{"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\/cs\/listen_to_phoenix_descend\/","title":{"rendered":"Poslechn\u011bte si, jak Phoenix kles\u00e1"},"content":{"rendered":"<div class=\"lede\">\n<p>D\u00edky dat\u016fm zaznamenan\u00fdm na palub\u011b sondy Mars Express m\u016f\u017eete sly\u0161et, jak sonda Phoenix kles\u00e1 na povrch Rud\u00e9 planety. Po zpracov\u00e1n\u00ed t\u00fdmem letov\u00e9ho \u0159\u00edzen\u00ed sondy Mars Express jsou zvuky klesaj\u00edc\u00ed sondy Phoenix z\u0159eteln\u011b a hlasit\u011b sly\u0161iteln\u00e9.<\/p>\n<p><a href=\"http:\/\/download.esa.int\/mp3\/EDL_signal_received_by_MELACOM_versus_time_converted_in_Audio_v3.mp3\" target=\"_blank\" rel=\"noopener\"><\/a><a href=\"http:\/\/download.esa.int\/mp3\/EDL_signal_received_by_MELACOM_versus_time_converted_in_Audio_v3.mp3\" target=\"_blank\" rel=\"noopener\">Poslechn\u011bte si to hned<\/a><\/p>\n<\/div>\n<p>Data z komunika\u010dn\u00edho syst\u00e9mu p\u0159ist\u00e1vac\u00edho modulu Mars Express (MELACOM), kter\u00fd sledoval sondu Phoenix, byla na Zemi p\u0159ijata kr\u00e1tce po p\u0159ist\u00e1n\u00ed sondy Phoenix.<\/p>\n<h2>Kdy\u017e sonda Mars Express p\u0159el\u00e9t\u00e1vala nad<\/h2>\n<figure class=\"wp-block-image size-natural\" data-width=\"400\" data-credit=\"ESA\" data-detail-url=\"https:\/\/www.esa.int\/Media\/Animations\/Phoenix_signal_received_by_Mars_Express\" data-licence=\"ESA Standard Licence\" data-licence-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Terms_and_conditions_of_use_of_images_and_videos_available_on_the_esa_website\"><img decoding=\"async\" loading=\"lazy\" style=\"max-width:100%;height:auto\" src=\"https:\/\/www.esa.int\/var\/esa\/storage\/images\/media\/animations\/phoenix_signal_received_by_mars_express\/8477-5-eng-GB\/Phoenix_signal_received_by_Mars_Express.jpg\" alt=\"\"><\/figure>\n<p>Tato animace zn\u00e1zor\u0148uje sign\u00e1l ze sestupu sondy Phoenix, kter\u00fd zaznamenal p\u0159\u00edstroj MELACOM.<\/p>\n<p>\u0160pi\u010dka v animaci, v p\u00e1smu mezi frekvencemi 7 a 8 kilohertz\u016f, zn\u00e1zor\u0148uje vys\u00edl\u00e1n\u00ed p\u0159\u00edmo ze sondy Phoenix.<br \/>P\u0159ist\u00e1vac\u00ed modul je v animaci vid\u011bt p\u0159ibli\u017en\u011b od 342 s po za\u010d\u00e1tku z\u00e1znamu a zmiz\u00ed p\u0159ibli\u017en\u011b v 1085 s. Z\u00e1b\u011br ukazuje, jak sonda Mars Express zachytila sign\u00e1l z Phoenixu a sledovala jej, zat\u00edmco se k p\u0159ist\u00e1vac\u00edmu modulu p\u0159ibli\u017eovala; nejbl\u00ed\u017ee se sonda Mars Express k Phoenixu dostala na vzd\u00e1lenost 1550 km.<br \/>Jakmile se sonda Mars Express vzd\u00e1lila, p\u0159ist\u00e1vac\u00ed modul otev\u0159el pad\u00e1k, odd\u011blil se od sondy a p\u0159ist\u00e1l; sign\u00e1l z p\u0159ist\u00e1vac\u00edho modulu pak ustal.<\/p>\n<p>Posun \u0161pi\u010dky, kter\u00fd je vid\u011bt v animaci, je zp\u016fsoben takzvan\u00fdm Dopplerov\u00fdm jevem, kter\u00fd je velmi podobn\u00fd tomu, co sly\u0161\u00edme, kdy\u017e poslouch\u00e1me p\u00edsk\u00e1n\u00ed proj\u00ed\u017ed\u011bj\u00edc\u00edho vlaku.<\/p>\n<p>Sign\u00e1l se da\u0159ilo sledovat i b\u011bhem o\u010dek\u00e1van\u00e9ho obdob\u00ed p\u0159eru\u0161en\u00ed p\u0159enosu b\u011bhem sestupu, a to a\u017e do okam\u017eiku, kdy se p\u0159ist\u00e1vac\u00ed modul ocitl mimo dosah sondy Mars Express. K tomuto p\u0159eru\u0161en\u00ed p\u0159enosu doch\u00e1z\u00ed v d\u016fsledku ionizace v okol\u00ed sondy, kter\u00e1 se zvy\u0161uje, jak p\u0159ist\u00e1vac\u00ed modul sestupuje atmosf\u00e9rou, a proto se da\u0159\u00ed zachytit pouze velmi slab\u00e9 sign\u00e1ly.<\/p>\n<p>Zbytek z\u00e1znamu, tedy jeho za\u010d\u00e1tek a konec, obsahuje \u0161um na pozad\u00ed, kter\u00fd vytv\u00e1\u0159\u00ed samotn\u00e1 sonda Mars Express.<\/p>\n<h2>Pozn\u00e1mky pro redaktory:<\/h2>","protected":false},"excerpt":{"rendered":"<p>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, [&hellip;]<\/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\/cs\/wp-json\/wp\/v2\/posts\/980","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/comments?post=980"}],"version-history":[{"count":5,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/posts\/980\/revisions"}],"predecessor-version":[{"id":4772,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/posts\/980\/revisions\/4772"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/media?parent=980"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/categories?post=980"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/tags?post=980"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/panel?post=980"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/language?post=980"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/age?post=980"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/duration?post=980"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/resource_type?post=980"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/audience?post=980"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/cs\/wp-json\/wp\/v2\/wf_post_folders?post=980"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}