{"id":12707,"date":"2023-12-04T15:48:29","date_gmt":"2023-12-04T14:48:29","guid":{"rendered":"https:\/\/reperes-astro.fr\/?p=12707"},"modified":"2025-01-31T18:56:46","modified_gmt":"2025-01-31T17:56:46","slug":"aurores-boreales-toutes-rouges-aux-basses-latitudes","status":"publish","type":"post","link":"https:\/\/reperes-astro.fr\/aurores-boreales-toutes-rouges-aux-basses-latitudes\/","title":{"rendered":"Aurores bor\u00e9ales, derni\u00e8res nouvelles"},"content":{"rendered":"\n<p><strong>MARS EST LE MEILLEUR MOIS DE L\u2019ANN\u00c9E POUR LES AURORES BOR\u00c9ALES :&nbsp;<\/strong>Saviez-vous que mars est le meilleur mois de l\u2019ann\u00e9e pour les aurores bor\u00e9ales ? C\u2019est vrai.&nbsp;<a href=\"https:\/\/spaceweather.com\/repeat_images\/equinoxes.png\">Une \u00e9tude de 75 ans<\/a>&nbsp;montre que mars a plus de jours g\u00e9omagn\u00e9tiquement actifs que tout autre mois de l\u2019ann\u00e9e. (Le mois d\u2019octobre suit de pr\u00e8s.) Cela est d\u00fb \u00e0&nbsp;<a href=\"https:\/\/agupubs.onlinelibrary.wiley.com\/doi\/10.1029\/JA078i001p00092\">l\u2019effet Russell-McPherron<\/a>. En bref, des fissures ont tendance \u00e0 se former dans la magn\u00e9tosph\u00e8re terrestre pendant les semaines autour des \u00e9quinoxes, ce qui permet au vent solaire de d\u00e9clencher des aurores bor\u00e9ales.&nbsp;<\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Aurores bor\u00e9ales toutes rouges aux basses latitudes<\/strong><\/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\/2023\/12\/sarx4_strip.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"520\" height=\"475\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2023\/12\/sarx4_strip.jpg\" alt=\"\" class=\"wp-image-12708\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2023\/12\/sarx4_strip.jpg 520w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2023\/12\/sarx4_strip-300x274.jpg 300w\" sizes=\"auto, (max-width: 520px) 100vw, 520px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p>Les aurores apparaissent lorsque des particules charg\u00e9es pleuvent de l\u2019espace, frappant l\u2019atmosph\u00e8re et la faisant briller. <\/p>\n\n\n\n<p>Les arcs SAR se forment diff\u00e9remment. Ils sont un signe de fuite d\u2019\u00e9nergie thermique dans la haute atmosph\u00e8re \u00e0 partir du syst\u00e8me de courant annulaire de la Terre \u2013 un circuit en forme de beignet transportant des millions d\u2019amp\u00e8res autour de notre plan\u00e8te.<\/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\/2023\/12\/ringcurrent_strip.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"520\" height=\"189\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2023\/12\/ringcurrent_strip.jpg\" alt=\"\" class=\"wp-image-12709\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2023\/12\/ringcurrent_strip.jpg 520w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2023\/12\/ringcurrent_strip-300x109.jpg 300w\" sizes=\"auto, (max-width: 520px) 100vw, 520px\" \/><\/a><figcaption class=\"wp-element-caption\">Un concept d\u2019artiste du courant annulaire de la Terre, silencieux (\u00e0 gauche) et actif (\u00e0 droite)<\/figcaption><\/figure>\n<\/div>\n\n\n<p>Les arcs SAR ont \u00e9t\u00e9 d\u00e9couverts en 1956 au d\u00e9but de l\u2019\u00e8re spatiale. Les chercheurs ne savaient pas ce qu\u2019ils \u00e9taient et leur ont involontairement donn\u00e9 un nom trompeur : \u00ab arcs rouges auroraux stables \u00bb ou arcs SAR. En fait, les arcs SAR ne sont ni stables ni des aurores bor\u00e9ales.<\/p>\n\n\n\n<p><\/p>\n<div class=\"pvc_clear\"><\/div><p id=\"pvc_stats_12707\" class=\"pvc_stats all  \" data-element-id=\"12707\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" data-prefix=\"far\" data-icon=\"chart-bar\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\" class=\"svg-inline--fa fa-chart-bar fa-w-16 fa-2x\"><path fill=\"currentColor\" d=\"M396.8 352h22.4c6.4 0 12.8-6.4 12.8-12.8V108.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v230.4c0 6.4 6.4 12.8 12.8 12.8zm-192 0h22.4c6.4 0 12.8-6.4 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><div class=\"pvc_clear\"><\/div>","protected":false},"excerpt":{"rendered":"<p>MARS EST LE MEILLEUR MOIS DE L\u2019ANN\u00c9E POUR LES AURORES BOR\u00c9ALES :&nbsp;Saviez-vous que mars est le meilleur mois de l\u2019ann\u00e9e pour&#46;&#46;&#46;<\/p>\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_12707\" class=\"pvc_stats all  \" data-element-id=\"12707\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" data-prefix=\"far\" data-icon=\"chart-bar\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\" class=\"svg-inline--fa fa-chart-bar fa-w-16 fa-2x\"><path fill=\"currentColor\" d=\"M396.8 352h22.4c6.4 0 12.8-6.4 12.8-12.8V108.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v230.4c0 6.4 6.4 12.8 12.8 12.8zm-192 0h22.4c6.4 0 12.8-6.4 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":12715,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[57],"tags":[],"class_list":["post-12707","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aurores-et-autres-evenements"],"a3_pvc":{"activated":true,"total_views":34,"today_views":0},"yoast_head":"<title>Aurores bor\u00e9ales, derni\u00e8res nouvelles - 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