{"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\/fi\/listen_to_phoenix_descend\/","title":{"rendered":"Kuuntele, kuinka Phoenix laskeutuu"},"content":{"rendered":"
\n

Mars Express -luotaimella tallennettujen tietojen avulla voit kuulla, kuinka Phoenix laskeutuu Punaisen planeetan pinnalle. Mars Expressin lennonvalvontatiimin k\u00e4sittelyn j\u00e4lkeen Phoenixin laskeutumisen \u00e4\u00e4net kuuluvat selv\u00e4sti ja voimakkaasti.<\/p>\n

<\/a>Kuuntele nyt<\/a><\/p>\n<\/div>\n

Phoenixia seuranneen Mars Express Lander Communication System (MELACOM) -j\u00e4rjestelm\u00e4n tiedot vastaanotettiin Maassa pian Phoenixin laskeutumisen j\u00e4lkeen.<\/p>\n

Kun Mars Express lensi yli<\/h2>\n
\"\"<\/figure>\n

T\u00e4m\u00e4 animaatio esitt\u00e4\u00e4 Phoenixin laskeutumisen signaalin, jonka MELACOM on tallentanut.<\/p>\n

Animaatiossa n\u00e4kyv\u00e4 piikki, taajuusalueella 7\u20138 kilohertsi\u00e4, osoittaa Phoenixin omasta l\u00e4hett\u00e4m\u00e4\u00e4 signaalia.
Laskeutumisalus n\u00e4kyy animaatiossa noin 342 sekunnin kohdalta alkaen ja katoaa n\u00e4kyvist\u00e4 noin 1085 sekunnin kohdalla. T\u00e4m\u00e4 osoittaa, kuinka Mars Express havaitsi Phoenixin signaalin ja seurasi sit\u00e4 l\u00e4hestyess\u00e4\u00e4n laskeutumisalusta; Mars Expressin l\u00e4hin et\u00e4isyys Phoenixista oli 1550 km.
Kun Mars Express lensi pois, laskeutumisalus avasi laskuvarjonsa, irtosi aluksesta ja laskeutui, mink\u00e4 j\u00e4lkeen yhteys laskeutumisaluksesta katkesi.<\/p>\n

Animaatiossa n\u00e4kyv\u00e4 piikin siirtyminen johtuu niin sanotusta Doppler-ilmi\u00f6st\u00e4, joka on hyvin samanlainen kuin se, mit\u00e4 kuulemme kuunnellessamme ohikulkevan junan pillin \u00e4\u00e4nt\u00e4.<\/p>\n

Signaalia seurattiin onnistuneesti jopa laskeutumisen aikana odotetun l\u00e4hetyskatkoksen aikana, kunnes laskeutumisalus katosi Mars Expressin n\u00e4k\u00f6kent\u00e4st\u00e4. L\u00e4hetyskatkos johtuu luotaimen ymp\u00e4rill\u00e4 tapahtuvasta ionisaatiosta, joka voimistuu laskeutumisaluksen laskeutuessa ilmakeh\u00e4n l\u00e4pi, jolloin l\u00e4pi p\u00e4\u00e4see vain hyvin heikkoja signaaleja.<\/p>\n

Tallenteen loppuosa, eli alku ja loppu, sis\u00e4lt\u00e4\u00e4 Mars Expressin itsens\u00e4 tuottamaa taustakohinaa.<\/p>\n

Huomautuksia toimittajille:<\/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\/fi\/wp-json\/wp\/v2\/posts\/980","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/comments?post=980"}],"version-history":[{"count":5,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/980\/revisions"}],"predecessor-version":[{"id":4772,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/980\/revisions\/4772"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=980"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=980"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=980"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=980"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=980"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=980"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=980"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=980"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=980"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=980"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}