{"id":395,"date":"2018-04-16T12:39:00","date_gmt":"2018-04-16T10:39:00","guid":{"rendered":"https:\/\/kids.esa.int\/esa_satellites_map_mysterious_ocean_magnetism\/"},"modified":"2026-10-08T00:27:41","modified_gmt":"2026-10-07T22:27:41","slug":"esa_satellites_map_mysterious_ocean_magnetism","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/esa_satellites_map_mysterious_ocean_magnetism\/","title":{"rendered":"ESA:n satelliitit kartoittavat merien salaper\u00e4ist\u00e4 magneettisuutta"},"content":{"rendered":"<div class=\"lede\">\n<p>Maapallo on kiehtova maailma, ja siit\u00e4 on viel\u00e4 paljon asioita, joita emme t\u00e4ysin ymm\u00e4rr\u00e4. Maapallon magneettikentt\u00e4 kiehtoo tutkijoita, ja ESA:n Swarm-niminen tutkimusprojekti auttaa selvitt\u00e4m\u00e4\u00e4n siit\u00e4 lis\u00e4\u00e4. Swarm-projektiin kuuluu kolme satelliittia, ja niiden tuoreimmat tulokset on juuri julkistettu!<\/p>\n<\/div>\n<figure class=\"wp-block-image size-large\" data-width=\"5209\" data-credit=\"ESA\/ATG medialab\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2018\/04\/Earth_s_protective_shield\" data-licence=\"ESA Standard Licence\" data-licence-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Terms_and_conditions_of_use_of_images_and_videos_available_on_the_esa_website\"><img decoding=\"async\" loading=\"lazy\" style=\"max-width:100%;height:auto\" src=\"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2018\/04\/earth_s_protective_shield\/17902049-2-eng-GB\/Earth_s_protective_shield.jpg\" alt=\"Earth&#x27;s protective shield\"><figcaption>Maan suojakilpi<\/figcaption><\/figure>\n<p>Maan magneettikentt\u00e4 syntyy p\u00e4\u00e4asiassa uskomattoman kuumasta nestem\u00e4isest\u00e4 raudasta, joka liikkuu planeettamme ytimen ymp\u00e4rill\u00e4. My\u00f6s maankuoren magnetisoituneilla kivill\u00e4 on pieni vaikutus. Tiesitk\u00f6, ett\u00e4 my\u00f6s merivesi on magnetismin l\u00e4hde? Kun suolaista merivett\u00e4 virtaa maapallon magneettikent\u00e4n l\u00e4pi, syntyy s\u00e4hk\u00f6virta, joka puolestaan luo magneettisen voiman. Se on hyvin pieni ja uskomattoman vaikea mitata, mutta Swarm-satelliitit ovat juuri t\u00e4m\u00e4n onnistuneet tekem\u00e4\u00e4n.<\/p>\n<p>Magneettikenttien kartoittaminen merenpinnasta merenpohjaan on antanut tutkijoille mahdollisuuden selvitt\u00e4\u00e4, miten vesi virtaa kaikilla syvyyksill\u00e4 \u2013 t\u00e4m\u00e4 on t\u00e4ysin uutta tietoa. Meret imev\u00e4t l\u00e4mp\u00f6\u00e4 ilmasta, joten l\u00e4mm\u00f6n levi\u00e4misen seuraaminen meriss\u00e4 on t\u00e4rke\u00e4 osa maapallon ilmaston ymm\u00e4rt\u00e4mist\u00e4. Swarm-mission uusimmat tulokset auttavat meit\u00e4 jopa oppimaan lis\u00e4\u00e4 maankuoren ja sen v\u00e4litt\u00f6m\u00e4ss\u00e4 l\u00e4heisyydess\u00e4 sijaitsevan alueen \u2013 litosf\u00e4\u00e4rin \u2013 s\u00e4hk\u00f6isist\u00e4 ominaisuuksista. Itse asiassa Swarm on laatinut uuden kartan maankuoren tuottamasta magneettikent\u00e4st\u00e4!<\/p>\n<\/p>\n<p>Swarm-luotain on kartoittanut, miten maapallon magneettikentt\u00e4 muuttuu 24 tunnin aikana. Punainen v\u00e4ri osoittaa voimakkaimmat magneettiset signaalit. Tekij\u00e4noikeus: \u00a9 Planetary Visions (l\u00e4hde: ESA\/Planetary Visions).<\/p>\n<p>Kaikki t\u00e4m\u00e4 on t\u00e4rke\u00e4\u00e4, koska Maan magneettikentt\u00e4 suojaa meit\u00e4 avaruuden haitalliselta s\u00e4teilylt\u00e4, on osa ilmastoamme ja voi paljastaa salaisuuksia planeettamme sis\u00e4osista. Joten mit\u00e4 enemm\u00e4n saamme selville magneettikent\u00e4st\u00e4mme, sit\u00e4 enemm\u00e4n opimme kotoplaneettamme salaisuuksista.<\/p>\n<p><b>Mielenkiintoinen fakta:<\/b> Kolme Swarm-satelliittia ovat Alpha, Bravo ja Charlie.<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"1680\" data-credit=\"Join ETH Zurich on a journey into space: Ulrike Kastrup, Kerstin Fankhauser, Gillian Gr\u00fcn, Jessica Kind, Bettina Gutbrodt, Andrea D\u00e4hler; focusTerra, ETH Z\u00fcrich; Illustrations by Astrid Nippoldt of Studio Nippoldt, 2018\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2018\/04\/Hunting_for_that_elusive_magnetic_signal\" data-licence=\"ESA Standard Licence\" data-licence-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Terms_and_conditions_of_use_of_images_and_videos_available_on_the_esa_website\"><img decoding=\"async\" loading=\"lazy\" style=\"max-width:100%;height:auto\" src=\"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2018\/04\/hunting_for_that_elusive_magnetic_signal\/17882104-2-eng-GB\/Hunting_for_that_elusive_magnetic_signal.jpg\" alt=\"Hunting for that elusive magnetic signal\"><figcaption>Tuon vaikeasti havaittavan magneettisen signaalin etsiminen<\/figcaption><\/figure>","protected":false},"excerpt":{"rendered":"<p>Planet Earth is a fascinating world, and there is still a lot about it that we do not fully understand. Earth\u2019s magnetic field intrigues scientists, and an ESA mission called [&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\/2018\/04\/front_of_swarm_satellite\/17879477-2-eng-GB\/Front_of_Swarm_satellite.jpg","esa_banner_description":"Front of Swarm satellite","esa_banner_credit":"ESA\/ATG medialab","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2018\/04\/Front_of_Swarm_satellite","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":[26],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-395","post","type-post","status-publish","format-standard","hentry","category-news"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/395","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=395"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/395\/revisions"}],"predecessor-version":[{"id":4441,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/395\/revisions\/4441"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=395"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=395"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=395"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=395"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=395"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=395"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=395"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=395"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=395"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=395"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}