{"id":12867,"date":"2020-11-13T17:12:39","date_gmt":"2020-11-13T17:12:39","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=12867"},"modified":"2020-11-23T16:48:14","modified_gmt":"2020-11-23T16:48:14","slug":"lactivite-solaire-reprend-les-aurores-polaires-sintensifient","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/11\/13\/lactivite-solaire-reprend-les-aurores-polaires-sintensifient\/","title":{"rendered":"L&#8217;activit\u00e9 solaire reprend, les aurores polaires s&#8217;intensifient"},"content":{"rendered":"<p><strong>De belles taches ont fait leur apparition sur le Soleil depuis quelques jours. Elles s&#8217;accompagnent d&#8217;\u00e9ruptions solaires qui d\u00e9clenchent des aurores.<\/strong><\/p>\n<h5>Le Soleil se r\u00e9veille :<\/h5>\n<p>Le 25e cycle solaire a d\u00e9but\u00e9 en d\u00e9cembre 2019 et le maximum est pr\u00e9vu pour 2025. Jusqu&#8217;\u00e0 pr\u00e9sent l&#8217;activit\u00e9 de notre \u00e9toile \u00e9tait tr\u00e8s modeste. Mais depuis le d\u00e9but du mois les choses se sont acc\u00e9l\u00e9r\u00e9es. Il y a eu un premier grand groupe de taches qui porte le num\u00e9ro AR 2781. On a pu suivre son \u00e9volution au fil des jours 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>).<\/p>\n<figure id=\"attachment_12870\" aria-describedby=\"caption-attachment-12870\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/11\/SDO.jpg\" rel=\"lightbox[12867]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-12870\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/11\/SDO-450x450.jpg\" alt=\"\" width=\"450\" height=\"450\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/11\/SDO-450x450.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/11\/SDO-150x150.jpg 150w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/11\/SDO-768x768.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/11\/SDO.jpg 1000w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-12870\" class=\"wp-caption-text\">Taches solaires le 13 novembre 2020. \u00a9 SDO \/ HMI<\/figcaption><\/figure>\n<p>Alors qu&#8217;il est en train de rejoindre le bord oppos\u00e9 du Soleil, un autre groupe a fait son apparition, AR 2782. La pr\u00e9sence de ces taches trahit une intense activit\u00e9 magn\u00e9tique qui s&#8217;accompagne d&#8217;\u00e9ruptions de mati\u00e8re ionis\u00e9e. <!--more--><\/p>\n<h5>La Terre aux premi\u00e8res loges :<\/h5>\n<p>Lorsque l&#8217;\u00e9nergie stock\u00e9e dans des champs magn\u00e9tiques au-dessus des taches solaires est lib\u00e9r\u00e9e, on assiste \u00e0 une \u00e9ruption solaire. Les particules \u00e9nerg\u00e9tiques qui s&#8217;\u00e9chappent alors peuvent venir frapper notre plan\u00e8te. Les scientifiques classent ces \u00e9ruptions en fonction de leur intensit\u00e9 dans le domaine des rayons X. Ils distinguent trois niveaux de puissance : C, M, X, chacun not\u00e9 de 1 \u00e0 9.<\/p>\n<figure id=\"attachment_12876\" aria-describedby=\"caption-attachment-12876\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/11\/soleil2.jpg\" rel=\"lightbox[12867]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-12876\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/11\/soleil2-450x419.jpg\" alt=\"\" width=\"450\" height=\"419\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/11\/soleil2-450x419.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/11\/soleil2-768x714.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/11\/soleil2.jpg 774w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-12876\" class=\"wp-caption-text\">Une \u00e9ruption solaire enregistr\u00e9e le 11 novembre. \u00a9 SDO \/ AIA<\/figcaption><\/figure>\n<p>La classe C comprend les faibles \u00e9ruptions avec tr\u00e8s peu de cons\u00e9quences sur les activit\u00e9s terrestres. Les \u00e9ruptions class\u00e9es M peuvent provoquer de br\u00e8ves coupures de courant qui affectent les r\u00e9gions polaires sur Terre. Quant aux redoutables \u00e9ruptions de la classe X, elles sont \u00e0 l&#8217;origine de pannes \u00e9lectriques g\u00e9antes.