{"id":69556,"date":"2025-07-03T12:00:00","date_gmt":"2025-07-03T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/politique\/mtg-s1-et-sentinel-4-revolutionnent-meteo-et-pollution"},"modified":"2025-07-04T05:42:54","modified_gmt":"2025-07-04T05:42:54","slug":"mtg-s1-et-sentinel-4-revolutionnent-meteo-et-pollution","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/mtg-s1-et-sentinel-4-revolutionnent-meteo-et-pollution","title":{"rendered":"MTG-S1 et Sentinel-4 R\u00e9volutionnent M\u00e9t\u00e9o et Pollution"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Senegal. <\/strong><\/span>Le 1er juillet 2025, au plus fort de la vague de chaleur qui e\u0301crase l\u2019Europe, il faisait 36\u00b0C a\u0300 Darmstadt (Allemagne), au pied du vaste sie\u0300ge d\u2019Eumetsat, l\u2019organisation europe\u0301enne pour l\u2019exploitation des satellites me\u0301te\u0301orologiques. L\u2019ambiance e\u0301tait particulie\u0300rement enjoue\u0301e, alors que le jour de\u0301clinait peu a\u0300 peu, dans une chaleur toujours e\u0301touffante. Dans la salle du conseil, les personnes implique\u0301es dans la mise au point du satellite MTGS-1 du programme \u00ab Meteosat Troisie\u0300me Ge\u0301ne\u0301ration \u00bb se sont succe\u0301de\u0301 sur sce\u0300ne pour expliquer les particularite\u0301s de ce sondeur de l\u2019atmosphe\u0300re et qui aura pour mission de cartographier l\u2019atmosphe\u0300re terrestre en 3D.<\/p>\n<p><b>\u00ab Il y avait beaucoup de frayeurs dans la salle \u00bb<\/b><\/p>\n<p>Alors que l\u2019on approchait de 23h, l\u2019ambiance s\u2019est soudain tendue, tandis qu\u2019apparaissait a\u0300 l\u2019e\u0301cran l\u2019image du lanceur Falcon 9 de SpaceX sur son pas de tir a\u0300 Cap Canaveral, en Floride (Etats-Unis). Le silence s\u2019est fait tandis que s\u2019e\u0301grenait l\u2019ultime de\u0301compte jusqu\u2019au puissant de\u0301collage du premier moteur, a\u0300 23h04, qui s\u2019est e\u0301leve\u0301 longuement dans le ciel clair avant de se se\u0301parer et revenir se poser sur sa barge en mer, tandis que les e\u0301tapes suivantes se de\u0301roulaient sans encombre. A chaque e\u0301tape franchie, les visages s\u2019e\u0301clairaient, les mains se serraient. Et lorsque la se\u0301quence s\u2019est acheve\u0301e sur un lancement re\u0301ussi, les accolades ont succe\u0301de\u0301 aux longs applaudissements.<\/p>\n<p>\u00ab Il y avait beaucoup de frayeurs dans la salle, reconnai\u0302t Bertrand Denis, directeur de l\u2019observation, de la science et de l\u2019exploration chez Thale\u0300s Alenia Space. Pour nombre de personnes qui ont participe\u0301 a\u0300 MTGS-1, c\u2019est 12 a\u0300 15 ans de travail qui se jouent sur une se\u0301quence qui dure une heure, et ou\u0300 a\u0300 chaque seconde, on a envie que cela marche. \u00bb<\/p>\n<p><b>Six satellites a\u0300 terme<\/b><\/p>\n<p>MTG-S1 est de\u0301sormais en route pour rejoindre en orbite ge\u0301ostationnaire (a\u0300 36.000 km d\u2019altitude) le premier satellite imageur, MTG-I1, a\u0300 poste depuis 2022. \u00ab Ce qui est important avec ce lancement, explique Bertrand Denis, c\u2019est que les deux satellites composent le de\u0301but d\u2019une constellation: le premier satellite permettait d\u2019avoir une image en 2D, et ce second offre une vision en 3D de l\u2019atmosphe\u0300re, ce qui va ame\u0301liorer les pre\u0301visions me\u0301te\u0301orologiques a\u0300 l\u2019e\u0301chelle re\u0301gionale et mondiale. \u00bb A terme, cette nouvelle constellation me\u0301te\u0301orologiques sera constitue\u0301e de six satellites: quatre satellites imageurs et deux sondeurs atmosphe\u0301riques, qui devraient offrir des capacite\u0301s de pre\u0301vision parmi les plus performantes au monde.<\/p>\n<p>Un gain de qualite\u0301 qui devrait de\u0301passer les frontie\u0300res europe\u0301ennes, puisque depuis 1977 les satellites Meteosat constituent la principale source de donne\u0301es me\u0301te\u0301orologiques pour l\u2019Afrique e\u0301galement et que leurs donne\u0301es contribuent au syste\u0300me mondial d\u2019observation de l\u2019Organisation me\u0301te\u0301orologique mondiale (OMM).<\/p>\n<p>MTG-S1 est e\u0301quipe\u0301 du premier sondeur infrarouge hyperspectral europe\u0301en destine\u0301 a\u0300 une orbite ge\u0301ostationnaire. Il mesure finement la tempe\u0301rature et l\u2019humidite\u0301 selon la latitude, la longitude et l\u2019altitude, ce qui permet de visualiser toutes les 30 minutes un cube d\u2019atmosphe\u0300re au-dessus de l\u2019Europe, et, par exemple, de de\u0301tecter en amont les signes avant-coureurs de tempe\u0302tes. Les images de la Terre sont quant a\u0300 elles re\u0301actualise\u0301es toutes les 10 minutes contre 15 minutes auparavant, et celles de l\u2019Europe le sont toutes les 2,5 minutes !