{"id":15387,"date":"2022-01-16T13:11:35","date_gmt":"2022-01-16T13:11:35","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=15387"},"modified":"2022-01-30T11:00:11","modified_gmt":"2022-01-30T11:00:11","slug":"une-tempete-geomagnetique-imprevue-a-touche-la-terre","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/01\/16\/une-tempete-geomagnetique-imprevue-a-touche-la-terre\/","title":{"rendered":"Une temp\u00eate g\u00e9omagn\u00e9tique impr\u00e9vue a touch\u00e9 la Terre"},"content":{"rendered":"<p><strong>Les pr\u00e9visionnistes n&#8217;avaient pas pr\u00e9vu la temp\u00eate g\u00e9omagn\u00e9tique qui a eu lieu ce 14 janvier, pour le plus grand bonheur des observateurs.<\/strong><\/p>\n<h5>Surveillance solaire :<\/h5>\n<p>Les astronomes savent que la formation d&#8217;un<a href=\"https:\/\/www.futura-sciences.com\/sciences\/actualites\/astronomie-immense-trou-coronal-soleil-62947\/\" target=\"_blank\" rel=\"noopener\"> trou coronal<\/a> sur le Soleil s&#8217;accompagne de violentes bouff\u00e9es de vent solaire. Si elles frappent la Terre, ces particules \u00e9nerg\u00e9tiques peuvent provoquer des dysfonctionnements dans les r\u00e9seaux \u00e9lectriques. C&#8217;est pour anticiper ces inconv\u00e9nients que la surveillance de l&#8217;activit\u00e9 solaire existe depuis quelques d\u00e9cennies. Une charge qui incombe \u00e0 la NOAA (<a href=\"http:\/\/www.noaa.gov\/\" target=\"_blank\" rel=\"noopener\"><em>National Oceanic and Atmospheric Administration<\/em><\/a>), qui lance alors un avis de temp\u00eate g\u00e9omagn\u00e9tique. Leur niveau varie de G1 (ph\u00e9nom\u00e8ne mineur) \u00e0 G5 (temp\u00eate extr\u00eame).<\/p>\n<figure id=\"attachment_15388\" aria-describedby=\"caption-attachment-15388\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/aurore_boreale1.jpg\" rel=\"lightbox[15387]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15388\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/aurore_boreale1-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/aurore_boreale1-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/aurore_boreale1-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/aurore_boreale1-768x460.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/aurore_boreale1.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-15388\" class=\"wp-caption-text\">Aurore bor\u00e9ale en Finlande le 14 janvier 2022. La Lune \u00e9claire le paysage. \u00a9 Jari Ylioja<\/figcaption><\/figure>\n<p>Surprenant les pr\u00e9visionnistes, une br\u00e8che s&#8217;est ouverte dans le champ magn\u00e9tique de notre plan\u00e8te le 14 janvier 2022. Le bouclier qui prot\u00e8ge la Terre n&#8217;\u00e9tant plus aussi efficace, le vent solaire a pu s&#8217;engouffrer dans l&#8217;atmosph\u00e8re et y provoquer des aurores.<\/p>\n<h5>Spectacle sous la Lune :<\/h5>\n<p>Vendredi dernier, trois jours avant la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/11\/01\/spectaculaire-pleine-lune-dhalloween-depuis-raritan-bay\/\" target=\"_blank\" rel=\"noopener\">Pleine Lune<\/a>, le ciel nocturne \u00e9tait baign\u00e9 par la lumi\u00e8re de notre satellite naturel. Les astronomes n&#8217;avaient alors plus grand chose \u00e0 observer. Mais le niveau G2 de cette temp\u00eate g\u00e9omagn\u00e9tique a \u00e9t\u00e9 suffisant pour que les aurores bor\u00e9ales fassent une apparition remarqu\u00e9e. Encore fallait-il que des photographes mettent le nez dehors alors qu&#8217;aucune alerte n&#8217;avait \u00e9t\u00e9 lanc\u00e9e. En Finlande, <a href=\"https:\/\/www.facebook.com\/jari.ylioja\" target=\"_blank\" rel=\"noopener\">Jari Ylioja<\/a> a eu la bonne id\u00e9e de sortir