{"id":492,"date":"2016-05-30T07:29:00","date_gmt":"2016-05-30T05:29:00","guid":{"rendered":"https:\/\/kids.esa.int\/the_aurora\/"},"modified":"2026-10-08T00:28:49","modified_gmt":"2026-10-07T22:28:49","slug":"the_aurora","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/the_aurora\/","title":{"rendered":"Revontulet"},"content":{"rendered":"<div class=\"lede\">\n<p>Oletko koskaan n\u00e4hnyt revontulia? Se on kaunis, aaltoileva valoverho y\u00f6taivaalla, ja se on vaikuttava ja unohtumaton n\u00e4ky niille, jotka ovat olleet onnekkaita n\u00e4kem\u00e4\u00e4n sen. Mutta mist\u00e4 revontulet johtuvat?<\/p>\n<\/div>\n<p>Kaikki alkaa l\u00e4himm\u00e4st\u00e4 t\u00e4hdest\u00e4mme, Auringosta. Aurinko on uskomattoman energinen ja tuottaa jatkuvasti niin sanottua aurinkotuulta \u2013 pienten hiukkasten virtaa. N\u00e4m\u00e4 hiukkaset lent\u00e4v\u00e4t avaruuteen ja poikkeavat suunnastaan Maata ymp\u00e4r\u00f6iv\u00e4n magneettikent\u00e4n vaikutuksesta.<\/p>\n<p>Yleens\u00e4 tarina p\u00e4\u00e4ttyy t\u00e4h\u00e4n\u2026 mutta toisinaan Auringossa tapahtuu valtavia purkauksia, joita kutsutaan aurinkopurkauksiksi ja jotka voimistavat aurinkotuulta entisest\u00e4\u00e4n. Kun n\u00e4in tapahtuu, hiukkasilla on niin paljon energiaa, etteiv\u00e4t ne vain lent\u00e4isi Maan magneettikentt\u00e4\u00e4n \u2013 ne t\u00f6rm\u00e4\u00e4v\u00e4t siihen t\u00e4ysill\u00e4!<\/p>\n<p>Auringon tuulen hiukkaset seuraavat sitten Maan magneettikentt\u00e4\u00e4 planeettamme pohjois- ja etel\u00e4napoihin. Lopulta hiukkaset t\u00f6rm\u00e4\u00e4v\u00e4t ilmakeh\u00e4ss\u00e4mme oleviin kaasuihin. Kaikki t\u00e4m\u00e4 energia vapautuu sitten valona! Auringon tuulen hiukkaset t\u00f6rm\u00e4\u00e4v\u00e4t hapen kanssa ja tuottavat upean vihre\u00e4n v\u00e4rin. Typpi luo kauniita sinisen ja violetin s\u00e4vyj\u00e4. Juuri t\u00e4m\u00e4 aiheuttaa revontulet.<\/p>\n<p>Niin kaunis kuin revontulet ovatkin, aurinkotuulen muut sivuvaikutukset voivat aiheuttaa ongelmia. Korkeaenergiset hiukkaset voivat vahingoittaa maapallon kiertoradalla olevia satelliitteja ja vaarantaa astronauttien turvallisuuden. Ne voivat jopa aiheuttaa s\u00e4hk\u00f6katkoja maapallon pinnalla. Revontulet eiv\u00e4t ole ainutlaatuinen ilmi\u00f6 maapallolle. My\u00f6s joillakin muilla aurinkokuntamme planeetoilla, kuten Saturnuksella ja Jupiterilla, on magneettikentti\u00e4. Aurinkotuulen hiukkaset voivat t\u00f6rm\u00e4t\u00e4 niihin aivan kuten Maassakin! Haluaisitko lent\u00e4\u00e4 toiselle planeetalle katsomaan sen revontulia?<\/p>\n<p><b>Mielenkiintoinen fakta:<\/b> Revontulet on nimetty roomalaisen aamunkoiton jumalattaren mukaan.<\/p>\n<nav class=\"related\" aria-label=\"Aiheeseen liittyv\u00e4t\">\n<h2 class=\"related__heading\">Aiheeseen liittyv\u00e4t<\/h2>\n<div class=\"grid related__grid\">\n<div class=\"grid-item\">\n<article class=\"card focuson agency\"><a class=\"card__link\" href=\"\/fi\/polarlys\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">Tanska<\/h3>\n<\/header>\n<p><\/a><\/article>\n<\/div>\n<div class=\"grid-item\">\n<article class=\"card focuson agency\"><a class=\"card__link\" href=\"\/fi\/aurora_of_het_poollicht\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">hollanti<\/h3>\n<\/header>\n<p><\/a><\/article>\n<\/div>\n<div class=\"grid-item\">\n<article class=\"card focuson agency\"><a class=\"card__link\" href=\"\/fi\/les_aurores\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">ranska<\/h3>\n<\/header>\n<p><\/a><\/article>\n<\/div>\n<div class=\"grid-item\">\n<article class=\"card focuson agency\"><a class=\"card__link\" href=\"\/fi\/das_nordlicht\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">saksa<\/h3>\n<\/header>\n<p><\/a><\/article>\n<\/div>\n<div class=\"grid-item\">\n<article class=\"card focuson agency\"><a class=\"card__link\" href=\"\/fi\/l_aurora\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">italia<\/h3>\n<\/header>\n<p><\/a><\/article>\n<\/div>\n<div class=\"grid-item\">\n<article class=\"card focuson agency\"><a class=\"card__link\" href=\"\/fi\/polarlyset\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">norja<\/h3>\n<\/header>\n<p><\/a><\/article>\n<\/div>\n<div class=\"grid-item\">\n<article class=\"card focuson agency\"><a class=\"card__link\" href=\"\/fi\/zorza_polarna\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">puola<\/h3>\n<\/header>\n<p><\/a><\/article>\n<\/div>\n<div class=\"grid-item\">\n<article class=\"card focuson agency\"><a class=\"card__link\" href=\"\/fi\/la_aurora\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">espanja<\/h3>\n<\/header>\n<p><\/a><\/article>\n<\/div>\n<div class=\"grid-item\">\n<article class=\"card focuson agency\"><a class=\"card__link\" href=\"\/fi\/auroran_norrskenet\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">ruotsi<\/h3>\n<\/header>\n<p><\/a><\/article>\n<\/div>\n<\/div>\n<\/nav>","protected":false},"excerpt":{"rendered":"<p>Have you ever seen the aurora? A beautiful curtain of rippling light in the night sky, it is an awe-inspiring and unforgettable sight for those lucky enough to have witnessed [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"esa_banner_image":"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2012\/09\/aurora_borealis2\/17887210-2-eng-GB\/Aurora_borealis.jpg","esa_banner_description":"Aurora borealis","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2012\/09\/Aurora_borealis2","esa_external_url":"","esa_external_new_window":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":true},"categories":[10,11,35],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-492","post","type-post","status-publish","format-standard","hentry","category-learn","category-our-universe","category-the-sun"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/492","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/comments?post=492"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/492\/revisions"}],"predecessor-version":[{"id":1635,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/492\/revisions\/1635"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=492"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=492"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=492"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=492"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=492"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=492"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=492"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=492"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=492"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=492"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}