{"id":10112,"date":"2023-11-16T19:59:57","date_gmt":"2023-11-16T19:59:57","guid":{"rendered":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/politique\/le-sursaut-gamma-le-plus-brillant-de-tous-les-temps-a-eu-des-consequences-sur-la-terre"},"modified":"2023-11-16T22:14:52","modified_gmt":"2023-11-16T22:14:52","slug":"le-sursaut-gamma-le-plus-brillant-de-tous-les-temps-a-eu-des-consequences-sur-la-terre","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/toutes-les-actualites\/le-sursaut-gamma-le-plus-brillant-de-tous-les-temps-a-eu-des-consequences-sur-la-terre","title":{"rendered":"Le sursaut gamma le plus brillant de tous les temps a eu des cons\u00e9quences sur la Terre"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; S\u00e3o Tom\u00e9 e Pr\u00edncipe. <\/strong><\/span>Un flash de lumie\u0300re d\u2019une e\u0301nergie record, qui a atteint la Terre l\u2019an dernier au terme d\u2019un voyage de deux milliards d\u2019anne\u0301es-lumie\u0300re a\u0300 travers le cosmos, a perturbe\u0301 les hautes couches de l\u2019atmosphe\u0300re de manie\u0300re ine\u0301dite, selon une e\u0301tude publie\u0301e mardi 14 novembre 2023.<\/p>\n<p><b>Une question de\u0301battue depuis 20 ans<\/b><\/p>\n<p>Le 9 octobre 2022, les astronomes ont de\u0301tecte\u0301 une gigantesque e\u0301ruption de rayons gamma, la forme la plus intense du rayonnement e\u0301lectromagne\u0301tique, un phe\u0301nome\u0300ne provoque\u0301 par les e\u0301ve\u0300nements les plus extre\u0302mes de l\u2019Univers, comme les explosions d\u2019e\u0301toiles ge\u0301antes.<\/p>\n<p>Ce sursaut gamma surnomme\u0301 BOAT (\u201cBrightest Of All Time\u201d: \u201cLe plus brillant de tous les temps\u201d), e\u0301mis a\u0300 une distance d\u2019environ deux milliards d\u2019anne\u0301es-lumie\u0300re, a illumine\u0301 les te\u0301lescopes pendant seulement sept minutes, mais laisse\u0301 une lumie\u0300re re\u0301siduelle visible par les astronomes amateurs pendant sept heures.<\/p>\n<p>Le puissant e\u0301clair a active\u0301 des de\u0301tecteurs de foudre en Inde, et de\u0301clenche\u0301 des instruments de\u0301die\u0301s a\u0300 l\u2019e\u0301tude des e\u0301ruptions solaires. Rapidement, les scientifiques ont pu de\u0301terminer son impact sur les communications radio en grandes ondes dans la partie infe\u0301rieure de l\u2019ionosphe\u0300re (la couche supe\u0301rieure de l\u2019atmosphe\u0300re terrestre), entre 60 et 350 kilome\u0300tres d\u2019altitude.<\/p>\n<p>En poursuivant l\u2019analyse du phe\u0301nome\u0300ne, des chercheurs italiens et chinois ont observe\u0301, pour la premie\u0300re fois, qu\u2019il avait aussi touche\u0301 la partie haute de cette me\u0302me ionosphe\u0300re.<\/p>\n<p>Situe\u0301e entre 350 et 950 kilome\u0300tres au-dessus de la Terre, pre\u0300s de la limite de l\u2019espace, la haute ionosphe\u0300re est l\u2019endroit ou\u0300 le rayonnement du Soleil se transforme en particules charge\u0301es qui forment un important champ e\u0301lectrique.<\/p>\n<p>Depuis une vingtaine d\u2019anne\u0301es, les experts de\u0301battent de la possibilite\u0301 que les sursauts gamma puissent affecter la haute ionosphe\u0300re, explique a\u0300 l\u2019AFP Mirko Piersanti, auteur principal de l\u2019e\u0301tude parue dans Nature Communications. \u201cJe pense que nous avons enfin re\u0301pondu a\u0300 cette question\u201d, a commente\u0301 ce chercheur a\u0300 l\u2019universite\u0301 italienne de L\u2019Aquila.<\/p>\n<p><b>\u201cEffacer\u201d la couche d\u2019ozone ?