{"id":22072,"date":"2026-02-05T19:20:44","date_gmt":"2026-02-05T18:20:44","guid":{"rendered":"https:\/\/reperes-astro.fr\/?p=22072"},"modified":"2026-02-05T20:07:15","modified_gmt":"2026-02-05T19:07:15","slug":"aurores-boreales-en-savoir-plus","status":"publish","type":"post","link":"https:\/\/reperes-astro.fr\/aurores-boreales-en-savoir-plus\/","title":{"rendered":"AURORES BOREALES : en savoir plus"},"content":{"rendered":"\n<h2 class=\"wp-block-heading has-medium-font-size\"><strong>Les couleurs des Aurores Bor\u00e9ales :<\/strong><\/h2>\n\n\n\n<p>Rappel : la collision entre le vent solaire et les gaz de l&rsquo;atmosph\u00e8re terrestre fabrique la lumi\u00e8re des aurores. Les particules du vent solaire &#8211; \u00e9lectrons et protons &#8211; excitent les atomes et les mol\u00e9cules de l&rsquo;atmosph\u00e8re qui perdent des \u00e9lectrons  et lib\u00e8rent de l&rsquo;\u00e9nergie en \u00e9mettant un photon qui est une particule de lumi\u00e8re<\/p>\n\n\n\n<p>LES COULEURS de cette lumi\u00e8re d\u00e9pend :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>de l&rsquo;altitude des collisions (entre 40 et 400km),<\/li>\n\n\n\n<li>de la composition de l&rsquo;atmosph\u00e8re,<\/li>\n\n\n\n<li>de la densit\u00e9 de l&rsquo;atmosph\u00e8re,<\/li>\n\n\n\n<li>de de la quantit\u00e9 d&rsquo;\u00e9nergie \u00e9mise.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>au plus bas, de 40 \u00e0 80 km d&rsquo;altitude, c&rsquo;est le royaume du DIOXYGENE et du DIAZOTE.<\/li>\n\n\n\n<li>de 80 \u00e0 200 kilom\u00e8tres d&rsquo;altitude, il y a de l&rsquo;oxyg\u00e8ne atomique (celui qui ne contient qu&rsquo;un atome ) et encore du diazote.<\/li>\n\n\n\n<li>au dessus de 200km il y a de nouveau beaucoup de dioxyg\u00e8ne et encore un peu de diazote.<\/li>\n<\/ul>\n\n\n\n<p>Ces \u00e9l\u00e9ments chimiques sont les plus r\u00e9pandus dans l&rsquo;atmosph\u00e8re, c&rsquo;est eux qui vont \u00ab\u00a0fabriquer\u00a0\u00bb les couleurs des aurores.<\/p>\n\n\n\n<p>Le VERT est la couleur dominante :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Parce que l&rsquo;oeil humain est tr\u00e8s sensible \u00e0 cette couleur<\/li>\n\n\n\n<li>parce qu&rsquo;il est li\u00e9 aux collision d&rsquo;oxyg\u00e8ne atomique le plus visible sous l&rsquo;ovale auroral<\/li>\n<\/ul>\n\n\n\n<p>LE ROUGE est li\u00e9 aux collisions avec l&rsquo;oxyg\u00e8ne aux hautes latitudes.<\/p>\n\n\n\n<p>LE ROUGE est donc toujours plus haut que le vert.<\/p>\n\n\n\n<p>La ROUGE \u00e0 l&rsquo;oeil nu est peu visible voire un peu gris mais on peut le voir lors des fortes intensit\u00e9s. Votre appareil photo en pose longue les mettra en \u00e9vidence.<\/p>\n\n\n\n<p>A NOS LATITUDES avec la rotondit\u00e9 de la TERRE nous voyons le \u00ab\u00a0haut\u00a0\u00bb des aurores donc le ROUGE. (photos de St\u00e9phane Losacco prises le 10 mai 2024 \u00e0 l&rsquo;observatoire).<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><a href=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/01\/20240511-XS10-075.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"682\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/01\/20240511-XS10-075-1024x682.jpg\" alt=\"AURORES BOREALES : en savoir plus\" class=\"wp-image-22073\" style=\"width:630px\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/01\/20240511-XS10-075-1024x682.jpg 1024w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/01\/20240511-XS10-075-300x200.jpg 300w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/01\/20240511-XS10-075-768x512.jpg 768w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/01\/20240511-XS10-075-1536x1024.jpg 1536w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/01\/20240511-XS10-075-2048x1365.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p>Mais une bande verte peut quand m\u00eame apparaitre sous le rouge lors fortes aurores<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><a href=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/01\/20240511-XS10-102.