{"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\/fr\/listen_to_phoenix_descend\/","title":{"rendered":"\u00c9coute la descente de Phoenix"},"content":{"rendered":"
\n

Gr\u00e2ce aux donn\u00e9es enregistr\u00e9es \u00e0 bord de Mars Express, tu peux \u00e9couter Phoenix descendre vers la surface de la plan\u00e8te rouge. Une fois trait\u00e9s par l'\u00e9quipe de contr\u00f4le de vol de Mars Express, les sons de la descente de Phoenix sont, en effet, audibles, puissants et clairs.<\/p>\n

<\/a>\u00c9coute maintenant!<\/a><\/p>\n<\/div>\n

Les donn\u00e9es provenant du syst\u00e8me de communication de la sonde Mars Express (MELACOM) qui a suivi Phoenix ont \u00e9t\u00e9 re\u00e7ues sur Terre peu apr\u00e8s l'atterrissage de Phoenix.<\/p>\n

Alors que Mars Express survolait<\/h2>\n
\"\"<\/figure>\n

Cette animation montre les signaux enregistr\u00e9s pendant la descente de Phoenix par le syst\u00e8me MELACOM.<\/p>\n

Le pic observ\u00e9 sur le graphique, entre 7 et 8 kilohertz, correspond au signal \u00e9mis par Phoenix lui-m\u00eame.
L'atterrisseur est visible dans l'animation \u00e0 partir d'environ 342 s apr\u00e8s le d\u00e9but de la vid\u00e9o et dispara\u00eet vers 1 085 s. On y voit Mars Express capter le signal de Phoenix et le suivre tout en se rapprochant de l'atterrisseur ; Mars Express s'est approch\u00e9 de Phoenix jusqu'\u00e0 une distance de 1 550 km.
Alors que Mars Express s'\u00e9loignait, l'atterrisseur a d\u00e9ploy\u00e9 son parachute, s'est d\u00e9tach\u00e9 de la sonde et s'est pos\u00e9 ; le signal provenant de l'atterrisseur a alors \u00e9t\u00e9 interrompu.<\/p>\n

Le mouvement du corps central dans l'animation est d\u00fb \u00e0 l'effet dit de Doppler, qui est tr\u00e8s proche de ce que nous entendons lorsque nous \u00e9coutons le sifflement d'un train qui passe.<\/p>\n

Le signal a \u00e9t\u00e9 suivi avec succ\u00e8s, m\u00eame pendant l'intervalle attendu de black-out de la transmission en phase de descente, et ce, jusqu'\u00e0 ce que le lander sorte du champ de vue de Mars Express.<\/p>\n

Le reste de l'enregistrement, c'est-\u00e0-dire le d\u00e9but et la fin, contient des bruits de fond g\u00e9n\u00e9r\u00e9s par Mars Express elle-m\u00eame.<\/p>\n

Notes \u00e0 l'attention des r\u00e9dacteurs :<\/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\/fr\/wp-json\/wp\/v2\/posts\/980","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/comments?post=980"}],"version-history":[{"count":5,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/980\/revisions"}],"predecessor-version":[{"id":4772,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/980\/revisions\/4772"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/media?parent=980"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/categories?post=980"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/tags?post=980"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/panel?post=980"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/language?post=980"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/age?post=980"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/duration?post=980"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/resource_type?post=980"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/audience?post=980"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/wf_post_folders?post=980"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}