<\/b><\/p>\n<p>Coup de chance pour son e\u0301quipe : le satellite sino-italien CSES, e\u0301quipe\u0301 d\u2019un de\u0301tecteur de champ e\u0301lectrique, se trouvait \u201cexactement dans la zone illumine\u0301e par le sursaut gamma\u201d, a\u0300 500 km au-dessus de la Terre. \u201cNous avons trouve\u0301 une forme dans le champ e\u0301lectrique jamais observe\u0301e auparavant\u201d, pre\u0301cise le chercheur.<\/p>\n<p>\u201cC\u2019est incroyable, nous pouvons voir des choses qui se produisent dans l\u2019espace lointain mais qui affectent aussi la Terre\u201d, a souligne\u0301 Erik Kuulkers, expert en rayons gamma a\u0300 l\u2019Agence spatiale europe\u0301enne (ESA), dans un communique\u0301. La de\u0301couverte devrait aider a\u0300 comprendre la menace potentielle de futurs sursauts gamma.<\/p>\n<p>Le pire des sce\u0301narios serait qu\u2019une e\u0301ruption aussi puissante se produise dans notre galaxie, la Voie lacte\u0301e. Elle aurait le pouvoir \u201cd\u2019effacer comple\u0300tement\u201d la couche d\u2019ozone de la Terre, de\u0301taille Mirko Piersanti.<\/p>\n<p>Tout ce qui se trouve a\u0300 la surface serait alors expose\u0301 aux rayons ultraviolets du Soleil, ce qui pourrait ane\u0301antir la vie sur Terre. Mais pas d\u2019affolement car il est tout aussi probable que l\u2019ionosphe\u0300re absorbe tous les rayons gamma et qu\u2019il \u201cne se passe rien\u201d pour les Terriens, poursuit le chercheur.<\/p>\n<p>Le sursaut gamma BOAT survenu l\u2019an dernier dans notre ciel depuis la petite constellation de la Fle\u0300che, officiellement appele\u0301 GRB 221009A, proviendrait soit de l\u2019explosion d\u2019une e\u0301toile massive en fin de vie, soit de la naissance d\u2019un trou noir.<\/p>\n<p>Ou des deux, e\u0301tant donne\u0301 sa puissance: une e\u0301toile ge\u0301ante explose et devient une supernova, avant de s\u2019effondrer sur elle-me\u0302me et de former un trou noir. De la matie\u0300re forme alors un disque autour du trou noir, y est absorbe\u0301e et rejete\u0301e sous forme d\u2019e\u0301nergie. En moyenne, plus d\u2019un sursaut gamma atteint la Terre chaque jour, mais on estime qu\u2019un sursaut de l\u2019intensite\u0301 de BOAT ne se produit qu\u2019une fois tous les 10.000 ans.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/sao-tome-e-principe\">S\u00e3o Tom\u00e9 e Pr\u00edncipe<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; S\u00e3o Tom\u00e9 e Pr\u00edncipe. Un flash de lumie\u0300re d\u2019une e\u0301nergie record, qui a atteint la Terre l\u2019an dernier au terme d\u2019un voyage de deux milliards d\u2019anne\u0301es-lumie\u0300re a\u0300 travers le cosmos, a perturbe\u0301 les hautes couches de l\u2019atmosphe\u0300re de manie\u0300re ine\u0301dite, selon une e\u0301tude publie\u0301e mardi 14 novembre 2023. Une question de\u0301battue depuis 20 [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":10111,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,55,56],"class_list":["post-10112","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-sao-tome-e-principe","tag-sao-tome-e-principe"],"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>Le sursaut gamma le plus brillant de tous les temps a eu des cons\u00e9quences sur la Terre - S\u00e3o Tom\u00e9 e Pr\u00edncipe<\/title>\n<meta name=\"description\" content=\"Un flash de lumie\u0300re d\u2019une e\u0301nergie record, qui a atteint la Terre l\u2019an dernier au terme d\u2019un voyage de deux 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