{"id":56409,"date":"2026-04-07T14:51:39","date_gmt":"2026-04-07T14:51:39","guid":{"rendered":"https:\/\/www.africa-press.net\/djibouti\/politique\/les-moteurs-du-magnetisme-terrestre"},"modified":"2026-04-07T15:46:01","modified_gmt":"2026-04-07T15:46:01","slug":"les-moteurs-du-magnetisme-terrestre","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/les-moteurs-du-magnetisme-terrestre","title":{"rendered":"Les moteurs du magn\u00e9tisme terrestre"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Djibouti. <\/strong><\/span>Dans une e\u0301tude publie\u0301e dans Nature Geoscience, des chercheurs de l&rsquo;universite\u0301 de Liverpool (Royaume-Uni) montrent que deux immenses structures rocheuses surchauffe\u0301es situe\u0301es a\u0300 la base du manteau terrestre, a\u0300 environ 2900 km de profondeur sous l&rsquo;Afrique et l&rsquo;oce\u0301an Pacifique, influencent le champ magne\u0301tique terrestre depuis des millions d&rsquo;anne\u0301es.<\/p>\n<p><b>265 millions d&rsquo;anne\u0301es de mouvement du fer liquide dans le noyau externe<\/b><\/p>\n<p>Pour cela, ils ont combine\u0301 l&rsquo;e\u0301tude des anciens champs magne\u0301tiques enregistre\u0301s dans les roches avec des simulations nume\u0301riques de la ge\u0301odynamo, reconstituant ainsi les 265 derniers millions d&rsquo;anne\u0301es de mouvement du fer liquide dans le noyau externe, mouvement qui ge\u0301ne\u0300re le champ magne\u0301tique.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"453\" height=\"72\" class=\"alignnone wp-image-56407 size-full\" src=\"https:\/\/static.africa-press.net\/djibouti\/sites\/52\/2026\/04\/sm_1775563979.027625.jpg\" srcset=\"https:\/\/static.africa-press.net\/djibouti\/sites\/52\/2026\/04\/sm_1775563979.027625.jpg 453w, https:\/\/static.africa-press.net\/djibouti\/sites\/52\/2026\/04\/sm_1775563979.027625-300x48.jpg 300w\" sizes=\"auto, (max-width: 453px) 100vw, 453px\" \/><br \/>\n<b>Une influence sur la forme et l&rsquo;e\u0301volution du champ magne\u0301tique terrestre<\/b><\/p>\n<p>Ils ont ainsi de\u0301couvert que la tempe\u0301rature a\u0300 la frontie\u0300re entre le manteau et le noyau est tre\u0300s he\u0301te\u0301roge\u0300ne. Sous les zones les plus chaudes, le fer liquide du noyau peut ralentir ou stagner, alors qu&rsquo;il circule plus activement sous les re\u0301gions plus froides. Des diffe\u0301rences qui influencent la forme et l&rsquo;e\u0301volution du champ magne\u0301tique terrestre.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">Djibouti<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Djibouti. Dans une e\u0301tude publie\u0301e dans Nature Geoscience, des chercheurs de l&rsquo;universite\u0301 de Liverpool (Royaume-Uni) montrent que deux immenses structures rocheuses surchauffe\u0301es situe\u0301es a\u0300 la base du manteau terrestre, a\u0300 environ 2900 km de profondeur sous l&rsquo;Afrique et l&rsquo;oce\u0301an Pacifique, influencent le champ magne\u0301tique terrestre depuis des millions d&rsquo;anne\u0301es. 265 millions d&rsquo;anne\u0301es de [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":56408,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[50],"class_list":["post-56409","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-djibouti"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Les moteurs du magn\u00e9tisme terrestre - Djibouti<\/title>\n<meta name=\"description\" content=\"Dans une e\u0301tude publie\u0301e dans Nature Geoscience, des chercheurs de l&#039;universite\u0301 de Liverpool (Royaume-Uni) montrent que ...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/les-moteurs-du-magnetisme-terrestre\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Les moteurs du magn\u00e9tisme terrestre\" \/>\n<meta property=\"og:description\" content=\"Dans une e\u0301tude publie\u0301e dans Nature Geoscience, des chercheurs de l&#039;universite\u0301 de Liverpool (Royaume-Uni) montrent que ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/les-moteurs-du-magnetisme-terrestre\" \/>\n<meta property=\"og:site_name\" content=\"Djibouti\" \/>\n<meta property=\"article:published_time\" content=\"2026-04-07T14:51:39+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-04-07T15:46:01+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/djibouti\/sites\/52\/2026\/04\/sm_1775563984.844221.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"895\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"cfeditorfr\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"cfeditorfr\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/les-moteurs-du-magnetisme-terrestre#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/les-moteurs-du-magnetisme-terrestre\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/djibouti\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"Les moteurs du magn\u00e9tisme terrestre\",\"datePublished\":\"2026-04-07T14:51:39+00:00\",\"dateModified\":\"2026-04-07T15:46:01+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/les-moteurs-du-magnetisme-terrestre\"},\"wordCount\":228,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/les-moteurs-du-magnetisme-terrestre#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/djibouti\/sites\/52\/2026\/04\/sm_1775563984.844221.jpg\",\"keywords\":[\"Djibouti\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/les-moteurs-du-magnetisme-terrestre#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/les-moteurs-du-magnetisme-terrestre\",\"url\":\"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/les-moteurs-du-magnetisme-terrestre\",\"name\":\"Les moteurs du magn\u00e9tisme terrestre - 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