<\/p>\n<p><b>Sentinel-4 fournira toutes les heures des donne\u0301es sur les polluants de l\u2019air<\/b><\/p>\n<p>Pour la premie\u0300re fois, un satellite me\u0301te\u0301orologique d\u2019Eumetsat, en l\u2019occurrence MTG-S1, emporte e\u0301galement a\u0300 son bord un instrument destine\u0301 a\u0300 comple\u0301ter le programme europe\u0301en d\u2019observation de la Terre Copernicus. Il s\u2019agit de l\u2019instrument Sentinel-4, re\u0301alise\u0301 par Airbus Defence and Space. Il a pour mission la surveillance de la qualite\u0301 de l\u2019air et des concentrations de gaz a\u0300 effet de serre depuis l\u2019orbite ge\u0301ostationnaire, une orbite tre\u0300s stable qui lui permet de rester concentre\u0301 sur l\u2019Europe et le nord de l\u2019Afrique. Dote\u0301 d\u2019un spectrome\u0300tre ultraviolet, visible et proche de l\u2019infrarouge, Sentinel-4 fournira toutes les heures des donne\u0301es sur les ae\u0301rosols, l\u2019ozone, le dioxyde d\u2019azote et le dioxyde de soufre dans notre atmosphe\u0300re. Il de\u0301tectera ainsi des panaches de pollutions, de poussie\u0300res du de\u0301sert, de fume\u0301es d\u2019incendies, etc.<\/p>\n<p>Sentinel-4 est le premier instrument entie\u0300rement de\u0301die\u0301 a\u0300 la de\u0301tection des pollutions de l\u2019air, ce qui permettra d\u2019e\u0301valuer la qualite\u0301 de ce que nous respirons et fournira des donne\u0301es indispensables pour les de\u0301cideurs de politiques publiques. \u00ab Aujourd\u2019hui, 7 millions de personnes meurent chaque anne\u0301e de pollutions atmosphe\u0301riques, souligne Simonetta Cheli, directrice des programmes d\u2019observation de la Terre de l\u2019Agence spatiale europe\u0301enne (ESA), dont 500.000 en Europe. Ce nouvel instrument doit permettre l\u2019ame\u0301lioration des services de surveillance de l\u2019atmosphe\u0300re. \u00bb<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">Senegal<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Senegal. Le 1er juillet 2025, au plus fort de la vague de chaleur qui e\u0301crase l\u2019Europe, il faisait 36\u00b0C a\u0300 Darmstadt (Allemagne), au pied du vaste sie\u0300ge d\u2019Eumetsat, l\u2019organisation europe\u0301enne pour l\u2019exploitation des satellites me\u0301te\u0301orologiques. L\u2019ambiance e\u0301tait particulie\u0300rement enjoue\u0301e, alors que le jour de\u0301clinait peu a\u0300 peu, dans une chaleur toujours e\u0301touffante. Dans [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":69555,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[44],"class_list":["post-69556","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-senegal-2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>MTG-S1 et Sentinel-4 R\u00e9volutionnent M\u00e9t\u00e9o et Pollution - Senegal<\/title>\n<meta name=\"description\" content=\"Le 1er juillet 2025, au plus fort de la vague de chaleur qui e\u0301crase l\u2019Europe, il faisait 36\u00b0C a\u0300 Darmstadt (Allemagne), ...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/mtg-s1-et-sentinel-4-revolutionnent-meteo-et-pollution\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MTG-S1 et Sentinel-4 R\u00e9volutionnent M\u00e9t\u00e9o et Pollution\" \/>\n<meta property=\"og:description\" content=\"Le 1er juillet 2025, au plus fort de la vague de chaleur qui e\u0301crase l\u2019Europe, il faisait 36\u00b0C a\u0300 Darmstadt (Allemagne), ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/mtg-s1-et-sentinel-4-revolutionnent-meteo-et-pollution\" \/>\n<meta property=\"og:site_name\" content=\"Senegal\" \/>\n<meta property=\"article:published_time\" content=\"2025-07-03T12:00:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-07-04T05:42:54+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2025\/07\/sm_1751594732.412289.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"900\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"cfeditorfr\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"cfeditorfr\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/mtg-s1-et-sentinel-4-revolutionnent-meteo-et-pollution#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/mtg-s1-et-sentinel-4-revolutionnent-meteo-et-pollution\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"MTG-S1 et Sentinel-4 R\u00e9volutionnent M\u00e9t\u00e9o et Pollution\",\"datePublished\":\"2025-07-03T12:00:00+00:00\",\"dateModified\":\"2025-07-04T05:42:54+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/mtg-s1-et-sentinel-4-revolutionnent-meteo-et-pollution\"},\"wordCount\":895,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/mtg-s1-et-sentinel-4-revolutionnent-meteo-et-pollution#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2025\/07\/sm_1751594732.412289.jpg\",\"keywords\":[\"Senegal\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/mtg-s1-et-sentinel-4-revolutionnent-meteo-et-pollution#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/mtg-s1-et-sentinel-4-revolutionnent-meteo-et-pollution\",\"url\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/mtg-s1-et-sentinel-4-revolutionnent-meteo-et-pollution\",\"name\":\"MTG-S1 et Sentinel-4 R\u00e9volutionnent M\u00e9t\u00e9o et Pollution - 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