{"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\/da\/a_swirling_atmospheric_sink_on_venus\/","title":{"rendered":"En hvirvlende atmosf\u00e6risk s\u00e6nke p\u00e5 Venus"},"content":{"rendered":"
\n

Forestil dig en planet med to afl\u00f8b, det ene i nord og det andet i syd. I hvert afl\u00f8b findes der en hvirvelstr\u00f8m af atmosf\u00e6riske gasser, der hvirvler rundt med h\u00f8j hastighed, mens de styrter ned mod overfladen. Det ser ud til at v\u00e6re netop det, der sker p\u00e5 Jordens s\u00f8sterplanet, Venus, if\u00f8lge ESA\u2019s rumfart\u00f8j Venus Express.<\/p>\n<\/div>\n

Europas robotudforsker har kredset om den anden planet fra Solen siden den 11. april 2006. Nogle af dens allerf\u00f8rste observationer viste et m\u00f8rkt, orkanlignende f\u00e6nomen (kendt som en hvirvel) over sydpolen. En lignende skystruktur var allerede blevet fundet over nordpolen.<\/p>\n

\"The
Orkanens \u00f8je<\/figcaption><\/figure>\n

Siden da har Venus Express konstant observeret Venus\u201c sydpol, og midten af \u201dhvirvelstr\u00f8mmen\u00ab har vist sig at v\u00e6re overraskende foranderlig. Den 26. februar 2007 havde den form som et timeglas. 24 timer tidligere var den n\u00e6sten cirkelformet. Andre gange fremst\u00e5r den oval (\u00e6gformet). Det er tydeligt, at dette f\u00e6nomen skifter form ganske hurtigt.<\/p>\n

Hvad er \u00e5rsagen til den 2000 km brede hvirvel? Venus Express har vist, at dens centrum er varmere end omgivelserne. Ligesom \u00f8jet i en orkan markerer dette varmere omr\u00e5de det sted, hvor atmosf\u00e6riske gasser bev\u00e6ger sig nedad og skaber et lavtryk ved skytoppene.<\/p>\n

\u201cDen enorme hvirvel ligner den, man kan se i sit badekar, n\u00e5r man har trukket proppen ud,\u201d siger Giuseppe Piccioni, forsker p\u00e5 Venus Express-missionen.<\/p>\n

Forskere mener, at atmosf\u00e6ren, der best\u00e5r af kuldioxid, opvarmes af Solen ved \u00e6kvator. Gassen stiger op og bev\u00e6ger sig derefter mod polerne. I polaromr\u00e5derne synker den ned og danner dermed det atmosf\u00e6riske \u201cafl\u00f8b\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\/da\/wp-json\/wp\/v2\/posts\/896","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/comments?post=896"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/896\/revisions"}],"predecessor-version":[{"id":4726,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/896\/revisions\/4726"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/media?parent=896"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/categories?post=896"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/tags?post=896"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/panel?post=896"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/language?post=896"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/age?post=896"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/duration?post=896"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/resource_type?post=896"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/audience?post=896"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/wf_post_folders?post=896"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}