{"id":12806,"date":"2020-11-04T09:57:59","date_gmt":"2020-11-04T09:57:59","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=12806"},"modified":"2020-11-13T17:13:41","modified_gmt":"2020-11-13T17:13:41","slug":"la-premiere-tache-geante-du-nouveau-cycle-solaire-est-apparue","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/11\/04\/la-premiere-tache-geante-du-nouveau-cycle-solaire-est-apparue\/","title":{"rendered":"La premi\u00e8re tache g\u00e9ante du nouveau cycle solaire est apparue"},"content":{"rendered":"<p><strong>Les observateurs du Soleil savourent l&#8217;arriv\u00e9e du premier grand groupe de taches. Le 25e cycle solaire est bel et bien lanc\u00e9.<\/strong><\/p>\n<h5>Une histoire de magn\u00e9tisme :<\/h5>\n<p>Les taches solaires sont des zones sombres (moins chaudes) qui apparaissent r\u00e9guli\u00e8rement \u00e0 la surface de notre \u00e9toile. Elles trahissent une intense activit\u00e9 magn\u00e9tique. Il semble que la plus ancienne observation av\u00e9r\u00e9e de taches solaires soit chinoise et remonte \u00e0 l&#8217;an -28. <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/01\/06\/galilee-le-savant-qui-a-ouvert-nos-yeux-sur-lunivers\/\" target=\"_blank\" rel=\"noopener noreferrer\">Galil\u00e9e<\/a> fut le premier \u00e0 les observer en 1612 avec une <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/05\/05\/bien-choisir-sa-premiere-lunette-astronomique\/\" target=\"_blank\" rel=\"noopener noreferrer\">lunette astronomique<\/a>. La p\u00e9riodicit\u00e9 de l&#8217;apparition de ces taches fut \u00e9voqu\u00e9e par Heinrich Schwabe en 1848. Puis Rudolph Wolf d\u00e9termina la dur\u00e9e moyenne d&#8217;un cycle solaire : environ 11 ans.<\/p>\n<figure id=\"attachment_12807\" aria-describedby=\"caption-attachment-12807\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/11\/Giuseppe-Petricca.jpg\" rel=\"lightbox[12806]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-12807\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/11\/Giuseppe-Petricca-450x305.jpg\" alt=\"\" width=\"450\" height=\"305\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/11\/Giuseppe-Petricca-450x305.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/11\/Giuseppe-Petricca.jpg 730w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-12807\" class=\"wp-caption-text\">Le groupe de taches solaires AR 2781 photographi\u00e9 le 3 novembre. Ce groupe est le plus important du nouveau cycle solaire. La Terre donne l&#8217;\u00e9chelle. \u00a9 Giuseppe Petricca<\/figcaption><\/figure>\n<p>Ces taches sont num\u00e9rot\u00e9es dans l\u2019ordre d\u2019apparition par la\u00a0<a href=\"http:\/\/www.noaa.gov\/\" target=\"_blank\" rel=\"noopener noreferrer\">NOAA<\/a>, (<em>National Oceanic and Atmospheric Administration<\/em>), le num\u00e9ro \u00e9tant pr\u00e9c\u00e9d\u00e9 par les lettres AR qui signifient\u00a0<em>Active Region<\/em>.<!--more--><\/p>\n<h5>Nouveau cycle :<\/h5>\n<p>En d\u00e9cembre 2019 les astronomes ont constat\u00e9 que le <a href=\"https:\/\/www.futura-sciences.com\/sciences\/breves\/soleil-explosions-magnetiques-inconnues-surface-soleil-1700\/\" target=\"_blank\" rel=\"noopener noreferrer\">magn\u00e9tisme du Soleil<\/a> avait chang\u00e9 de polarit\u00e9. Une inversion qui annonce le d\u00e9but d&#8217;un nouveau cycle solaire, le 25e, dont le maximum est pr\u00e9vu pour 2025. Ce 3 novembre est apparu le premier grand groupe de taches de ce nouveau cycle. Il porte le num\u00e9ro AR 2781. Vous pourrez suivre sans danger l\u2019\u00e9volution de ce groupe sur la page des satellites solaires <a href=\"http:\/\/sohowww.nascom.nasa.gov\/sunspots\/\" target=\"_blank\" rel=\"noopener noreferrer\">SOHO\u00a0<\/a>(<em>SOlar and Heliospheric Observatory<\/em>) ou\u00a0<a href=\"http:\/\/sdo.gsfc.nasa.gov\/\" target=\"_blank\" rel=\"noopener noreferrer\">SDO\u00a0<\/a>(<em>Solar Dynamics Observatory<\/em>). Il devrait \u00eatre observable pendant deux semaines. C&#8217;est en effet le temps qu&#8217;il faut pour voir migrer les taches d&#8217;un bord \u00e0 l&#8217;autre du Soleil qui tourne sur lui-m\u00eame en un mois environ.