{"id":75706,"date":"2024-05-15T11:56:18","date_gmt":"2024-05-15T10:56:18","guid":{"rendered":"https:\/\/www.parcastronomicprades.cat\/tv3-la-tempesta-geomagnetica-mes-forta-en-20-anys-provoca-aurores-a-catalunya\/"},"modified":"2024-05-15T11:56:18","modified_gmt":"2024-05-15T10:56:18","slug":"tv3-la-tempesta-geomagnetica-mes-forta-en-20-anys-provoca-aurores-a-catalunya","status":"publish","type":"post","link":"https:\/\/www.parcastronomicprades.cat\/es\/tv3-la-tempesta-geomagnetica-mes-forta-en-20-anys-provoca-aurores-a-catalunya\/","title":{"rendered":"TV3: La tempesta geomagn\u00e8tica m\u00e9s forta en 20 anys provoca aurores a Catalunya"},"content":{"rendered":"<div class=\"F-mediaPrincipal\">\n<div class=\"embed-container gapHalfAfter\"><iframe title=\"video 6281786\" src=\"https:\/\/www.ccma.cat\/3cat\/video\/6281786\/embed\/\" width=\"500px\" height=\"281px\" frameborder=\"0\" scrolling=\"no\" allowfullscreen=\"allowfullscreen\" data-mce-fragment=\"1\"><\/iframe><\/div>\n<\/div>\n<header class=\"R-itemNotiInfo\">\n<h1 class=\"titol\">La tempesta geomagn\u00e8tica m\u00e9s forta en 20 anys provoca aurores a Catalunya<\/h1>\n<div class=\"wrapper-autor-data-compartir\">\n<div class=\"R-autorData noFoto C-dosDates \">\n<div class=\"F-autorData C-dosDates\"><small class=\"autor\">Alberto Alc\u00e1ntara<\/small><time class=\"data\" datetime=\"2024-05-11 08:39\">11\/05\/2024 &#8211; 08.39<\/time><span class=\"data\">Actualitzat<\/span><time class=\"data\" datetime=\"2024-05-11 14:20\">11\/05\/2024 &#8211; 14.20<\/time><\/div>\n<\/div>\n<div class=\"R-rightShare C-dosDates\">\n<div class=\"F-addThisTop\">\n<div class=\"wrapper_M-compartir C-dreta C-neutre C-itemNoti_dosDates\">\n<div id=\"M-compartirTop\" class=\"M-compartir noGapAfter\" role=\"region\" aria-label=\"Comparteix\" data-mode=\"pu-basic\" data-titol=\"\" data-url=\"\">\n<div class=\"ico-facebook2\"><span class=\"sr-only\">compartir a Facebook<\/span><\/div>\n<div class=\"ico-twitter\"><span class=\"sr-only\">compartir a X<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"F-permestard C-separador\">\n<div class=\"botoitem-view view-attached\" data-tipus_contingut=\"NOT_NOTICIA\" data-idint=\"3292150\" data-nom=\"Meteorologia\" data-nom_programa=\"\" data-is_ru=\"\" data-caducat=\"0\">\n<div class=\"M-htmltwig-pmtard\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/header>\n<div class=\"R-itemNotiCos\">\n<p>La tempesta geomagn\u00e8tica <strong>m\u00e9s forta en gaireb\u00e9 20 anys <\/strong>s&#8217;ha fet visible a Catalunya i, fins i tot, a latituds m\u00e9s baixes. La nit de divendres a dissabte ens ha regalat un espectacle dif\u00edcil d&#8217;oblidar, en forma d&#8217;<strong>aurores que han tenyit el cel de tons vermellosos. <\/strong> <\/p>\n<figure class=\"imatge\"><img decoding=\"async\" class=\"CKEditorImageContainer_670x378\" src=\"https:\/\/img.ccma.cat\/multimedia\/jpg\/1\/1\/1715403334911_670.jpg\" alt=\"\"><figcaption>La Gola del Ter (Francesc Jordan)<\/figcaption><\/figure>\n<h2><strong>Nit d&#8217;aurores a Catalunya<\/strong><\/h2>\n<p>El fenomen ha provocat una allau d&#8217;imatges, totes compartides amb un missatge com\u00fa: la sensaci\u00f3 d&#8217;estar <strong>vivint un esdeveniment molt especial i emotiu. <\/strong>Podeu fer un cop d&#8217;ull a la secci\u00f3 de <a href=\"https:\/\/www.ccma.cat\/el-temps\/fotos\/\">fotos dels espectadors del portal del temps<\/a>. O tamb\u00e9 a la <a href=\"https:\/\/www.ccma.cat\/el-temps\/nit-daurores-a-catalunya\/foto-galeria\/84895\/\">galeria de fotos espec\u00edfica<\/a> per a aquest esdeveniment. Aqu\u00ed recuperem algus dels missatges difosos per xarxes socials.<\/p>\n<h2><strong>Aurora vermella o SAR?<\/strong><\/h2>\n<p>Les aurores vermelles es produeixen quan les part\u00edcules solars reaccionen amb l&#8217;oxigen a altituds m\u00e9s altes, generalment entre 300 i 400 quil\u00f2metres. L&#8217;oxigen s&#8217;excita a una freq\u00fc\u00e8ncia o longitud d&#8217;ona m\u00e9s alta i menys visible al ulls. A aquesta al\u00e7ada, l&#8217;ox\u00edgen est\u00e0 menys concentrat, i per aix\u00f2 tamb\u00e9 es necessita que la tempesta sigui molt intensa perqu\u00e8 es puguin veure a ull nu.<\/p>\n<p>Tamb\u00e9 hi ha la possibilitat que el color vermell sigui producte dels anomenats <strong>SAR (Stable Auroral Red arc) o aurores estables vermelles<\/strong>. Els SAR es van descobrir l&#8217;any 1956. A difer\u00e8ncia de les aurores t\u00edpiques, les aurores estables vermelles fan visible la transfer\u00e8ncia d&#8217;energia t\u00e8rmica des del sistema d&#8217;anells de corrents de la Terra fins a l&#8217;atmosfera superior.<\/p>\n<h2><strong>La tempesta m\u00e9s forta des del 2005<\/strong><\/h2>\n<p>La tempesta d&#8217;aquest cap de setmana deriva de la taca solar gegant <strong>AR3664<\/strong>, que feia preveure una grau d&#8217;activitat geomagn\u00e8tica molt elevat. De fet, el que ha provocat l&#8217;espectacle d&#8217;aquesta nit ha estat<strong> la primera de les sis ejeccions de massa coronal (<\/strong>CME) que ha produ\u00eft el Sol, \u00e9s a dir, la primera d&#8217;una s\u00e8rie d&#8217;explosions que han llan\u00e7at material (plasma) de la corona solar a l&#8217;espai.<\/p>\n<p>&nbsp;<\/p>\n<\/div>\n<p><a href=\"https:\/\/www.ccma.cat\/el-temps\/la-tempesta-geomagnetica-mes-forta-en-20-anys-provoca-aurores-a-catalunya\/noticia\/3292150\/\">VER LA NOTICIA<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>La tempesta geomagn\u00e8tica m\u00e9s forta en 20 anys provoca aurores a Catalunya Alberto Alc\u00e1ntara11\/05\/2024 &#8211; 08.39Actualitzat11\/05\/2024 &#8211; 14.20 compartir a [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":75704,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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