{"id":363,"date":"2014-02-12T11:54:56","date_gmt":"2014-02-12T11:54:56","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/luminet\/?p=363"},"modified":"2014-04-22T09:15:55","modified_gmt":"2014-04-22T09:15:55","slug":"le-soleil-dans-ses-etats","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/luminet\/2014\/02\/12\/le-soleil-dans-ses-etats\/","title":{"rendered":"Le Soleil dans tous ses \u00e9tats"},"content":{"rendered":"<p style=\"text-align: justify\">L&#8217;observatoire solaire <a title=\"Solar Dynamics Observatory\" href=\"http:\/\/sdo.gsfc.nasa.gov\/\" target=\"_blank\">SDO (<i>Solar Dynamics Observatory<\/i>)<\/a>, mis en orbite par la NASA il y a quatre ans, observe et photographie le Soleil en continu au rythme de 4800 images par heure.\u00a0 L&#8217;extraordinaire vid\u00e9o qui suit montre en acc\u00e9l\u00e9r\u00e9 l&#8217;activit\u00e9 f\u00e9brile de notre \u00e9toile &#8211; taches solaires, \u00e9ruptions, protub\u00e9rances &#8211; au cours des douze derniers mois &#8211; 2013 fut en effet l&#8217;ann\u00e9e du maximum d&#8217;activit\u00e9 solaire dans son pr\u00e9sent cycle d&#8217;activit\u00e9 de 11 ans.<\/p>\n<p dir=\"ltr\">\n<!-- iframe plugin v.5.1 wordpress.org\/plugins\/iframe\/ -->\n<iframe loading=\"lazy\" width=\"450\" height=\"253\" src=\"\/\/www.youtube.com\/embed\/NAg4qXsk99c\" frameborder=\"0\" 0=\"allowfullscreen\" scrolling=\"yes\" class=\"iframe-class\"><\/iframe>\n<\/p>\n<address style=\"text-align: justify\"><em>Il a fallu les observations combin\u00e9es des trois instruments du t\u00e9lescope SDO et l&#8217;addition de vingt-cinq images individuelles pour mettre en \u00e9vidence les r\u00e9gions les plus turbulentes de notre \u00e9toile.<\/em><br \/>\n<em> \u00a9 NASA\/GSFC\/SDO\/S. Wiessinger<\/em><\/address>\n<h5 style=\"text-align: justify\">Pour mieux comprendre cette vid\u00e9o, voici quelques rappels simples.<\/h5>\n<p style=\"text-align: justify\"><!--more-->Le Soleil a une atmosph\u00e8re, et m\u00eame plusieurs. En effet le Soleil ne \u00ab\u00a0s\u2019arr\u00eate\u00a0\u00bb pas \u00e0 sa surface visible de couleur jaune, appel\u00e9e <strong>photosph\u00e8re<\/strong>, dont la temp\u00e9rature est d\u2019environ 6000 \u00b0C. Au-dessus s\u2019\u00e9tend la <strong>chromosph\u00e8re<\/strong>, de couleur rouge, r\u00e9gion de transition dans laquelle se d\u00e9ploient les \u00e9ruptions et les protub\u00e9rances solaires. Aliment\u00e9es par les champs magn\u00e9tiques du Soleil, certaines protub\u00e9rances forment des arches gigantesques dans l\u2019espace, embrassant des centaines de milliers de kilom\u00e8tres. Plus loin encore s\u2019\u00e9tend la <strong>couronne<\/strong>, une vaste r\u00e9gion sans limite d\u00e9finie, qui devient visible lors des \u00e9clipses totales de Soleil et dans certains domaines de longueur d\u2019onde. Bien que constitu\u00e9e de gaz tr\u00e8s rar\u00e9fi\u00e9s, la couronne est beaucoup plus chaude que la chromosph\u00e8re et la photosph\u00e8re situ\u00e9es en dessous. Sa temp\u00e9rature remonte en effet \u00e0 plusieurs millions de degr\u00e9s, ce qui t\u00e9moigne de fa\u00e7on spectaculaire de l\u2019\u00e9nergie que notre \u00e9toile exp\u00e9die en permanence dans l\u2019espace. On y observe des boucles de gaz incurv\u00e9es le long des lignes du champ magn\u00e9tique, qui peuvent mesurer 30 fois le diam\u00e8tre de la Terre.