<\/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[12867]\"><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 sous les yeux d&#8217;un astrophotographe. \u00a9 The Aurora Chasers<\/figcaption><\/figure>\n<h5>Fascinantes aurores polaires :<\/h5>\n<p>Les \u00e9ruptions actuelles, modestes, sont de la classe C. Ce qui n&#8217;emp\u00eache pas le plasma solaire qui s&#8217;\u00e9chappe \u00e0 cette occasion de nous atteindre. Les particules \u00e9nerg\u00e9tiques parviennent \u00e0 briser les lignes du champ magn\u00e9tique terrestre et s&#8217;engouffrent au niveau des p\u00f4les. Elles viennent exciter les atomes d&#8217;oxyg\u00e8ne et d&#8217;azote pr\u00e9sents dans la haute atmosph\u00e8re terrestre, ce qui provoque des aurores polaires.<\/p>\n<figure id=\"attachment_11732\" aria-describedby=\"caption-attachment-11732\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/03\/aurore2.jpg\" rel=\"lightbox[12867]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-11732\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/03\/aurore2-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/03\/aurore2-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/03\/aurore2-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/03\/aurore2-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/03\/aurore2.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-11732\" class=\"wp-caption-text\">La Norv\u00e8ge est une destination tr\u00e8s pris\u00e9e par les chasseurs d&#8217;aurores. \u00a9 Andrei Andritcu<\/figcaption><\/figure>\n<h5>\u00c0 savoir :<\/h5>\n<ul>\n<li>Il semble que la plus ancienne observation av\u00e9r\u00e9e de taches solaires soit chinoise et remonte \u00e0 l\u2019an -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>\u00a0fut le premier \u00e0 les observer en 1612 avec une\u00a0<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>. Ces taches sont num\u00e9rot\u00e9es dans l\u2019ordre d\u2019apparition par la <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>.<\/li>\n<li>les aurores polaires ont donn\u00e9 lieu \u00e0 de nombreuses croyances, en particulier les aurores bor\u00e9ales qui ont une grande place dans la culture Inuit. On racontait par exemple aux enfants que les aurores pouvaient les emporter s\u2019ils restaient jouer dehors trop tard et que si l\u2019on sifflait tr\u00e8s fort on pouvait les faire danser !<\/li>\n<\/ul>\n<p><iframe loading=\"lazy\" title=\"Litr\u00edkur Stormur\" src=\"https:\/\/player.vimeo.com\/video\/127443936?dnt=1&amp;app_id=122963\" width=\"474\" height=\"267\" frameborder=\"0\" allow=\"autoplay; fullscreen; picture-in-picture; clipboard-write\"><\/iframe><\/p>\n<p>Suivez l\u2019actualit\u00e9 astronomique 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>De belles taches ont fait leur apparition sur le Soleil depuis quelques jours. Elles s&#8217;accompagnent d&#8217;\u00e9ruptions solaires qui d\u00e9clenchent des aurores. Le Soleil se r\u00e9veille : Le 25e cycle solaire a d\u00e9but\u00e9 en d\u00e9cembre 2019 et le maximum est pr\u00e9vu pour 2025. Jusqu&#8217;\u00e0 pr\u00e9sent l&#8217;activit\u00e9 de notre \u00e9toile \u00e9tait tr\u00e8s modeste. Mais depuis le d\u00e9but &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/11\/13\/lactivite-solaire-reprend-les-aurores-polaires-sintensifient\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">L&#8217;activit\u00e9 solaire reprend, les aurores polaires s&#8217;intensifient<\/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":12868,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[1136,392],"class_list":["post-12867","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-aurore-polaire","tag-eruption-solaire"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>L&#039;activit\u00e9 solaire reprend, les aurores polaires s&#039;intensifient<\/title>\n<meta name=\"description\" content=\"De belles taches ont fait leur apparition sur le Soleil depuis quelques jours. 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