{"id":26611,"date":"2022-02-10T13:38:43","date_gmt":"2022-02-10T12:38:43","guid":{"rendered":"https:\/\/ellipse.prbb.org\/?p=26611"},"modified":"2022-02-10T13:38:45","modified_gmt":"2022-02-10T12:38:45","slug":"els-colors-de-la-sortida-del-sol","status":"publish","type":"post","link":"https:\/\/ellipse.prbb.org\/ca\/els-colors-de-la-sortida-del-sol\/","title":{"rendered":"Els colors de la sortida del sol"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">El&nbsp;<a rel=\"noreferrer noopener\" href=\"https:\/\/www.prbb.org\/?l=ca\" target=\"_blank\">Parc de Recerca Biom\u00e8dica de Barcelona (PRBB)<\/a>&nbsp;ens ofereix cada dia <a rel=\"noreferrer noopener\" href=\"https:\/\/ellipse.prbb.org\/ca\/mes-de-4-000-metres-quadrats-de-terrasses-amb-vistes-al-mar\/\" target=\"_blank\">unes vistes al ma<\/a><a href=\"https:\/\/ellipse.prbb.org\/ca\/mes-de-4-000-metres-quadrats-de-terrasses-amb-vistes-al-mar\/\" target=\"_blank\" rel=\"noreferrer noopener\">r<\/a><a rel=\"noreferrer noopener\" href=\"https:\/\/ellipse.prbb.org\/ca\/mes-de-4-000-metres-quadrats-de-terrasses-amb-vistes-al-mar\/\" target=\"_blank\"> privilegiades<\/a>. Avui mirem des de l&#8217;\u00f2ptica el per qu\u00e8 d&#8217;aquests preciosos <strong>colors de la sortida del sol<\/strong> a trav\u00e9s de la <strong>fotografia <\/strong>enviada per la <strong>Cristina Pujades<\/strong> (<strong><a href=\"https:\/\/www.upf.edu\/inici\">UPF<\/a><\/strong>).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A la fotografia, s&#8217;hi pot veure com el cel mostra una paleta de colors del rosat o vermell als taronges i grocs intensos.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Si mai us heu preguntat <a href=\"https:\/\/www.metoffice.gov.uk\/weather\/learn-about\/weather\/optical-effects\/why-is-the-sunset-red\" target=\"_blank\" rel=\"noreferrer noopener\">els motius d&#8217;aquests colors<\/a>, es tracta d&#8217;una q\u00fcesti\u00f3 de <strong>dispersi\u00f3 de la llum solar<\/strong>. L&#8217;atmosfera fa de capa entre el sol i la terra. Quan el sol la travessa en l\u00ednia recta (com quan tenim el sol en zenit, \u00e9s a dir just a sobre del nostre cap), es travessa poca <strong>atmosfera<\/strong>, i la llum \u00e9s capa\u00e7 d&#8217;arribar en l\u00ednia recta en la mateixa direcci\u00f3 que ha entrat. Per\u00f2 quan queda davant de la l\u00ednia de <strong>l&#8217;horitz\u00f3 <\/strong>(sortides i postes de sol), la llum travessa en <strong>direcci\u00f3 obliqua<\/strong>. Aleshores travessa molta part d&#8217;atmosfera dispersant les longituds d&#8217;ona curtes, i nom\u00e9s permetent que les longituds d&#8217;ona llarga (vermells, i la resta de colors c\u00e0lids) arribin el l\u00b4\u00ednia recta des d&#8217;on han estat emesos.<\/p>\n\n\n\n<div style=\"height:29px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><a href=\"https:\/\/www.metoffice.gov.uk\/weather\/learn-about\/weather\/optical-effects\/why-is-the-sunset-red\"><img decoding=\"async\" src=\"https:\/\/www.metoffice.gov.uk\/binaries\/content\/gallery\/red_sunset_1920x980px.jpg\/red_sunset_1920x980px.jpg\/metofficegovuk%3Axsmall\" alt=\"\"\/><\/a><figcaption>Infografia explicativa de <a href=\"https:\/\/www.metoffice.gov.uk\/weather\/learn-about\/weather\/optical-effects\/why-is-the-sunset-red\" target=\"_blank\" rel=\"noreferrer noopener\">Metoffice<\/a><\/figcaption><\/figure><\/div>\n\n\n\n<div style=\"height:29px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Aix\u00ed, durant uns minuts cada dia, tenim la sort de gaudir d&#8217;un incre\u00efble <strong><a rel=\"noreferrer noopener\" href=\"https:\/\/ellipse.prbb.org\/ca\/els-filtres-per-les-mascaretes\/\" target=\"_blank\">espectacle de llum des del PRBB<\/a><\/strong>, especialment a l&#8217;hivern. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Donem les gr\u00e0cies a la <strong>Cristina Pujades<\/strong> per compartir aquesta preciosa fotografia de la sortida del sol des del PRBB.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span class=\"has-inline-color has-cyan-bluish-gray-color\">Vols veure la teva foto aqu\u00ed? Envia\u2019ns imatges relacionades amb la ci\u00e8ncia o la vida al PRBB a&nbsp;<a rel=\"noreferrer noopener\" href=\"mailto:ellipse@prbb.org\" target=\"_blank\">ellipse@prbb.org.<\/a><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>El&nbsp;Parc de Recerca Biom\u00e8dica de Barcelona (PRBB)&nbsp;ens ofereix cada dia unes vistes al mar privilegiades. Avui mirem des de l&#8217;\u00f2ptica el per qu\u00e8 d&#8217;aquests preciosos colors de la sortida del sol a trav\u00e9s de la fotografia enviada per la Cristina Pujades (UPF). A la fotografia, s&#8217;hi pot veure com el cel mostra una paleta de [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":26612,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[28],"tags":[349,358],"new-type":[40],"class_list":["post-26611","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-comunitat","tag-edifici-del-prbb","tag-upf-ca","new-type-foto-de-la-setmana"],"acf":[],"_links":{"self":[{"href":"https:\/\/ellipse.prbb.org\/ca\/wp-json\/wp\/v2\/posts\/26611","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ellipse.prbb.org\/ca\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ellipse.prbb.org\/ca\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ellipse.prbb.org\/ca\/wp-json\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"https:\/\/ellipse.prbb.org\/ca\/wp-json\/wp\/v2\/comments?post=26611"}],"version-history":[{"count":19,"href":"https:\/\/ellipse.prbb.org\/ca\/wp-json\/wp\/v2\/posts\/26611\/revisions"}],"predecessor-version":[{"id":27944,"href":"https:\/\/ellipse.prbb.org\/ca\/wp-json\/wp\/v2\/posts\/26611\/revisions\/27944"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ellipse.prbb.org\/ca\/wp-json\/wp\/v2\/media\/26612"}],"wp:attachment":[{"href":"https:\/\/ellipse.prbb.org\/ca\/wp-json\/wp\/v2\/media?parent=26611"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ellipse.prbb.org\/ca\/wp-json\/wp\/v2\/categories?post=26611"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ellipse.prbb.org\/ca\/wp-json\/wp\/v2\/tags?post=26611"},{"taxonomy":"new-type","embeddable":true,"href":"https:\/\/ellipse.prbb.org\/ca\/wp-json\/wp\/v2\/new-type?post=26611"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}