{"id":8572,"date":"2017-12-06T13:25:36","date_gmt":"2017-12-06T13:25:36","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=8572"},"modified":"2017-12-16T11:14:23","modified_gmt":"2017-12-16T11:14:23","slug":"de-belles-aurores-polaires-se-deploient-malgre-super-lune","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/12\/06\/de-belles-aurores-polaires-se-deploient-malgre-super-lune\/","title":{"rendered":"De belles aurores polaires se d\u00e9ploient malgr\u00e9 la Super Lune"},"content":{"rendered":"<p><strong>L&#8217;aveuglante Super Lune du dimanche 3 d\u00e9cembre n&#8217;a pas emp\u00each\u00e9 les aurores d&#8217;illuminer le ciel nordique, pour la plus grande joie des astrophotographes.<\/strong><\/p>\n<p>Sauf s&#8217;ils ont d\u00e9cid\u00e9 de lui tirer le portrait, les <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/14\/lumiere-rouge-les-astronomes\/\" target=\"_blank\" rel=\"noopener\">astronomes<\/a> sont nombreux \u00e0 ne pas sortir leurs t\u00e9lescopes au moment de la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/05\/06\/359\/\" target=\"_blank\" rel=\"noopener\">Pleine Lune<\/a>. Il faut dire que l&#8217;\u00e9clat de notre satellite naturel (on parle de sa <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitude<\/a>) est tel que seules quelques brillantes \u00e9toiles restent visibles dans un ciel d&#8217;une rare clart\u00e9. Le ph\u00e9nom\u00e8ne est encore plus prononc\u00e9 dans le cas d&#8217;une <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/12\/03\/la-super-lune-et-la-girafe\/\" target=\"_blank\" rel=\"noopener\">Super Lune<\/a> hivernale qui passe presque au z\u00e9nith.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/12\/murm1.jpg\" rel=\"lightbox[8572]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-8574\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/12\/murm1-450x409.jpg\" alt=\"\" width=\"450\" height=\"409\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/12\/murm1-450x409.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/12\/murm1-768x698.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/12\/murm1-1024x931.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/12\/murm1.jpg 1200w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>On pouvait donc logiquement penser qu&#8217;il serait impossible de photographier des aurores polaires au moment de la Super Lune de ce mois de d\u00e9cembre. Quelques astrophotographes motiv\u00e9s nous ont prouv\u00e9 le contraire.<!--more--><\/p>\n<p>D\u00e9but d\u00e9cembre la NOAA (<a href=\"http:\/\/www.noaa.gov\/\" target=\"_blank\" rel=\"noopener\"><em>National Oceanic and Atmospheric Administration<\/em><\/a>) a lanc\u00e9 un avis de temp\u00eate g\u00e9omagn\u00e9tique de\u00a0niveau G1 sur une \u00e9chelle d\u2019intensit\u00e9 qui s\u2019\u00e9chelonne de G1 (mineure) \u00e0 G5 (extr\u00eame). Cette petite temp\u00eate correspondait \u00e0 l&#8217;arriv\u00e9e sur Terre d\u2019une bouff\u00e9e de vent solaire\u00a0(\u00e9chapp\u00e9 d\u2019un trou coronal observ\u00e9 \u00e0 la surface du\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/09\/06\/nouveau-filament-geant-observable-soleil\/\" target=\"_blank\" rel=\"noopener\">Soleil<\/a>).<\/p>\n<p>Les temp\u00eates de niveau G1 n&#8217;ont qu&#8217;un impact mineur sur les installations \u00e9lectriques et \u00e9lectroniques, que ce soit au sol ou \u00e0 bord des avions et des satellites. Elles produisent des aurores qui ne s&#8217;observent qu&#8217;\u00e0 des latitudes \u00e9lev\u00e9es (plus de 60\u00b0).<\/p>\n<p>Au moment de la r\u00e9daction de ces lignes le 6 d\u00e9cembre les pr\u00e9dictions concernant l&#8217;intensification de cette temp\u00eate g\u00e9omagn\u00e9tique et son passage en cat\u00e9gorie G2 n&#8217;ont pas \u00e9t\u00e9 confirm\u00e9es. Les aurores restent donc pour le moment limit\u00e9es aux r\u00e9gions polaires. L&#8217;image ci-dessus, r\u00e9alis\u00e9e par <a href=\"https:\/\/3dmurman.ru\/\" target=\"_blank\" rel=\"noopener\">3D Murman<\/a> depuis la r\u00e9gion de Mourmansk au NORD de la Russie, prouve que la photographie des aurores polaires reste possible malgr\u00e9 l&#8217;\u00e9clat de la Super Lune (remarquez comme le paysage est \u00e9clair\u00e9).<\/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>L&#8217;aveuglante Super Lune du dimanche 3 d\u00e9cembre n&#8217;a pas emp\u00each\u00e9 les aurores d&#8217;illuminer le ciel nordique, pour la plus grande joie des astrophotographes. Sauf s&#8217;ils ont d\u00e9cid\u00e9 de lui tirer le portrait, les astronomes sont nombreux \u00e0 ne pas sortir leurs t\u00e9lescopes au moment de la Pleine Lune. Il faut dire que l&#8217;\u00e9clat de notre &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/12\/06\/de-belles-aurores-polaires-se-deploient-malgre-super-lune\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">De belles aurores polaires se d\u00e9ploient malgr\u00e9 la Super Lune<\/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":8574,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[2387,1136,2386,257,2074,322,1349],"class_list":["post-8572","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-3d-murman","tag-aurore-polaire","tag-mourmansk","tag-noaa","tag-russie","tag-super-lune","tag-tempete-geomagnetique"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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