<\/p>\n<figure id=\"attachment_370\" aria-describedby=\"caption-attachment-370\" style=\"width: 150px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/blogs.futura-sciences.com\/luminet\/wp-content\/uploads\/sites\/2\/2014\/02\/Solar-granule-BBSO.jpg\" rel=\"lightbox[363]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-thumbnail wp-image-370 \" src=\"https:\/\/blogs.futura-sciences.com\/luminet\/wp-content\/uploads\/sites\/2\/2014\/02\/Solar-granule-BBSO-150x150.jpg\" alt=\"Granulation solaire photographi\u00e9e au Big Baer Solar Observatory\" width=\"150\" height=\"150\" srcset=\"https:\/\/blogs.futura-sciences.com\/luminet\/wp-content\/uploads\/sites\/2\/2014\/02\/Solar-granule-BBSO-150x150.jpg 150w, https:\/\/blogs.futura-sciences.com\/luminet\/wp-content\/uploads\/sites\/2\/2014\/02\/Solar-granule-BBSO-300x300.jpg 300w, https:\/\/blogs.futura-sciences.com\/luminet\/wp-content\/uploads\/sites\/2\/2014\/02\/Solar-granule-BBSO.jpg 400w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a><figcaption id=\"caption-attachment-370\" class=\"wp-caption-text\">Granulation solaire photographi\u00e9e au Big Baer Solar Observatory<\/figcaption><\/figure>\n<p style=\"text-align: justify\">Ces lignes de champ prennent leur origine dans la photosph\u00e8re. Cette derni\u00e8re est comme une marmite en \u00e9bullition dont chaque bulle, appel\u00e9e <strong>granule<\/strong>, est aussi grande que la France. Le gaz s\u2019\u00e9l\u00e8ve \u00e0 travers ces granules, puis refroidit et redescend le long des lignes de s\u00e9paration.<\/p>\n<p style=\"text-align: justify\">La photosph\u00e8re\u00a0montre aussi des <strong>taches sombres<\/strong> ressemblant \u00e0 de gigantesques tournesols qui pourraient avaler la Terre enti\u00e8re. Leur temp\u00e9rature, de l\u2019ordre de 4000 degr\u00e9s, est inf\u00e9rieure \u00e0 celle des r\u00e9gions environnantes, c\u2019est ce contraste qui les fait para\u00eetre noires. Ce sont des centres d\u2019activit\u00e9 magn\u00e9tique, sortes d\u2019aimants \u00e0 partir desquels les lignes de force magn\u00e9tique s&#8217;\u00e9chappent de la surface du Soleil et s&#8217;y reconnectent. Les taches sont \u00e0 l\u2019origine des \u00e9ruptions et des protub\u00e9rances solaires.<\/p>\n<figure id=\"attachment_371\" aria-describedby=\"caption-attachment-371\" style=\"width: 300px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blogs.futura-sciences.com\/luminet\/wp-content\/uploads\/sites\/2\/2014\/02\/tache-sombre.jpg\" rel=\"lightbox[363]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-371 \" src=\"https:\/\/blogs.futura-sciences.com\/luminet\/wp-content\/uploads\/sites\/2\/2014\/02\/tache-sombre-300x300.jpg\" alt=\"tache-sombre\" width=\"300\" height=\"300\" srcset=\"https:\/\/blogs.futura-sciences.com\/luminet\/wp-content\/uploads\/sites\/2\/2014\/02\/tache-sombre-300x300.jpg 300w, https:\/\/blogs.futura-sciences.com\/luminet\/wp-content\/uploads\/sites\/2\/2014\/02\/tache-sombre-150x150.jpg 150w, https:\/\/blogs.futura-sciences.com\/luminet\/wp-content\/uploads\/sites\/2\/2014\/02\/tache-sombre.jpg 568w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-371\" class=\"wp-caption-text\">Tache solaire observ\u00e9e par le satellite SOHO. Ne dirait-on pas un tournesol peint par Vincent Van Gogh? Cr\u00e9dit : ESA\/NASA<\/figcaption><\/figure>\n<p style=\"text-align: justify\">Les taches solaires apparaissent par groupes. Elles peuvent grandir en quelques heures et dispara\u00eetre en quelques mois. Leur nombre et la surface qu\u2019elles occupent \u00e0 un moment donn\u00e9 indiquent la mesure de l\u2019activit\u00e9 de notre \u00e9toile. A certains moments, le Soleil nous pr\u00e9sente une face tach\u00e9e, \u00e0 d\u2019autres, on n\u2019en d\u00e9c\u00e8le aucune. L\u2019activit\u00e9\u00a0 solaire n\u2019est donc pas constante au cours du temps. Elle ob\u00e9it \u00e0 un cycle de 11 ans. Au d\u00e9but d\u2019un <strong>cycle solaire<\/strong>, les taches apparaissent aux latitudes \u00e9lev\u00e9es et se rapprochent de l\u2019\u00e9quateur. L\u2019activit\u00e9 magn\u00e9tique atteint alors son maximum. A la fin, les taches disparaissent et le cycle suivant commence. Chaque nouveau cycle est d\u00fb \u00e0 la r\u00e9g\u00e9n\u00e9ration du champ magn\u00e9tique \u00e0 l\u2019int\u00e9rieur du soleil. C\u2019est une sorte de dynamo g\u00e9ante qui s\u2019entretient toute seule.