modifier rapidement. Il agit comme un bouclier pour nous prot\u00e9ger des vents solaires et du rayonnement cosmique - il est en train de changer, il s'affaiblit sur certaines parties du monde,\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/05\/champ-magnetique.jpg?fit=623%2C415&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/05\/champ-magnetique.jpg?fit=623%2C415&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/05\/champ-magnetique.jpg?fit=623%2C415&ssl=1&resize=525%2C300 1.5x"},"classes":[]},{"id":20933,"url":"https:\/\/www.laterredufutur.com\/accueil\/le-champ-magnetique-terrestre-saffaiblit-progressivement-dans-une-zone-allant-de-lafrique-a-lamerique-du-sud\/","url_meta":{"origin":14451,"position":1},"title":"Le champ magn\u00e9tique terrestre s&rsquo;affaiblit progressivement dans une zone allant de l&rsquo;Afrique \u00e0 l&rsquo;Am\u00e9rique du Sud","author":"Admin","date":"22 juin 2020","format":false,"excerpt":"Le champ magn\u00e9tique terrestre s'affaiblit progressivement dans une zone qui s'\u00e9tend de l'Afrique \u00e0 l'Am\u00e9rique du Sud, et des scientifiques tentent de comprendre le pourquoi. Cet affaiblissement provoque \u00e9galement des perturbations techniques dans certains satellites en orbite autour de la Terre. Les scientifiques utilisent les donn\u00e9es de la constellation Swarm\u2026","rel":"","context":"Dans &quot;Divers&quot;","block_context":{"text":"Divers","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/divers\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2020\/05\/champ-magnetique.jpg?fit=640%2C320&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2020\/05\/champ-magnetique.jpg?fit=640%2C320&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2020\/05\/champ-magnetique.jpg?fit=640%2C320&ssl=1&resize=525%2C300 1.5x"},"classes":[]},{"id":11676,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-lune-jouerait-un-role-majeur-dans-le-maintien-du-champ-magnetique-terrestre\/","url_meta":{"origin":14451,"position":2},"title":"La Lune jouerait un r\u00f4le majeur dans le maintien du champ magn\u00e9tique terrestre","author":"Admin","date":"22 avril 2016","format":false,"excerpt":"Le champ magn\u00e9tique terrestre nous prot\u00e8ge chaque jour des particules charg\u00e9es et des radiations issues du rayonnement solaire. Ce bouclier est produit par la g\u00e9odynamo : des mouvements rapides d'\u00e9normes quantit\u00e9s d'alliage de fer liquide dans le noyau externe de la plan\u00e8te. Pour maintenir ce champ magn\u00e9tique jusqu'\u00e0 aujourd'hui, le\u2026","rel":"","context":"Dans &quot;Espace&quot;","block_context":{"text":"Espace","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/lune.jpg?fit=1040%2C1050&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/lune.jpg?fit=1040%2C1050&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/lune.jpg?fit=1040%2C1050&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/lune.jpg?fit=1040%2C1050&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":2126,"url":"https:\/\/www.laterredufutur.com\/accueil\/le-champ-magnetique-terrestre-saffaiblit-plus-vite-que-prevu\/","url_meta":{"origin":14451,"position":3},"title":"Le champ magn\u00e9tique terrestre s&rsquo;affaiblit plus vite que pr\u00e9vu","author":"Admin","date":"3 ao\u00fbt 2014","format":false,"excerpt":"Gr\u00e2ce \u00e0 des satellites lanc\u00e9s en novembre 2013, l'Agence spatiale europ\u00e9enne a pu enregistrer des donn\u00e9es pr\u00e9cises concernant les variations du champ magn\u00e9tique terrestre. Selon les premiers r\u00e9sultats, ce dernier s'affaiblirait bien plus rapidement que pr\u00e9vu. Le champ magn\u00e9tique terrestre s\u2019affaiblit bien plus rapidement que pr\u00e9vu : c\u2019est le constat\u2026","rel":"","context":"Dans &quot;Divers&quot;","block_context":{"text":"Divers","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/divers\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":17724,"url":"https:\/\/www.laterredufutur.com\/accueil\/le-pole-magnetique-continue-de-prendre-la-direction-de-la-russie-et-cree-des-difficultes-de-navigation\/","url_meta":{"origin":14451,"position":4},"title":"Le p\u00f4le magn\u00e9tique continue de prendre la direction de la Russie et cr\u00e9\u00e9 des difficult\u00e9s de navigation","author":"Admin","date":"12 janvier 2019","format":false,"excerpt":"Le pole magn\u00e9tique continue d'\u00e9voluer, le mouvement erratique du p\u00f4le magn\u00e9tique nord oblige les experts \u00e0 mettre \u00e0 jour le mod\u00e8le d'aide \u00e0 la navigation globale. La publication du mod\u00e8le magn\u00e9tique mondial a \u00e9t\u00e9 report\u00e9e au 30 janvier 2019 en raison de la fermeture en cours du gouvernement am\u00e9ricain. Quelque\u2026","rel":"","context":"Dans &quot;Divers&quot;","block_context":{"text":"Divers","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/divers\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/pole-magnetique-pole-nord-2019.jpg?fit=800%2C600&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/pole-magnetique-pole-nord-2019.jpg?fit=800%2C600&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/pole-magnetique-pole-nord-2019.jpg?fit=800%2C600&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/01\/pole-magnetique-pole-nord-2019.jpg?fit=800%2C600&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":26209,"url":"https:\/\/www.laterredufutur.com\/accueil\/decouverte-dune-mysterieuse-structure-en-forme-de-beignet-cachee-dans-le-noyau-de-la-terre\/","url_meta":{"origin":14451,"position":5},"title":"D\u00e9couverte d&rsquo;une myst\u00e9rieuse structure en forme de \u00ab beignet \u00bb cach\u00e9e dans le noyau de la Terre","author":"Admin","date":"10 septembre 2024","format":false,"excerpt":"\u00c0 environ 2 890 kilom\u00e8tres sous nos pieds se trouve une gigantesque boule de m\u00e9tal liquide : le noyau de notre plan\u00e8te. Les scientifiques utilisent les ondes sismiques cr\u00e9\u00e9es par les tremblements de terre comme une sorte d'\u00e9chographie pour \u00ab voir \u00bb la forme et la structure du noyau. Gr\u00e2ce\u2026","rel":"","context":"Dans &quot;Seismes\/Volcans&quot;","block_context":{"text":"Seismes\/Volcans","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/seismes-et-volcans\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/01\/terre.jpg?fit=1200%2C1200&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/01\/terre.jpg?fit=1200%2C1200&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/01\/terre.jpg?fit=1200%2C1200&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/01\/terre.jpg?fit=1200%2C1200&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/01\/terre.jpg?fit=1200%2C1200&ssl=1&resize=1050%2C600 3x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/14451","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/comments?post=14451"}],"version-history":[{"count":1,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/14451\/revisions"}],"predecessor-version":[{"id":14454,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/14451\/revisions\/14454"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media\/14452"}],"wp:attachment":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media?parent=14451"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/categories?post=14451"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/tags?post=14451"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}