{"id":4194,"date":"2015-11-14T10:32:44","date_gmt":"2015-11-14T10:32:44","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=4194"},"modified":"2015-11-21T07:52:57","modified_gmt":"2015-11-21T07:52:57","slug":"un-filament-circulaire-geant-sest-forme-sur-le-soleil","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/11\/14\/un-filament-circulaire-geant-sest-forme-sur-le-soleil\/","title":{"rendered":"Un filament circulaire g\u00e9ant s&#8217;est form\u00e9 sur le Soleil"},"content":{"rendered":"<p><strong>Les astronomes suivent depuis le 11 novembre le d\u00e9veloppement d&#8217;un immense filament en arc de cercle \u00e0 la surface du Soleil.\u00a0<\/strong><\/p>\n<p>Le premier \u00e0 avoir donn\u00e9 l&#8217;alerte est le satellite solaire <a href=\"http:\/\/sdo.gsfc.nasa.gov\/\" target=\"_blank\">SDO <\/a>(<em>Solar Dynamics Observatory<\/em>) qui observe le Soleil sans interruption dans diff\u00e9rentes longueurs d&#8217;onde depuis 2010.<\/p>\n\n<!-- iframe plugin v.5.1 wordpress.org\/plugins\/iframe\/ -->\n<iframe loading=\"lazy\" frameborder=\"0\" width=\"480\" height=\"270\" src=\"\/\/www.dailymotion.com\/embed\/video\/x2hb4go\" 0=\"allowfullscreen\" scrolling=\"yes\" class=\"iframe-class\"><\/iframe>\n\n<p style=\"text-align: center\"><strong>En vid\u00e9o : de superbes images du Soleil pour f\u00eater les 5 ans du satellite SDO<\/strong><\/p>\n<p>Les images prises le 11 novembre par SDO en\u00a0H-alpha (une raie centr\u00e9e sur 656,3 nanom\u00e8tres caract\u00e9ristique de l&#8217;hydrog\u00e8ne ionis\u00e9) ont r\u00e9v\u00e9l\u00e9 la pr\u00e9sence sur le bord solaire d&#8217;un filament (voir photo ci-dessous r\u00e9alis\u00e9e le 12 novembre) inscrit dans un cercle dont la circonf\u00e9rence approche actuellement 1 million de km.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/11\/soleil41.jpg\" rel=\"lightbox[4194]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-4196\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/11\/soleil41-450x438.jpg\" alt=\"soleil4\" width=\"450\" height=\"438\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/11\/soleil41-450x438.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/11\/soleil41.jpg 821w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Un filament solaire est un &#8220;mur&#8221; de mati\u00e8re solaire incandescente (un plasma d&#8217;hydrog\u00e8ne et de calcium) maintenu en suspension dans la chromosph\u00e8re par de puissants champs magn\u00e9tiques.<\/p>\n<p><!--more-->Plus sombres que le\u00a0reste du disque solaire, les filaments sont appel\u00e9s protub\u00e9rances quand la rotation solaire les entra\u00eene au bord et qu&#8217;ils se d\u00e9tachent sur le fond du ciel. Filaments et protub\u00e9rances laissent parfois s&#8217;\u00e9chapper de la mati\u00e8re solaire dans l&#8217;espace \u00e0 l&#8217;origine des <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/11\/05\/le-nord-de-lamerique-sous-les-aurores-boreales\/\" target=\"_blank\">aurores bor\u00e9ales<\/a> qui illuminent les cieux nordiques.<\/p>\n<p>Ce filament solaire, particuli\u00e8rement original en raison de sa forme, peut \u00eatre photographi\u00e9 uniquement avec des instruments \u00e9quip\u00e9s d&#8217;un filtre H-alpha. Rappelons qu&#8217;un filament de 400 000 km de long avait \u00e9t\u00e9 observ\u00e9 le <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/04\/29\/le-filament-solaire-geant-du-27-avril\/\" target=\"_blank\">27 avril 2015<\/a> et un autre d&#8217;1 million de km le <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/11\/un-filament-geant-sest-forme-sur-le-soleil\/\" target=\"_blank\">11 f\u00e9vrier 2015<\/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>Les astronomes suivent depuis le 11 novembre le d\u00e9veloppement d&#8217;un immense filament en arc de cercle \u00e0 la surface du Soleil.\u00a0 Le premier \u00e0 avoir donn\u00e9 l&#8217;alerte est le satellite solaire SDO (Solar Dynamics Observatory) qui observe le Soleil sans interruption dans diff\u00e9rentes longueurs d&#8217;onde depuis 2010. En vid\u00e9o : de superbes images du Soleil &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/11\/14\/un-filament-circulaire-geant-sest-forme-sur-le-soleil\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Un filament circulaire g\u00e9ant s&#8217;est form\u00e9 sur le Soleil<\/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":4195,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[395,832,321,577,97],"class_list":["post-4194","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-aurore-boreale","tag-filament-solaire","tag-protuberance","tag-sdo","tag-soleil"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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