<\/p>\n<figure id=\"attachment_372\" aria-describedby=\"caption-attachment-372\" style=\"width: 150px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/blogs.futura-sciences.com\/luminet\/wp-content\/uploads\/sites\/2\/2014\/02\/Soho2008-Soleilsanstache.jpg\" rel=\"lightbox[363]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-thumbnail wp-image-372    \" src=\"https:\/\/blogs.futura-sciences.com\/luminet\/wp-content\/uploads\/sites\/2\/2014\/02\/Soho2008-Soleilsanstache-150x150.jpg\" alt=\"Soho2008-Soleilsanstache\" width=\"150\" height=\"150\" srcset=\"https:\/\/blogs.futura-sciences.com\/luminet\/wp-content\/uploads\/sites\/2\/2014\/02\/Soho2008-Soleilsanstache-150x150.jpg 150w, https:\/\/blogs.futura-sciences.com\/luminet\/wp-content\/uploads\/sites\/2\/2014\/02\/Soho2008-Soleilsanstache-300x300.jpg 300w, https:\/\/blogs.futura-sciences.com\/luminet\/wp-content\/uploads\/sites\/2\/2014\/02\/Soho2008-Soleilsanstache.jpg 450w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a><figcaption id=\"caption-attachment-372\" class=\"wp-caption-text\">Un Soleil immacul\u00e9 : ann\u00e9e 2001, minimum d&#8217;activit\u00e9 solaire.<br \/>Cr\u00e9dit : ESA\/NASA (SOHO)<\/figcaption><\/figure>\n<figure id=\"attachment_369\" aria-describedby=\"caption-attachment-369\" style=\"width: 150px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/blogs.futura-sciences.com\/luminet\/wp-content\/uploads\/sites\/2\/2014\/02\/soho2001-taches.jpg\" rel=\"lightbox[363]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-thumbnail wp-image-369  \" src=\"https:\/\/blogs.futura-sciences.com\/luminet\/wp-content\/uploads\/sites\/2\/2014\/02\/soho2001-taches-150x150.jpg\" alt=\"soho2001-taches\" width=\"150\" height=\"150\" srcset=\"https:\/\/blogs.futura-sciences.com\/luminet\/wp-content\/uploads\/sites\/2\/2014\/02\/soho2001-taches-150x150.jpg 150w, https:\/\/blogs.futura-sciences.com\/luminet\/wp-content\/uploads\/sites\/2\/2014\/02\/soho2001-taches-300x300.jpg 300w, https:\/\/blogs.futura-sciences.com\/luminet\/wp-content\/uploads\/sites\/2\/2014\/02\/soho2001-taches.jpg 450w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a><figcaption id=\"caption-attachment-369\" class=\"wp-caption-text\">Un Soleil macul\u00e9: ann\u00e9e 2008, maximum d&#8217;activit\u00e9 solaire. Cr\u00e9dit : ESA\/NASA (SOHO)<\/figcaption><\/figure>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><em>\u00a0<\/em><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Suite \u00e0 venir : <a title=\"Le royaume magn\u00e9tique du Soleil\" href=\"https:\/\/blogs.futura-sciences.com\/luminet\/2014\/03\/21\/le-royaume-magnetique-du-soleil\/\" target=\"_blank\">le royaume magn\u00e9tique du Soleil<\/a><\/strong><\/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;observatoire solaire SDO (Solar Dynamics Observatory), mis en orbite par la NASA il y a quatre ans, observe et photographie le Soleil en continu au rythme de 4800 images par heure.\u00a0 L&#8217;extraordinaire vid\u00e9o qui suit montre en acc\u00e9l\u00e9r\u00e9 l&#8217;activit\u00e9 f\u00e9brile de notre \u00e9toile &#8211; taches solaires, \u00e9ruptions, protub\u00e9rances &#8211; au cours des douze derniers mois &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/luminet\/2014\/02\/12\/le-soleil-dans-ses-etats\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Le Soleil dans tous ses \u00e9tats<\/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":2,"featured_media":377,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[15,4],"tags":[60,259,59],"class_list":["post-363","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","category-sciences","tag-activite-solaire","tag-astronomie","tag-soleil"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Le