{"id":21136,"date":"2025-03-10T07:58:02","date_gmt":"2025-03-10T06:58:02","guid":{"rendered":"http:\/\/www.on4cn.be\/blog_radio\/?p=21136"},"modified":"2025-03-10T07:58:02","modified_gmt":"2025-03-10T06:58:02","slug":"un-cir-frappe-la-terre-declenchant-des-aurores","status":"publish","type":"post","link":"http:\/\/www.on4cn.be\/blog_radio\/2025\/03\/10\/un-cir-frappe-la-terre-declenchant-des-aurores\/","title":{"rendered":"UN CIR FRAPPE LA TERRE, D\u00c9CLENCHANT DES AURORES"},"content":{"rendered":"<article class=\"article\">\n<p align='left'><a href=\"https:\/\/spaceweatheralerts.com\/\" target=\"_blank\" rel=\"noopener noreferrer\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/spaceweather.com\/nublokr\/aifreezone_bannerlet.jpg\" width=\"142\" height=\"90\" alt=\"\"><\/a><\/p>\n<p><center><strong><span style=\"color: #ff0000;\"><\/p>\n<h4>UN CIR FRAPPE LA TERRE, D\u00c9CLENCHANT DES AURORES<\/h4>\n<p><\/span><\/strong><\/center><br \/>\n<center><b><span style=\"color: #0000ff;\">Article traduite en Fran\u00e7ais via Google Translate<\/b><\/center><\/p>\n<p><b>Le 10\/03\/2025<\/b><\/p>\n<p>Si vous n&rsquo;avez jamais entendu parler d&rsquo;une <a href=\"https:\/\/www.physics.usyd.edu.au\/~cairns\/teaching\/lecture11\/node4.html\">r\u00e9gion d&rsquo;interaction co-rotative<\/a> (CIR), consid\u00e9rez-la comme une mini-\u00e9jection de masse coronale (CME). L&rsquo;une d&rsquo;elles a frapp\u00e9 la Terre le 8 mars, d\u00e9clenchant plus de <a href=\"https:\/\/spaceweather.com\/images2025\/09mar25\/kindex.jpg\">10 heures<\/a> de temp\u00eates g\u00e9omagn\u00e9tiques. \u00ab\u00a0Les aurores dans le Minnesota \u00e9taient parmi les plus brillantes que j&rsquo;ai vues depuis un moment\u00a0\u00bb, rapporte Anna Eastman, qui a observ\u00e9 le spectacle depuis la r\u00e9serve faunique d&rsquo;Agassiz :<\/p>\n<p align=\"center\"><a href=\"https:\/\/spaceweathergallery2.com\/indiv_upload.php?upload_id=220845\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/spaceweather.com\/images2025\/09mar25\/mn_strip.jpg\" width=\"520\" height=\"577\" alt=\"\"><\/a><\/p>\n<p align=\"left\">\u00ab\u00a0M\u00eame avec une Lune brillante, c&rsquo;\u00e9tait un magnifique spectacle de lumi\u00e8res\u00a0\u00bb, dit-elle.<\/p>\n<p align=\"left\">Les CIR sont des zones de transition entre des flux de vent solaire rapides et lents. Elles contiennent des champs magn\u00e9tiques et des ondes de choc similaires \u00e0 celles des <a href=\"https:\/\/www.swpc.noaa.gov\/phenomena\/coronal-mass-ejections\">CME<\/a>. Alors que les CME n\u00e9cessitent une explosion sur le Soleil, les CIR n&rsquo;en ont pas besoin. Elles se forment lentement par compression des flux de vent solaire, sans \u00e9ruption solaire requise.<\/p>\n<p align=\"left\">L&rsquo;arriv\u00e9e du CIR le 8 mars a imm\u00e9diatement provoqu\u00e9 une temp\u00eate de classe <a href=\"https:\/\/spaceweather.com\/glossary\/g1.jpg\">G1<\/a> (Mineure), qui s&rsquo;est intensifi\u00e9e en cat\u00e9gorie <a href=\"https:\/\/spaceweather.com\/glossary\/g2.jpg\">G2<\/a> (Mod\u00e9r\u00e9e) le 9 mars. Des observateurs du ciel en Islande, au Canada et dans plusieurs \u00c9tats am\u00e9ricains, de <a href=\"https:\/\/spaceweathergallery2.com\/indiv_upload.php?upload_id=220833\">New York<\/a> \u00e0 <a href=\"https:\/\/spaceweathergallery2.com\/indiv_upload.php?upload_id=220848\">l&rsquo;Utah<\/a>, ont vu la lueur g\u00e9omagn\u00e9tique.