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"682\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/01\/20240511-XS10-102-1024x682.jpg\" alt=\"AURORES BOREALES : en savoir plus\" class=\"wp-image-22074\" style=\"width:630px\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/01\/20240511-XS10-102-1024x682.jpg 1024w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/01\/20240511-XS10-102-300x200.jpg 300w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/01\/20240511-XS10-102-768x512.jpg 768w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/01\/20240511-XS10-102-1536x1024.jpg 1536w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/01\/20240511-XS10-102-2048x1365.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p>DU ROSE peut aussi apparaitre li\u00e9 au diazote.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-medium is-resized\"><a href=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/01\/20240511-XS10-099.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"200\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/01\/20240511-XS10-099-300x200.jpg\" alt=\"AURORES BOREALES : en savoir plus\" class=\"wp-image-22075\" style=\"width:630px\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/01\/20240511-XS10-099-300x200.jpg 300w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/01\/20240511-XS10-099-1024x682.jpg 1024w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/01\/20240511-XS10-099-768x512.jpg 768w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/01\/20240511-XS10-099-1536x1024.jpg 1536w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/01\/20240511-XS10-099-2048x1365.jpg 2048w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p>2022 en Islande pr\u00e8s du volcan de Jules Verne, le rouge \u00e9tait visible \u00e0 l&rsquo;\u0153il nu.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/01\/IMG_2570.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"320\" height=\"212\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/01\/IMG_2570.jpg\" alt=\"AURORES BOREALES : en savoir plus\" class=\"wp-image-22077\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/01\/IMG_2570.jpg 320w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2026\/01\/IMG_2570-300x199.jpg 300w\" sizes=\"auto, (max-width: 320px) 100vw, 320px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p><\/p>\n<div class=\"pvc_clear\"><\/div><p id=\"pvc_stats_22072\" class=\"pvc_stats all  \" data-element-id=\"22072\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" 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12.8-12.8V140.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v198.4c0 6.4 6.4 12.8 12.8 12.8zm96 0h22.4c6.4 0 12.8-6.4 12.8-12.8V204.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v134.4c0 6.4 6.4 12.8 12.8 12.8zM496 400H48V80c0-8.84-7.16-16-16-16H16C7.16 64 0 71.16 0 80v336c0 17.67 14.33 32 32 32h464c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16zm-387.2-48h22.4c6.4 0 12.8-6.4 12.8-12.8v-70.4c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v70.4c0 6.4 6.4 12.8 12.8 12.8z\" class=\"\"><\/path><\/svg><\/i> <img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"16\" alt=\"Loading\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/plugins\/page-views-count\/ajax-loader-2x.gif\" border=0 \/><\/p>\n<div class=\"pvc_clear\"><\/div>\n","protected":false},"author":2,"featured_media":21874,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[57,49],"tags":[],"class_list":["post-22072","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aurores-et-autres-evenements","category-informations-a-destination-des-enseignants-et-des-animateurs"],"yoast_head":"<title>AURORES BOREALES : en savoir plus - Rep\u00e8res Astro<\/title>\n<meta name=\"description\" content=\"Rappel : la collision entre le vent solaire et les gaz de l&#039;atmosph\u00e8re terrestre fabrique la lumi\u00e8re des aurores bor\u00e9ales.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/reperes-astro.fr\/aurores-boreales-en-savoir-plus\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" 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