{"id":6160,"date":"2016-08-14T07:32:13","date_gmt":"2016-08-14T07:32:13","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=6160"},"modified":"2016-08-24T05:39:20","modified_gmt":"2016-08-24T05:39:20","slug":"mysterieux-arc-auroral-ciel-nocturne-canadien","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/08\/14\/mysterieux-arc-auroral-ciel-nocturne-canadien\/","title":{"rendered":"Un myst\u00e9rieux arc auroral dans le ciel nocturne canadien"},"content":{"rendered":"<p><strong>Un photographe a observ\u00e9 un ph\u00e9nom\u00e8ne rare associ\u00e9 aux aurores bor\u00e9ales. Il s&#8217;agit d&#8217;un arc auroral improprement appel\u00e9 arc de protons.<\/strong><\/p>\n<p><a href=\"https:\/\/www.facebook.com\/catalin.tapardel\" target=\"_blank\">Catalin Tapardel<\/a> est un habitu\u00e9 des <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/12\/09\/un-photographe-sous-les-aurores-boreales\/\" target=\"_blank\">aurores bor\u00e9ales<\/a> qu&#8217;il photographie r\u00e9guli\u00e8rement depuis\u00a0le nord de la province de l&#8217;Alberta au Canada, autour de\u00a0Grande Cache, une petite ville fond\u00e9e en 1966 \u00e0 l&#8217;emplacement d&#8217;un ancien lieu de rendez-vous entre\u00a0canadiens fran\u00e7ais, iroquois et m\u00e9tis qui s&#8217;y retrouvaient pour le commerce des fourrures. Ce qu&#8217;il a photographi\u00e9 fin juillet est pourtant bien diff\u00e9rent : il s&#8217;agit d&#8217;un arc auroral qu&#8217;on appelle improprement arc de protons.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/08\/arc_protons.jpg\" rel=\"lightbox[6160]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-6161\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/08\/arc_protons-450x300.jpg\" alt=\"arc_protons\" width=\"450\" height=\"300\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/08\/arc_protons-450x300.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/08\/arc_protons-768x513.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/08\/arc_protons-1024x684.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/08\/arc_protons.jpg 1348w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Les chasseurs d&#8217;aurores observent parfois ces\u00a0rubans lumineux (dont les couleurs varient du rouge au vert) en train de se tordre dans le ciel nocturne pendant quelques minutes avant de s&#8217;\u00e9vanouir.<!--more--><\/p>\n<p>On pensait il y a peu que ces arcs se forment lorsque une majorit\u00e9 de protons issus d&#8217;une \u00e9jection de mati\u00e8re coronale solaire entrent en interaction avec l&#8217;atmosph\u00e8re terrestre (alors que ce sont surtout des \u00e9lectrons qui sont \u00e0 l&#8217;origine des aurores polaires). Mais un certains nombre de chercheurs sp\u00e9cialis\u00e9s dans l&#8217;\u00e9tude des aurores ne sont plus de cet avis aujourd&#8217;hui.<\/p>\n<p>C&#8217;est le cas par exemple de\u00a0Dennis Gallagher (du\u00a0<a href=\"https:\/\/www.nasa.gov\/centers\/marshall\/home\/\" target=\"_blank\"><em>Marshall Space Flight Center<\/em><\/a>) qui rappelle que les protons peuvent provoquer des aurores mais qu&#8217;elles ne ressemblent pas \u00e0 des arcs : elles sont larges, diffuses et faiblement lumineuses pour\u00a0l&#8217;\u0153il humain (elles brillent surtout dans l&#8217;ultraviolet). Une opinion que partage \u00e9galement\u00a0Jason Ahrns, chercheur \u00e0 l&#8217;<a href=\"https:\/\/www.uaf.edu\/\" target=\"_blank\"><em>University of Alaska Fairbanks<\/em><\/a>.<\/p>\n<p>En 2005 <a href=\"http:\/\/auspace.athabascau.ca\/handle\/2149\/518\" target=\"_blank\">une \u00e9quipe scientifique<\/a>\u00a0\u00e9tait parvenue \u00e0 croiser l&#8217;observation d&#8217;un de ces arcs depuis l&#8217;Alberta avec les mesures recueillies par deux satellites m\u00e9t\u00e9orologiques, le NOAA 17 (<a href=\"http:\/\/www.noaa.gov\/\" target=\"_blank\"><em>National Oceanic and Atmospheric Administration<\/em><\/a>) et le DMSP F13 (<a href=\"https:\/\/nsidc.org\/data\/docs\/daac\/f13_platform.gd.html\" target=\"_blank\"><em>Defense Meteorological Satellite Program<\/em><\/a>), mais la nature de ces arcs reste encore bien myst\u00e9rieuse.<\/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 photographe a observ\u00e9 un ph\u00e9nom\u00e8ne rare associ\u00e9 aux aurores bor\u00e9ales. Il s&#8217;agit d&#8217;un arc auroral improprement appel\u00e9 arc de protons. Catalin Tapardel est un habitu\u00e9 des aurores bor\u00e9ales qu&#8217;il photographie r\u00e9guli\u00e8rement depuis\u00a0le nord de la province de l&#8217;Alberta au Canada, autour de\u00a0Grande Cache, une petite ville fond\u00e9e en 1966 \u00e0 l&#8217;emplacement d&#8217;un ancien lieu &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/08\/14\/mysterieux-arc-auroral-ciel-nocturne-canadien\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Un myst\u00e9rieux arc auroral dans le ciel nocturne canadien<\/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":6161,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[85],"tags":[1784,1783,1002,1785,1787,1786,1789,1788,257,1790],"class_list":["post-6160","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-meteores","tag-arc-auroral","tag-arc-de-protons","tag-canada","tag-catalin-tapardel","tag-dennis-gallagher","tag-dmsp","tag-jason-ahrns","tag-marshall-space-flight-center","tag-noaa","tag-university-of-alaska-fairbanks"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Un myst\u00e9rieux arc auroral dans le ciel nocturne canadien<\/title>\n<meta name=\"description\" content=\"Un photographe a observ\u00e9 un ph\u00e9nom\u00e8ne rare associ\u00e9 aux aurores bor\u00e9ales. 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