<\/p>\n<p><iframe loading=\"lazy\" title=\"Les cycles du soleil | Futura\" width=\"474\" height=\"267\" src=\"https:\/\/www.youtube.com\/embed\/LnWtlgwFtgk?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<h5>Aurores polaires en perspective :<\/h5>\n<p>Il n&#8217;est pas exclu que le passage de ce groupe de taches s&#8217;accompagne d&#8217;\u00e9jection de mati\u00e8re coronale. Une premi\u00e8re \u00e9ruption a provoqu\u00e9 une interruption des communications radio au-dessus de l&#8217;oc\u00e9an Indien le 3 novembre. Mais ce qu&#8217;attendent les astrophotographes, c&#8217;est l&#8217;intensification de belles <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/05\/16\/aurores-boreales-au-dessus-de-la-riviere-des-esclaves\/\" target=\"_blank\" rel=\"noopener noreferrer\">aurores bor\u00e9ales<\/a>. Elles devraient se produire quand le groupe de taches fera face \u00e0 la Terre dans quelques jours. On peut suivre l&#8217;intensit\u00e9 et l&#8217;\u00e9tendue des aurores bor\u00e9ales en temps r\u00e9el sur le site <a href=\"https:\/\/www.spaceweatherlive.com\/en\/auroral-activity\/auroral-oval.html\" target=\"_blank\" rel=\"noopener noreferrer\"><em>Spaceweather<\/em><\/a>.<\/p>\n<figure id=\"attachment_8278\" aria-describedby=\"caption-attachment-8278\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/09\/aurores3.jpg\" rel=\"lightbox[12806]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-8278\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/09\/aurores3-450x300.jpg\" alt=\"\" width=\"450\" height=\"300\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/09\/aurores3-450x300.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/09\/aurores3-768x512.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/09\/aurores3-1024x683.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/09\/aurores3.jpg 1350w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-8278\" class=\"wp-caption-text\">Une aurore bor\u00e9ale se d\u00e9ploie. \u00a9 The Aurora Chasers<\/figcaption><\/figure>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/10\/22\/lenorme-tache-solaire-ar-2192\/\" target=\"_blank\" rel=\"noopener noreferrer\">L&#8217;\u00e9norme tache solaire AR 2192<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/05\/07\/3-mai-1715-leclipse-solaire-dedmond-halley\/\" target=\"_blank\" rel=\"noopener noreferrer\">3 mai 1715 : l&#8217;\u00e9clipse solaire d&#8217;Edmond Halley<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/05\/16\/aurores-boreales-au-dessus-de-la-riviere-des-esclaves\/\" target=\"_blank\" rel=\"noopener noreferrer\">Aurores bor\u00e9ales au-dessus de la rivi\u00e8re des Esclaves<\/a><\/li>\n<\/ul>\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 observateurs du Soleil savourent l&#8217;arriv\u00e9e du premier grand groupe de taches. Le 25e cycle solaire est bel et bien lanc\u00e9. Une histoire de magn\u00e9tisme : Les taches solaires sont des zones sombres (moins chaudes) qui apparaissent r\u00e9guli\u00e8rement \u00e0 la surface de notre \u00e9toile. Elles trahissent une intense activit\u00e9 magn\u00e9tique. Il semble que la plus &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/11\/04\/la-premiere-tache-geante-du-nouveau-cycle-solaire-est-apparue\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">La premi\u00e8re tache g\u00e9ante du nouveau cycle solaire est apparue<\/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":12807,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[2940,1136,465],"class_list":["post-12806","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-ar-2781","tag-aurore-polaire","tag-cycle-solaire"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>La premi\u00e8re tache g\u00e9ante du nouveau cycle solaire est apparue<\/title>\n<meta name=\"description\" content=\"Les observateurs du Soleil savourent l&#039;arriv\u00e9e du premier grand groupe de taches. 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