{"id":980,"date":"2008-06-04T08:45:00","date_gmt":"2008-06-04T06:45:00","guid":{"rendered":"https:\/\/kids.esa.int\/listen_to_phoenix_descend\/"},"modified":"2026-10-08T00:34:28","modified_gmt":"2026-10-07T22:34:28","slug":"listen_to_phoenix_descend","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/da\/listen_to_phoenix_descend\/","title":{"rendered":"Lyt til Phoenix\u2019 nedstigning"},"content":{"rendered":"
\n

Med data indsamlet ombord p\u00e5 Mars Express kan man h\u00f8re Phoenix lande p\u00e5 den r\u00f8de planets overflade. Efter at v\u00e6re blevet bearbejdet af Mars Express\u2019 flyvekontrolteam kan man h\u00f8re lydene fra Phoenix\u2019 nedstigning \u2013 h\u00f8jt og tydeligt.<\/p>\n

<\/a>Lyt nu<\/a><\/p>\n<\/div>\n

Dataene fra Mars Express Lander Communication-systemet (MELACOM), der sporede Phoenix, blev modtaget p\u00e5 Jorden kort efter Phoenix\u2019 landing.<\/p>\n

Da Mars Express fl\u00f8j over<\/h2>\n
\"\"<\/figure>\n

Denne animation viser signalet fra Phoenix\u2019 nedstigning, som er optaget af MELACOM.<\/p>\n

Spidsen i animationen, mellem frekvenserne 7 og 8 kilohertz, viser signalet fra selve Phoenix.
Landingsfart\u00f8jet kan ses i animationen fra ca. 342 sekunder efter starttidspunktet og forsvinder efter ca. 1085 sekunder. Dette viser, hvordan Mars Express opfanger Phoenix-signalet og sporer det, mens den n\u00e6rmer sig landingsfart\u00f8jet; Mars Express kom t\u00e6ttest p\u00e5 Phoenix i en afstand af 1550 km.
Da Mars Express fl\u00f8j v\u00e6k, udl\u00f8ste landingsfart\u00f8jet sin faldsk\u00e6rm, adskilte sig fra rumfart\u00f8jet og landede, hvorefter signalet fra landingsfart\u00f8jet blev afbrudt.<\/p>\n

Den forskydning af spidsen, man ser i animationen, skyldes den s\u00e5kaldte Doppler-effekt, som minder meget om det, vi h\u00f8rer, n\u00e5r vi lytter til fl\u00f8jten fra et forbipasserende tog.<\/p>\n

Signalet blev sporet uden problemer, selv i det forventede periode uden transmission under nedstigningen, indtil landingsfart\u00f8jet var ude af Mars Express\u2019 synsfelt. Perioden uden transmission skyldes ionisering omkring sonden, som \u00f8ges, efterh\u00e5nden som landingsfart\u00f8jet bev\u00e6ger sig ned gennem atmosf\u00e6ren, og hvor der kun kommer meget svage signaler igennem.<\/p>\n

Resten af optagelsen \u2013 b\u00e5de begyndelsen og slutningen \u2013 indeholder baggrundsst\u00f8j, der stammer fra selve Mars Express.<\/p>\n

Bem\u00e6rkninger til redakt\u00f8rerne:<\/h2>","protected":false},"excerpt":{"rendered":"

With data recorded on board Mars Express, you can hear Phoenix descend on to the surface of the Red Planet. After being processed by the Mars Express Flight Control Team, […]<\/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\/06\/phoenix2\/17876331-2-eng-GB\/Phoenix.jpg","esa_banner_description":"","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2008\/06\/Phoenix2","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":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-980","post","type-post","status-publish","format-standard","hentry","category-learn","category-our-universe","category-planets-and-moons","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/980","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=980"}],"version-history":[{"count":5,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/980\/revisions"}],"predecessor-version":[{"id":4772,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/980\/revisions\/4772"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/media?parent=980"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/categories?post=980"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/tags?post=980"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/panel?post=980"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/language?post=980"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/age?post=980"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/duration?post=980"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/resource_type?post=980"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/audience?post=980"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/wf_post_folders?post=980"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}