{"id":6296,"date":"2016-09-08T15:33:47","date_gmt":"2016-09-08T15:33:47","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=6296"},"modified":"2016-09-18T07:44:56","modified_gmt":"2016-09-18T07:44:56","slug":"de-curieuses-aurores-boreales-observees-nord-usa","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/09\/08\/de-curieuses-aurores-boreales-observees-nord-usa\/","title":{"rendered":"De curieuses aurores bor\u00e9ales observ\u00e9es au nord des USA"},"content":{"rendered":"

Plusieurs photographes install\u00e9s \u00e0 de hautes latitudes ont immortalis\u00e9 d’\u00e9tonnantes aurores bor\u00e9ales au d\u00e9but du mois de septembre.<\/strong><\/p>\n

Le 1er septembre, quelques heures apr\u00e8s l’\u00e9clipse annulaire de Soleil<\/a> visible depuis l’\u00eele de la R\u00e9union,\u00a0Un flux de vent solaire est venu caresser les hautes couches de l’atmosph\u00e8re terrestre et perturber le champ magn\u00e9tique de notre plan\u00e8te, d\u00e9clenchant une s\u00e9rie de temp\u00eates g\u00e9omagn\u00e9tiques et d’aurores bor\u00e9ales visibles depuis les hautes latitudes. Des photographes install\u00e9s en Alaska, au Canada, en Finlande et m\u00eame au nord des USA ont saisi d’\u00e9tonnantes draperies.<\/p>\n

\"aurore\"<\/a><\/p>\n

C’est le cas par exemple de A. G. Evans<\/a>\u00a0(dont je vous avais pr\u00e9sent\u00e9 il y a quelques mois des citrouilles<\/a> sous les aurores bor\u00e9ales) depuis la Nouvelle-Angleterre, une r\u00e9gion au nord-est des \u00c9tats-Unis qui compte six \u00c9tats (Maine, Massachusetts, New Hampshire, Vermont, Rhode Island et Connecticut).<\/p>\n

Ces temp\u00eates g\u00e9omagn\u00e9tiques sont sans doute \u00e0 mettre sur le compte d’une activit\u00e9 solaire soutenue : plusieurs groupes de taches sont en effet visibles depuis quelques jours dont AR 2585, une r\u00e9gion riche en perturbations magn\u00e9tiques \u00e0 la surface de notre \u00e9toile.\u00a0Le satellite solaire SDO<\/a> a \u00e9galement rep\u00e9r\u00e9 un trou coronal important, une\u00a0r\u00e9gion du Soleil o\u00f9 les lignes du champ magn\u00e9tique s\u2019ouvrent vers l\u2019espace et laissent s’\u00e9chapper les gaz chauds. SDO avait d\u00e9j\u00e0 film\u00e9 un immense trou coronal sur le Soleil<\/a> en mai dernier.<\/p>\n

Si les aurores bor\u00e9ales ne sont pas un ph\u00e9nom\u00e8ne exceptionnel, c’est l’aspect de celles du 1er septembre qui retient l’attention : elles ont dessin\u00e9 d’\u00e9tonnantes stries verticales vertes \u00e9ph\u00e9m\u00e8res dans le ciel.<\/p>\n","protected":false},"excerpt":{"rendered":"

Plusieurs photographes install\u00e9s \u00e0 de hautes latitudes ont immortalis\u00e9 d’\u00e9tonnantes aurores bor\u00e9ales au d\u00e9but du mois de septembre. Le 1er septembre, quelques heures apr\u00e8s l’\u00e9clipse annulaire de Soleil visible depuis l’\u00eele de la R\u00e9union,\u00a0Un flux de vent solaire est venu caresser les hautes couches de l’atmosph\u00e8re terrestre et perturber le champ magn\u00e9tique de notre plan\u00e8te, … Continuer la lecture de De curieuses aurores bor\u00e9ales observ\u00e9es au nord des USA<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":6297,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[85],"tags":[1314,395,1822,577,261,1821],"class_list":["post-6296","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-meteores","tag-a-g-evans","tag-aurore-boreale","tag-nouvelle-angleterre","tag-sdo","tag-tache-solaire","tag-trou-coronal"],"yoast_head":"\nDe curieuses aurores bor\u00e9ales observ\u00e9es au nord des 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