et de braver le froid pour immortaliser le spectacle :<\/p>\n<figure id=\"attachment_15389\" aria-describedby=\"caption-attachment-15389\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/aurore_boreale2.jpg\" rel=\"lightbox[15387]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15389\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/aurore_boreale2-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/aurore_boreale2-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/aurore_boreale2-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/aurore_boreale2-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/aurore_boreale2.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-15389\" class=\"wp-caption-text\">Malgr\u00e9 la Lune, l&#8217;aurore \u00e9tait bien visible en Finlande ce 14 janvier 2022. \u00a9 Jari Ylioja<\/figcaption><\/figure>\n<p>Le ciel s&#8217;est par\u00e9 de magnifiques couleurs vertes et rouges un peu partout en Europe du Nord et jusqu&#8217;en Allemagne, o\u00f9 <a href=\"https:\/\/spaceweathergallery.com\/indiv_upload.php?upload_id=181584\" target=\"_blank\" rel=\"noopener\">Laura Kranich<\/a> en a \u00e9galement profit\u00e9. Bien que le <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/09\/06\/le-soleil-se-reveille-les-taches-se-multiplient-a-sa-surface\/\" target=\"_blank\" rel=\"noopener\">maximum de l&#8217;activit\u00e9 solaire<\/a> ne soit pas attendu avant 2025, il semble que le r\u00e9veil de notre \u00e9toile ne fasse plus aucun doute !<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/11\/13\/lactivite-solaire-reprend-les-aurores-polaires-sintensifient\/\" target=\"_blank\" rel=\"noopener\">L&#8217;activit\u00e9 solaire reprend, les aurores polaires s&#8217;intensifient<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/11\/07\/derniere-magnifique-aurore-boreale-pour-thomas-pesquet\/\" target=\"_blank\" rel=\"noopener\">Derni\u00e8re (magnifique) aurore bor\u00e9ale pour Thomas Pesquet<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/07\/11\/un-pilote-de-ligne-filme-la-danse-des-aurores-boreales\/\" target=\"_blank\" rel=\"noopener\">Un pilote de ligne filme la danse des aurores bor\u00e9ales<\/a><\/li>\n<\/ul>\n<p>Suivez l\u2019actualit\u00e9 astronomique et d\u00e9couvrez mes images du ciel en vous abonnant \u00e0 Cielmania sur\u00a0<a href=\"https:\/\/www.facebook.com\/cielmania\/\" target=\"_blank\" rel=\"noopener noreferrer\">Facebook<\/a>\u00a0ou\u00a0<a href=\"https:\/\/twitter.com\/cielmania\" target=\"_blank\" rel=\"noopener noreferrer\">Twitter<\/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 pr\u00e9visionnistes n&#8217;avaient pas pr\u00e9vu la temp\u00eate g\u00e9omagn\u00e9tique qui a eu lieu ce 14 janvier, pour le plus grand bonheur des observateurs. Surveillance solaire : Les astronomes savent que la formation d&#8217;un trou coronal sur le Soleil s&#8217;accompagne de violentes bouff\u00e9es de vent solaire. Si elles frappent la Terre, ces particules \u00e9nerg\u00e9tiques peuvent provoquer des &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/01\/16\/une-tempete-geomagnetique-imprevue-a-touche-la-terre\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Une temp\u00eate g\u00e9omagn\u00e9tique impr\u00e9vue a touch\u00e9 la Terre<\/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":15389,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[1231,3160,1349],"class_list":["post-15387","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-finlande","tag-jari-ylioja","tag-tempete-geomagnetique"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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