{"id":6945,"date":"2016-12-12T17:08:26","date_gmt":"2016-12-12T17:08:26","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=6945"},"modified":"2016-12-22T08:14:35","modified_gmt":"2016-12-22T08:14:35","slug":"nouveau-trou-coronal-declenche-aurores-polaires","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/12\/12\/nouveau-trou-coronal-declenche-aurores-polaires\/","title":{"rendered":"Un nouveau trou coronal d\u00e9clenche des aurores polaires"},"content":{"rendered":"<p><strong>Un trou coronal \u00e0 la surface du Soleil a lib\u00e9r\u00e9 une bouff\u00e9e de particules \u00e0 l&#8217;origine d&#8217;une nouvelle s\u00e9rie d&#8217;aurores polaires.<\/strong><\/p>\n<p>Les astrophysiciens savent que la surface du <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/11\/24\/soleil-vase-etrusque-mer-de-marmara\/\" target=\"_blank\">Soleil<\/a> est parcourue par des champs magn\u00e9tiques. La plupart sont des champs ferm\u00e9s qui sortent de la surface de notre \u00e9toile et y rentrent un peu plus loin, \u00a0formant ainsi une boucle. Mais sans que l&#8217;on ne sache encore vraiment pourquoi, certaines lignes du champ magn\u00e9tique ne se referment pas et laissent place \u00e0 un trou coronal qui lib\u00e8re des gaz chauds.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/12\/aurore.jpg\" rel=\"lightbox[6945]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-6946\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/12\/aurore-450x300.jpg\" alt=\"aurore\" width=\"450\" height=\"300\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/12\/aurore-450x300.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/12\/aurore-768x513.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/12\/aurore-1024x684.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/12\/aurore.jpg 1348w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Ce vent solaire s&#8217;\u00e9chappe alors \u00e0 des vitesses de 600 ou 700 km\/sec, trois fois plus vite qu&#8217;en temps normal. Si le trou coronal fait face \u00e0 la Terre, cette derni\u00e8re subit alors les assauts d&#8217;une temp\u00eate g\u00e9omagn\u00e9tique qui d\u00e9clenche des aurores polaires.<!--more--><\/p>\n<p>l\u2019alerte lanc\u00e9e par la NOAA (<a href=\"http:\/\/www.noaa.gov\/\" target=\"_blank\"><em>National Oceanic and Atmospheric Administration<\/em><\/a>) pour les 7 et 8 d\u00e9cembre a mobilis\u00e9 les astrophotographes qui s\u00e9journaient dans les r\u00e9gions polaires, leur permettant d&#8217;admirer de belles draperies vertes (comme sur l&#8217;image ci-dessus r\u00e9alis\u00e9e le 9 d\u00e9cembre en Finlande par le photographe <a href=\"http:\/\/yourshot.nationalgeographic.com\/profile\/1324603\/\" target=\"_blank\">Mika-Pekka Markkanen<\/a>).<\/p>\n<p>Conna\u00eetre les m\u00e9canismes \u00e0 l&#8217;origine de la formation des trous coronaux est important \u00e0 une \u00e9poque o\u00f9 des astronautes (comme <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/11\/30\/suivez-passages-de-thomas-pesquet-a-bord-de-liss\/\" target=\"_blank\">Thomas Pesquet<\/a>) s\u00e9journent en orbite terrestre \u00e0 bord de l&#8217;ISS.<\/p>\n\n<!-- iframe plugin v.5.1 wordpress.org\/plugins\/iframe\/ -->\n<iframe loading=\"lazy\" src=\"https:\/\/player.vimeo.com\/video\/194659795\" width=\"640\" height=\"360\" frameborder=\"0\" 0=\"webkitallowfullscreen\" 1=\"mozallowfullscreen\" 2=\"allowfullscreen&gt;&lt;\/iframe\" scrolling=\"yes\" class=\"iframe-class\"><\/iframe>\n\n<p>Heureusement cette temp\u00eate g\u00e9omagn\u00e9tique \u00e9tait de niveau G1 sur une \u00e9chelle d\u2019intensit\u00e9 d\u00e9finie par la NOAA et qui s\u2019\u00e9chelonne de G1 (mineure) \u00e0 G5 (extr\u00eame) ; elle a donc eu un impact n\u00e9gligeable sur les occupants de la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/05\/04\/en-video-la-station-spatiale-passe-devant-le-soleil\/\" target=\"_blank\">Station spatiale internationale<\/a>.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Un trou coronal \u00e0 la surface du Soleil a lib\u00e9r\u00e9 une bouff\u00e9e de particules \u00e0 l&#8217;origine d&#8217;une nouvelle s\u00e9rie d&#8217;aurores polaires. Les astrophysiciens savent que la surface du Soleil est parcourue par des champs magn\u00e9tiques. La plupart sont des champs ferm\u00e9s qui sortent de la surface de notre \u00e9toile et y rentrent un peu plus &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/12\/12\/nouveau-trou-coronal-declenche-aurores-polaires\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Un nouveau trou coronal d\u00e9clenche des aurores polaires<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":6946,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[1136,1231,1971,257,97,197,1495,1821],"class_list":["post-6945","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-aurore-polaire","tag-finlande","tag-mika-pekka-markkanen","tag-noaa","tag-soleil","tag-station-spatiale-internationale","tag-thomas-pesquet","tag-trou-coronal"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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