{"id":9990,"date":"2018-12-02T14:20:59","date_gmt":"2018-12-02T14:20:59","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=9990"},"modified":"2018-12-14T16:55:04","modified_gmt":"2018-12-14T16:55:04","slug":"un-trou-coronal-provoque-une-serie-daurores-boreales","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/12\/02\/un-trou-coronal-provoque-une-serie-daurores-boreales\/","title":{"rendered":"Un trou coronal provoque une s\u00e9rie d’aurores bor\u00e9ales"},"content":{"rendered":"

Un trou coronal \u00e0 la surface du Soleil est \u00e0 l’origine d’une belle s\u00e9rie d\u2019aurores bor\u00e9ales observ\u00e9es les deux premiers jours de d\u00e9cembre.<\/strong><\/p>\n

Les champs magn\u00e9tiques \u00e0 la surface du\u00a0Soleil<\/a>\u00a0sont en g\u00e9n\u00e9ral des champs ferm\u00e9s ; ils sortent de la surface de notre \u00e9toile et y rentrent un peu plus loin, \u00a0formant ainsi une boucle. Mais il arrive que certaines lignes du champ magn\u00e9tique ne se referment pas pour des raisons encore inexpliqu\u00e9es : on observe alors une zone de champs magn\u00e9tiques ouverts appel\u00e9e \u00ab trou coronal \u00bb en raison de son aspect sombre sur les clich\u00e9s.<\/p>\n

\"\"<\/a>
Le trou coronal photographi\u00e9 \u00e0 la surface du Soleil le 29 novembre. \u00a9 SDO\/AIA<\/figcaption><\/figure>\n

De ce trou coronal s’\u00e9chappe de violentes bouff\u00e9es de vent solaire. Si le trou est tourn\u00e9 face \u00e0 Terre, cette derni\u00e8re subit alors les assauts d\u2019une temp\u00eate g\u00e9omagn\u00e9tique qui d\u00e9clenche des aurores polaires deux ou trois jours plus tard.<\/p>\n

Suite \u00e0 la d\u00e9tection d’un important trou coronal le 29 novembre, la NOAA (National Oceanic and Atmospheric Administration<\/em><\/a>) a lanc\u00e9 un avis de temp\u00eate g\u00e9omagn\u00e9tique pour les 1er et 2 d\u00e9cembre, confirm\u00e9 par les images des astrophotographes qui s\u00e9journaient dans les r\u00e9gions polaires (exemple avec le clich\u00e9 ci-dessous r\u00e9alis\u00e9 le 1er d\u00e9cembre en Norv\u00e8ge par\u00a0Tom Arne Molden\u00e6s<\/a>).<\/p>\n

\"\"<\/a>
Une aurore bor\u00e9ale se d\u00e9ploie le 1er d\u00e9cembre en Norv\u00e8ge. \u00a9 Tom Arne Molden\u00e6s<\/figcaption><\/figure>\n

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\u00a0Station spatiale internationale<\/a>\u00a0qui ne b\u00e9n\u00e9ficient pas de la protection que nous offre notre atmosph\u00e8re.<\/p>\n","protected":false},"excerpt":{"rendered":"

Un trou coronal \u00e0 la surface du Soleil est \u00e0 l’origine d’une belle s\u00e9rie d\u2019aurores bor\u00e9ales observ\u00e9es les deux premiers jours de d\u00e9cembre. Les champs magn\u00e9tiques \u00e0 la surface du\u00a0Soleil\u00a0sont en g\u00e9n\u00e9ral des champs ferm\u00e9s ; ils sortent de la surface de notre \u00e9toile et y rentrent un peu plus loin, \u00a0formant ainsi une boucle. … Continuer la lecture de Un trou coronal provoque une s\u00e9rie d’aurores bor\u00e9ales<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":9991,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[85],"tags":[1136,1514,97,1349,2606,1821],"class_list":["post-9990","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-meteores","tag-aurore-polaire","tag-norvege","tag-soleil","tag-tempete-geomagnetique","tag-tom-arne-moldenaes","tag-trou-coronal"],"yoast_head":"\nUn trou coronal provoque une s\u00e9rie d'aurores bor\u00e9ales<\/title>\n<meta name=\"description\" content=\"Un trou 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