{"id":897,"date":"2008-06-17T09:24:00","date_gmt":"2008-06-17T07:24:00","guid":{"rendered":"https:\/\/kids.esa.int\/goce_esa_s_gravity_explorer\/"},"modified":"2026-10-08T00:33:31","modified_gmt":"2026-10-07T22:33:31","slug":"goce_esa_s_gravity_explorer","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fr\/goce_esa_s_gravity_explorer\/","title":{"rendered":"GOCE \u2013 L\u2019explorateur de gravit\u00e9 de l\u2019ESA"},"content":{"rendered":"<div class=\"lede\">\n<p>Saviez-vous que votre poids varie l\u00e9g\u00e8rement selon l\u2019endroit o\u00f9 vous vivez ? Cela s\u2019explique par le fait que l\u2019attraction gravitationnelle de la Terre varie d\u2019un endroit \u00e0 l\u2019autre. C\u2019est pr\u00e9cis\u00e9ment l\u2019ampleur de ces variations qui est actuellement mesur\u00e9e par le satellite GOCE (Gravity field and steady-state Ocean Circulation Explorer) de l\u2019ESA.<\/p>\n<\/div>\n<p>Lanc\u00e9 en mars 2009, GOCE est la premi\u00e8re des missions \u2018 Earth Explorer \u2019 de l'ESA. Sa mission consiste \u00e0 fournir les donn\u00e9es les plus pr\u00e9cises \u00e0 ce jour sur le \u00ab champ gravitationnel \u00bb de la plan\u00e8te.<\/p>\n<p>Savez-vous que notre poids varie l\u00e9g\u00e8rement selon l'endroit o\u00f9 l'on vit ? Cela est d\u00fb aux diff\u00e9rences de champ de gravit\u00e9 terrestre d'un endroit \u00e0 l'autre. L\u2019ampleur pr\u00e9cise des variations de gravit\u00e9, voil\u00e0 ce que mesure le satellite GOCE (satellite d\u2019\u00e9tude de la gravit\u00e9 et de la circulation oc\u00e9anique en r\u00e9gime stable) de l\u2019ESA. Lanc\u00e9 en mars 2009, GOCE est la premi\u00e8re mission d\u2019exploration de la Terre de l\u2019Esa. Son objectif est de fournir les informations les plus pr\u00e9cises jamais obtenues sur le \u00ab champ de gravit\u00e9 \u00bb de notre plan\u00e8te.<\/p>\n<figure class=\"wp-block-image size-large\" data-width=\"1200\" data-credit=\"ESA\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2008\/05\/Earth_s_geoid_as_seen_by_GOCE2\" 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\/esa_multimedia\/images\/2008\/05\/earth_s_geoid_as_seen_by_goce2\/17878996-2-eng-GB\/Earth_s_geoid_as_seen_by_GOCE.jpg\" alt=\"Earth&#x27;s geoid as seen by GOCE\"><figcaption>Le g\u00e9o\u00efde terrestre tel que le per\u00e7oit GOCE<\/figcaption><\/figure>\n<p>Mesurer les infimes variations de l'attraction gravitationnelle est tr\u00e8s difficile, surtout depuis l'espace. Afin de capter le meilleur signal gravitationnel possible, GOCE suit une orbite basse, \u00e0 255 km au-dessus de la Terre. Lorsqu\u2019il survole des r\u00e9gions dont l\u2019attraction gravitationnelle est plus ou moins forte, l\u2019appareil monte ou descend et ses instruments enregistrent ces changements tout au long de sa trajectoire.<\/p>\n<p>GOCE, qui a la forme d'une fl\u00e8che, est \u00e9galement ultra stable et exempt des parties amovibles dont sont souvent dot\u00e9s les autres satellites.<\/p>\n<p>Pourquoi la mesure pr\u00e9cise de la gravit\u00e9 est-elle si importante ? Les donn\u00e9es transmises par GOCE servent \u00e0 l'\u00e9tude des courants oc\u00e9aniques, du changement de niveau de la mer, de la hauteur de la surface terrestre et de la profondeur des racines des montagnes. Elles trouvent \u00e9galement de nombreuses applications pratiques, comme par exemple dans le secteur du b\u00e2timent.<\/p>","protected":false},"excerpt":{"rendered":"<p>Did you know that your weight is slightly different, depending on where you live? This is because the pull of Earth\u2019s gravity varies from place to place. Precisely how much [&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\/03\/sunny_side_of_goce3\/17887395-2-eng-GB\/Sunny_side_of_GOCE.jpg","esa_banner_description":"Sunny side of GOCE","esa_banner_credit":"ESA\u2013AOES-Medialab","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2008\/03\/Sunny_side_of_GOCE3","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":[42,10,66],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-897","post","type-post","status-publish","format-standard","hentry","category-earth","category-learn","category-water-world"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/897","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=897"}],"version-history":[{"count":5,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/897\/revisions"}],"predecessor-version":[{"id":4727,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/897\/revisions\/4727"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/media?parent=897"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/categories?post=897"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/tags?post=897"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/panel?post=897"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/language?post=897"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/age?post=897"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/duration?post=897"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/resource_type?post=897"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/audience?post=897"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/wf_post_folders?post=897"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}