Soleil dans tous ses \u00e9tats, par Jean-Pierre Luminet<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.futura-sciences.com\/luminet\/2014\/02\/12\/le-soleil-dans-ses-etats\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Le Soleil dans tous ses \u00e9tats, par Jean-Pierre Luminet\" \/>\n<meta property=\"og:description\" content=\"L&#8217;observatoire solaire SDO (Solar Dynamics Observatory), mis en orbite par la NASA il y a quatre ans, observe et photographie le Soleil en continu au rythme de 4800 images par heure.\u00a0 L&#8217;extraordinaire vid\u00e9o qui suit montre en acc\u00e9l\u00e9r\u00e9 l&#8217;activit\u00e9 f\u00e9brile de notre \u00e9toile &#8211; taches solaires, \u00e9ruptions, protub\u00e9rances &#8211; au cours des douze derniers mois &hellip; Continuer la lecture de Le Soleil dans tous ses \u00e9tats &rarr;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blogs.futura-sciences.com\/luminet\/2014\/02\/12\/le-soleil-dans-ses-etats\/\" \/>\n<meta property=\"og:site_name\" content=\"LUMINESCIENCES : le blog de Jean-Pierre LUMINET, astrophysicien\" \/>\n<meta property=\"article:published_time\" content=\"2014-02-12T11:54:56+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2014-04-22T09:15:55+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blogs.futura-sciences.com\/luminet\/wp-content\/uploads\/sites\/2\/2014\/02\/Le-Soleil-et-sa-couronne.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1100\" \/>\n\t<meta property=\"og:image:height\" content=\"1100\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Jean-Pierre LUMINET\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Jean-Pierre LUMINET\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/luminet\/2014\/02\/12\/le-soleil-dans-ses-etats\/\",\"url\":\"https:\/\/blogs.futura-sciences.com\/luminet\/2014\/02\/12\/le-soleil-dans-ses-etats\/\",\"name\":\"Le Soleil dans tous ses \u00e9tats, par Jean-Pierre Luminet\",\"isPartOf\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/luminet\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/luminet\/2014\/02\/12\/le-soleil-dans-ses-etats\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/luminet\/2014\/02\/12\/le-soleil-dans-ses-etats\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blogs.futura-sciences.com\/luminet\/wp-content\/uploads\/sites\/2\/2014\/02\/Le-Soleil-et-sa-couronne.jpg\",\"datePublished\":\"2014-02-12T11:54:56+00:00\",\"dateModified\":\"2014-04-22T09:15:55+00:00\",\"author\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/luminet\/#\/schema\/person\/d61f577b54398f0ecee81e140e7643cb\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/blogs.futura-sciences.com\/luminet\/2014\/02\/12\/le-soleil-dans-ses-etats\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/luminet\/2014\/02\/12\/le-soleil-dans-ses-etats\/#primaryimage\",\"url\":\"https:\/\/blogs.futura-sciences.com\/luminet\/wp-content\/uploads\/sites\/2\/2014\/02\/Le-Soleil-et-sa-couronne.jpg\",\"contentUrl\":\"https:\/\/blogs.futura-sciences.com\/luminet\/wp-content\/uploads\/sites\/2\/2014\/02\/Le-Soleil-et-sa-couronne.jpg\",\"width\":1100,\"height\":1100},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/luminet\/#website\",\"url\":\"https:\/\/blogs.futura-sciences.com\/luminet\/\",\"name\":\"LUMINESCIENCES : le blog de Jean-Pierre LUMINET, astrophysicien\",\"description\":\"J\u2019eus le vertige et je pleurai car mes yeux avaient vu cet objet secret et conjectural dont les hommes usurpent le nom, mais qu\u2019aucun homme n\u2019a regard\u00e9 : l\u2019inconcevable univers.  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