{"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\/sv\/a_swirling_atmospheric_sink_on_venus\/","title":{"rendered":"En virvlande atmosf\u00e4risk s\u00e4nka p\u00e5 Venus"},"content":{"rendered":"
\n

F\u00f6rest\u00e4ll dig en planet med tv\u00e5 avlopp, ett i norr och ett i s\u00f6der. I varje avlopp finns en virvel av atmosf\u00e4riska gaser som snurrar runt med h\u00f6g hastighet medan de st\u00f6rtar ner mot ytan. Detta verkar vara vad som h\u00e4nder p\u00e5 jordens systerplanet, Venus, enligt ESA:s rymdsond Venus Express.<\/p>\n<\/div>\n

Europas rymdsond har befunnit sig i omloppsbana runt den andra planeten fr\u00e5n Solen sedan den 11 april 2006. N\u00e5gra av dess allra f\u00f6rsta observationer visade ett m\u00f6rkt, orkanliknande fenomen (kallat en virvel) \u00f6ver sydpolen. En liknande molnstruktur hade redan uppt\u00e4ckts \u00f6ver nordpolen.<\/p>\n

\"The
Orkanens \u00f6ga<\/figcaption><\/figure>\n

Sedan dess har Venus Express kontinuerligt observerat Venus sydpol, och det har visat sig att \u201cvirvelstr\u00f6mmen\u201d i dess centrum \u00e4r f\u00f6rv\u00e5nansv\u00e4rt f\u00f6r\u00e4nderlig. Den 26 februari 2007 hade den formen av ett timglas. 24 timmar tidigare var den n\u00e4stan cirkelformad. Vid andra tillf\u00e4llen framst\u00e5r den som oval (\u00e4ggformad). Det \u00e4r uppenbart att detta fenomen \u00e4ndrar form ganska snabbt.<\/p>\n

Vad orsakar den 2000 km breda virveln? Venus Express har visat att dess centrum \u00e4r varmare \u00e4n omgivningen. Precis som \u00f6gat i en orkan markerar detta varmare omr\u00e5de den plats d\u00e4r atmosf\u00e4riska gaser r\u00f6r sig ned\u00e5t, vilket skapar ett tryckfall vid molntopparna.<\/p>\n

\u201cDen enorma virveln liknar den man kan se i sitt badkar n\u00e4r man har dragit ut proppen\u201d, s\u00e4ger Giuseppe Piccioni, forskare vid Venus Express.<\/p>\n

Forskarna tror att den koldioxidhaltiga atmosf\u00e4ren v\u00e4rms upp av solen vid ekvatorn. Gasen stiger upp och r\u00f6r sig sedan mot polerna. I polaromr\u00e5dena sjunker den ner och bildar det s\u00e5 kallade \u201cavloppet\u201d i atmosf\u00e4ren.<\/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\/sv\/wp-json\/wp\/v2\/posts\/896","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=896"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts\/896\/revisions"}],"predecessor-version":[{"id":4726,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts\/896\/revisions\/4726"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/media?parent=896"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/categories?post=896"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/tags?post=896"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/panel?post=896"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/language?post=896"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/age?post=896"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/duration?post=896"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/resource_type?post=896"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/audience?post=896"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/wf_post_folders?post=896"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}