{"id":877,"date":"2005-06-30T09:24:00","date_gmt":"2005-06-30T07:24:00","guid":{"rendered":"https:\/\/kids.esa.int\/esa_s_gravity_explorer\/"},"modified":"2026-10-08T00:33:17","modified_gmt":"2026-10-07T22:33:17","slug":"esa_s_gravity_explorer","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/sv\/esa_s_gravity_explorer\/","title":{"rendered":"ESA:s Gravity Explorer"},"content":{"rendered":"
\n

Enligt en ny studie fr\u00e5n ESA orsakade jordb\u00e4vningen p\u00e5 Sumatra den 26 december 2004 inte bara omfattande f\u00f6rst\u00f6relse i ett stort omr\u00e5de, utan f\u00f6r\u00e4ndrade \u00e4ven gravitationen i det omr\u00e5det n\u00e5got.<\/p>\n<\/div>\n

N\u00e4r Indiska oceanens havsbotten f\u00f6rsk\u00f6ts l\u00e4ngs en 1 000 km l\u00e5ng f\u00f6rkastningslinje under jordb\u00e4vningen bildades en 6 meter h\u00f6g avsats. Denna enorma bergartsf\u00f6rskjutning f\u00f6r\u00e4ndrade omedelbart den lokala tyngdkraften.<\/p>\n

Detta \u00e4r inte ovanligt. Kartor som skapats utifr\u00e5n satellitdata visar att tyngdkraften varierar fr\u00e5n plats till plats. En av orsakerna till detta \u00e4r jordens rotation. N\u00e4r planeten roterar buktar den ut\u00e5t vid ekvatorn. Eftersom jorden \u00e4r 42 km bredare vid ekvatorn \u00e4r tyngdkraften svagare d\u00e4r \u00e4n vid polerna.<\/p>\n

H\u00f6ga berg, djupa havsgravar och olika bergarter inuti jorden p\u00e5verkar ocks\u00e5. Till och med tidvatten, havsstr\u00f6mmar och sm\u00e4ltande ist\u00e4cken g\u00f6r att tyngdkraftens v\u00e4rde varierar.<\/p>\n

\"Artist's
Konstn\u00e4rlig tolkning av GOCE<\/figcaption><\/figure>\n

F\u00f6r n\u00e4rvarande \u00e4r det sv\u00e5rt att m\u00e4ta s\u00e5dana sm\u00e5 f\u00f6r\u00e4ndringar i gravitationen, men detta kommer att \u00e4ndras i och med n\u00e4sta \u00e5rs uppskjutning av ESA:s Gravity Field and Ocean Circulation Explorer (GOCE).<\/p>\n

Den k\u00e4nsliga rymdfarkosten kommer att unders\u00f6ka gravitationen i detalj. N\u00e4r den passerar \u00f6ver omr\u00e5den med starkare respektive svagare gravitationskraft kommer rymdfarkosten att r\u00f6ra sig upp och ner, och dess instrument kommer att registrera f\u00f6r\u00e4ndringarna i gravitationsf\u00e4ltet l\u00e4ngs dess bana.<\/p>\n

Detta kommer att g\u00f6ra det m\u00f6jligt f\u00f6r forskare att m\u00e4ta hur mycket material som f\u00f6rflyttas, antingen pl\u00f6tsligt vid en jordb\u00e4vning eller gradvis, som n\u00e4r en ist\u00e4cke sm\u00e4lter. Uppgifterna kommer till och med att bidra till att avsl\u00f6ja f\u00f6r\u00e4ndringar i havsstr\u00f6mmarna som h\u00e4nger samman med klimatf\u00f6r\u00e4ndringarna.<\/p>","protected":false},"excerpt":{"rendered":"

According to a new ESA study, the Sumatran earthquake of 26 December 2004 not only devastated a huge area, but it slightly altered the gravity of that area. When the […]<\/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\/2005\/04\/ers-2_composite_highlighting_tsunami_damage3\/17891576-2-eng-GB\/ERS-2_composite_highlighting_tsunami_damage.jpg","esa_banner_description":"ERS-2 composite highlighting tsunami damage","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2005\/04\/ERS-2_composite_highlighting_tsunami_damage3","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":[42,10,59],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-877","post","type-post","status-publish","format-standard","hentry","category-earth","category-learn","category-natural-disasters"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts\/877","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/comments?post=877"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts\/877\/revisions"}],"predecessor-version":[{"id":4715,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts\/877\/revisions\/4715"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/media?parent=877"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/categories?post=877"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/tags?post=877"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/panel?post=877"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/language?post=877"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/age?post=877"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/duration?post=877"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/resource_type?post=877"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/audience?post=877"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/wf_post_folders?post=877"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}