Un flash de lumi\u00e8re d\u2019une \u00e9nergie record, qui a atteint la Terre l\u2019an dernier au terme d\u2019un voyage de deux milliards d\u2019ann\u00e9es-lumi\u00e8re \u00e0 travers le cosmos, a perturb\u00e9 les hautes couches de l\u2019atmosph\u00e8re de mani\u00e8re in\u00e9dite, selon une \u00e9tude publi\u00e9e mardi.<\/p>\n\n\n\n
Le 9 octobre 2022, les astronomes ont d\u00e9tect\u00e9 une gigantesque \u00e9ruption de rayons gamma, la forme la plus intense du rayonnement \u00e9lectromagn\u00e9tique, un ph\u00e9nom\u00e8ne provoqu\u00e9 par les \u00e9v\u00e8nements les plus extr\u00eames de l\u2019Univers, comme les explosions d\u2019\u00e9toiles g\u00e9antes.Ce sursaut gamma surnomm\u00e9 BOAT (\u201cBrightest Of All Time\u201d: \u201cLe plus brillant de tous les temps\u201d), \u00e9mis \u00e0 une distance d\u2019environ deux milliards d\u2019ann\u00e9es-lumi\u00e8re, a illumin\u00e9 les t\u00e9lescopes pendant seulement sept minutes, mais laiss\u00e9 une lumi\u00e8re r\u00e9siduelle visible par les astronomes amateurs pendant sept heures.Le puissant \u00e9clair a activ\u00e9 des d\u00e9tecteurs de foudre en Inde, et d\u00e9clench\u00e9 des instruments d\u00e9di\u00e9s \u00e0 l\u2019\u00e9tude des \u00e9ruptions solaires.<\/p>\n\n\n\n
Perturbation dans l\u2019ionosph\u00e8re<\/p>\n\n\n\n
Rapidement, les scientifiques ont pu d\u00e9terminer son impact sur les communications radio en grandes ondes dans la partie inf\u00e9rieure de l\u2019ionosph\u00e8re (la couche sup\u00e9rieure de l\u2019atmosph\u00e8re terrestre), entre 60 et 350 kilom\u00e8tres d\u2019altitude.En poursuivant l\u2019analyse du ph\u00e9nom\u00e8ne, des chercheurs italiens et chinois ont observ\u00e9, pour la premi\u00e8re fois, qu\u2019il avait aussi touch\u00e9 la partie haute de cette m\u00eame ionosph\u00e8re.<\/p>\n","protected":false},"excerpt":{"rendered":"
Un flash de lumi\u00e8re d\u2019une \u00e9nergie record, qui a atteint la Terre l\u2019an dernier au terme d\u2019un voyage de deux<\/p>\n","protected":false},"author":1,"featured_media":25164,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[46],"tags":[],"class_list":["post-25163","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technology"],"_links":{"self":[{"href":"https:\/\/dekkbi.com\/index.php?rest_route=\/wp\/v2\/posts\/25163","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dekkbi.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dekkbi.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dekkbi.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dekkbi.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=25163"}],"version-history":[{"count":1,"href":"https:\/\/dekkbi.com\/index.php?rest_route=\/wp\/v2\/posts\/25163\/revisions"}],"predecessor-version":[{"id":25165,"href":"https:\/\/dekkbi.com\/index.php?rest_route=\/wp\/v2\/posts\/25163\/revisions\/25165"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dekkbi.com\/index.php?rest_route=\/wp\/v2\/media\/25164"}],"wp:attachment":[{"href":"https:\/\/dekkbi.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=25163"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dekkbi.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=25163"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dekkbi.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=25163"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}