{"id":896,"date":"2008-03-17T10:42:00","date_gmt":"2008-03-17T09:42:00","guid":{"rendered":"https:\/\/kids.esa.int\/a_swirling_atmospheric_sink_on_venus\/"},"modified":"2026-10-08T00:33:30","modified_gmt":"2026-10-07T22:33:30","slug":"a_swirling_atmospheric_sink_on_venus","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/nb\/a_swirling_atmospheric_sink_on_venus\/","title":{"rendered":"En virvlende atmosf\u00e6risk nedsenkning p\u00e5 Venus"},"content":{"rendered":"
\n

Tenk deg en planet med to avl\u00f8p, ett i nord og ett i s\u00f8r. I hvert avl\u00f8p finnes det en virvel av atmosf\u00e6riske gasser som hvirvler rundt i h\u00f8y hastighet mens de styrter ned mot overflaten. Dette ser ut til \u00e5 v\u00e6re det som skjer p\u00e5 Jordens s\u00f8sterplanet, Venus, if\u00f8lge ESAs romfart\u00f8y Venus Express.<\/p>\n<\/div>\n

Europas robotutforsker har v\u00e6rt i bane rundt den andre planeten fra Solen siden 11. april 2006. Noen av de aller f\u00f8rste observasjonene viste et m\u00f8rkt, orkanlignende fenomen (kjent som en virvel) over s\u00f8rpolen. En lignende skystruktur var allerede blitt oppdaget over nordpolen.<\/p>\n

\"The
Orkanens \u00f8ye<\/figcaption><\/figure>\n

Siden den gang har Venus Express kontinuerlig observert Venus\u201c s\u00f8rpol, og sentrum av \u201dvirvelen\u00bb har vist seg \u00e5 v\u00e6re overraskende foranderlig. Den 26. februar 2007 hadde den form som et timeglass. 24 timer tidligere var den nesten sirkul\u00e6r. Andre ganger ser den oval (eggformet) ut. Det er tydelig at dette fenomenet skifter form ganske raskt.<\/p>\n

Hva er \u00e5rsaken til den 2000 km brede virvelen? Venus Express har vist at sentrum av virvelen er varmere enn omgivelsene. I likhet med \u00f8yet i en orkan markerer dette varmere omr\u00e5det stedet der gassene i atmosf\u00e6ren beveger seg nedover, noe som skaper et lavtrykk ved skytoppene.<\/p>\n

\u201cDen enorme virvelen ligner p\u00e5 det man kan se i badekaret n\u00e5r man har trukket ut proppen,\u201d sier Giuseppe Piccioni, forsker ved Venus Express.<\/p>\n

Forskere mener at atmosf\u00e6ren, som best\u00e5r av karbondioksid, varmes opp av solen ved ekvator. Gassen stiger opp og beveger seg deretter mot polene. I polaromr\u00e5dene synker den ned og danner det atmosf\u00e6riske \u201cavl\u00f8pet\u201d.<\/p>","protected":false},"excerpt":{"rendered":"

Imagine a planet with two drains, one in the north and the other in the south. Each drain features a whirlpool of atmospheric gases which are swirling around at high […]<\/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\/2008\/03\/venus_s_polar_vortex2\/18246846-2-eng-GB\/Venus_s_polar_vortex.jpg","esa_banner_description":"Venus's polar vortex","esa_banner_credit":"ESA\/VIRTIS\/INAF-IASF\/Obs. de Paris-LESIA\/Univ. of Oxford","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2008\/03\/Venus_s_polar_vortex2","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":[10,11,12],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-896","post","type-post","status-publish","format-standard","hentry","category-learn","category-our-universe","category-planets-and-moons"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts\/896","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/comments?post=896"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts\/896\/revisions"}],"predecessor-version":[{"id":4726,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts\/896\/revisions\/4726"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/media?parent=896"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/categories?post=896"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/tags?post=896"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/panel?post=896"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/language?post=896"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/age?post=896"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/duration?post=896"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/resource_type?post=896"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/audience?post=896"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/wf_post_folders?post=896"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}