<\/p>\n<p align=\"center\"><a href=\"https:\/\/www.physics.usyd.edu.au\/~cairns\/teaching\/lecture11\/node4.html\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/spaceweather.com\/images2025\/09mar25\/kindex2_strip2b.jpg\" width=\"520\" height=\"276\" alt=\"\"><\/a><br \/>\nCliquez sur le sch\u00e9ma pour <a href=\"https:\/\/www.physics.usyd.edu.au\/~cairns\/teaching\/lecture11\/node4.html\">en savoir plus sur les CIR<\/a>.<\/p>\n<p align=\"left\">Un flux rapide de vent solaire est arriv\u00e9 juste apr\u00e8s le CIR. C&rsquo;est le m\u00eame flux qui a cr\u00e9\u00e9 le CIR en premier lieu en comprimant une r\u00e9gion de vent solaire plus lent devant lui. Soufflant \u00e0 600 km\/s, ce flux rapide pourrait provoquer des temp\u00eates de cat\u00e9gorie <a href=\"https:\/\/spaceweather.com\/glossary\/g1.jpg\">G1<\/a> (Mineure) le 10 mars. Les observateurs du ciel en haute latitude doivent rester vigilants pour voir les aurores. <strong>Alertes aux aurores :<\/strong> <a href=\"https:\/\/spaceweatheralerts.com\">SMS Texte<\/a>.<\/p>\n<p>Info de la Source Publi\u00e9 <a href=\"https:\/\/spaceweather.com\/\" target=\"_blank\" rel=\"noopener noreferrer\"><b><span style=\"color: #ff0000;\"> * ICI<\/span><\/b><\/a><\/p>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>UN CIR FRAPPE LA TERRE, D\u00c9CLENCHANT DES AURORES Article traduite en Fran\u00e7ais via Google Translate Le 10\/03\/2025 Si vous n&rsquo;avez jamais entendu parler d&rsquo;une r\u00e9gion d&rsquo;interaction co-rotative (CIR), consid\u00e9rez-la comme une mini-\u00e9jection de masse coronale (CME). L&rsquo;une d&rsquo;elles a frapp\u00e9 la Terre le 8 mars, d\u00e9clenchant plus de 10 heures de temp\u00eates g\u00e9omagn\u00e9tiques. \u00ab\u00a0Les aurores &hellip; <a href=\"http:\/\/www.on4cn.be\/blog_radio\/2025\/03\/10\/un-cir-frappe-la-terre-declenchant-des-aurores\/\" class=\"more-link\">Continuer la lecture<span class=\"screen-reader-text\"> de &laquo;&nbsp;UN CIR FRAPPE LA TERRE, D\u00c9CLENCHANT DES AURORES&nbsp;&raquo;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35,24,25],"tags":[],"class_list":["post-21136","post","type-post","status-publish","format-standard","hentry","category-info","category-trafic-radio","category-trafic-radioamatuer"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.5 - aioseo.com -->\n\t<meta name=\"description\" content=\"UN CIR FRAPPE LA TERRE, D\u00c9CLENCHANT DES AURORES Article traduite en Fran\u00e7ais via Google Translate Le 10\/03\/2025 Si vous n&#039;avez jamais entendu parler d&#039;une r\u00e9gion d&#039;interaction co-rotative (CIR), consid\u00e9rez-la comme une mini-\u00e9jection de masse coronale (CME). L&#039;une d&#039;elles a frapp\u00e9 la Terre le 8 mars, d\u00e9clenchant plus de 10 heures de temp\u00eates g\u00e9omagn\u00e9tiques. &quot;Les aurores\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"4cn_admin\"\/>\n\t<link rel=\"canonical\" href=\"http:\/\/www.on4cn.be\/blog_radio\/2025\/03\/10\/un-cir-frappe-la-terre-declenchant-des-aurores\/\" \/>\n\t\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.5\" \/>\n\t\t<meta property=\"og:locale\" content=\"fr_FR\" \/>\n\t\t<meta property=\"og:site_name\" content=\"ON4CN - Claude - OT4N - Claude Station Radioamateur\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"UN CIR FRAPPE LA TERRE, D\u00c9CLENCHANT DES AURORES - ON4CN - Claude - OT4N\" \/>\n\t\t<meta property=\"og:description\" content=\"UN CIR FRAPPE LA TERRE, D\u00c9CLENCHANT DES AURORES Article traduite en Fran\u00e7ais via Google Translate Le 10\/03\/2025 Si vous n&#039;avez jamais entendu parler d&#039;une r\u00e9gion d&#039;interaction co-rotative (CIR), consid\u00e9rez-la comme une mini-\u00e9jection de masse coronale (CME). 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