{"id":9924,"date":"2026-07-09T12:44:27","date_gmt":"2026-07-09T10:44:27","guid":{"rendered":"https:\/\/academiespatiale.fr\/?p=9924"},"modified":"2026-07-09T15:20:02","modified_gmt":"2026-07-09T13:20:02","slug":"article-the-conversation-constellations-de-satellites-et-surveillance-climatique","status":"publish","type":"post","link":"https:\/\/academiespatiale.fr\/index.php\/2026\/07\/09\/article-the-conversation-constellations-de-satellites-et-surveillance-climatique\/","title":{"rendered":"Article The Conversation &#8211; Constellations de satellites et surveillance climatique"},"content":{"rendered":"<nav style=\"color:#9d9d9d;margin-top:-40px;margin-bottom:20px;--separator: &quot;\/&quot;\" class=\"wp-elements-c339e7bf5effc1e7264a263431b75579 wp-block-breadcrumbs has-text-color has-small-font-size\" aria-label=\"Fil d\u2019Ariane\"><ol><li><a href=\"https:\/\/academiespatiale.fr\/\">Accueil<\/a><\/li><li><a href=\"https:\/\/academiespatiale.fr\/index.php\/category\/presse\/\">Presse<\/a><\/li><li><span aria-current=\"page\">Article The Conversation &#8211; Constellations de satellites et surveillance climatique<\/span><\/li><\/ol><\/nav>\n\n\n<p class=\"wp-block-paragraph\"><strong>Juillet 2026 &#8211; Mustapha Meftah, Alain Sarkissian et Philippe Keckhut, directeur de l&rsquo;Acad\u00e9mie Spatiale, ont publi\u00e9 dans <em>The Conversation<\/em> un article intitul\u00e9 \u00ab&nbsp;Comment les constellations de satellites pourraient transformer la surveillance&nbsp;climatique&nbsp;\u00bb.<\/strong><\/p>\n\n\n\n<p class=\"has-background-color-background-color has-background wp-block-paragraph\"><strong>M. Meftah<\/strong>, <strong>A. Sarkissian<\/strong> and <strong>P. Keckhut<\/strong>. <em>Comment les constellations de satellites pourraient transformer la surveillance&nbsp;climatique<\/em>. The Conversation &#8211; 7 juillet 2026. <a href=\"https:\/\/doi.org\/10.64628\/AAK.gn6egtxcg\" target=\"_blank\" rel=\"noopener\" title=\"\">doi: 10.64628\/AAK.gn6egtxcg<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" style=\"margin-top:var(--wp--preset--spacing--70);margin-bottom:var(--wp--preset--spacing--70)\"\/>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><a href=\"https:\/\/theconversation.com\/comment-les-constellations-de-satellites-pourraient-transformer-la-surveillance-climatique-286385\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"155\" src=\"https:\/\/academiespatiale.fr\/wp-content\/uploads\/2026\/07\/image-4-1024x155.png\" alt=\"\" class=\"wp-image-9930\" style=\"aspect-ratio:6.607669616519174;width:311px;height:auto\" srcset=\"https:\/\/academiespatiale.fr\/wp-content\/uploads\/2026\/07\/image-4-1024x155.png 1024w, https:\/\/academiespatiale.fr\/wp-content\/uploads\/2026\/07\/image-4-300x46.png 300w, https:\/\/academiespatiale.fr\/wp-content\/uploads\/2026\/07\/image-4-768x117.png 768w, https:\/\/academiespatiale.fr\/wp-content\/uploads\/2026\/07\/image-4-1536x233.png 1536w, https:\/\/academiespatiale.fr\/wp-content\/uploads\/2026\/07\/image-4-2048x311.png 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n<\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" style=\"margin-top:var(--wp--preset--spacing--70);margin-bottom:var(--wp--preset--spacing--70)\"\/>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\"><em>\u2193 Lire l&rsquo;article \u2193<\/em><\/p>\n\n\n\n<h1 class=\"theconversation-article-title\">Comment les constellations de satellites pourraient transformer la surveillance\u00a0climatique<\/h1>\n\n<div class=\"theconversation-article-body\">\n    <figure>\n      <img decoding=\"async\" alt=\"Carte du monde anim\u00e9e.\" src=\"https:\/\/images.theconversation.com\/files\/745042\/original\/file-20260630-71-yibsp6.gif?ixlib=rb-4.1.0&#038;rect=0%2C0%2C1152%2C648&#038;q=45&#038;auto=format&#038;w=754&#038;fit=clip\" \/>\n        <figcaption>\n          Les \u00e9missions de m\u00e9thane peuvent varier rapidement (ici, une simulation qui montre des modifications sur douze\u00a0heures), mais la fr\u00e9quence de passage des satellites actuels ne permet pas encore de capturer ces \u00e9volutions.\n          <span class=\"attribution\"><span class=\"source\">Mustapha Meftah<\/span>, <span class=\"license\">Fourni par l&rsquo;auteur<\/span><\/span>\n        <\/figcaption>\n    <\/figure>\n\n  <span><a href=\"https:\/\/theconversation.com\/profiles\/mustapha-meftah-2690714\">Mustapha Meftah<\/a>, <em><a href=\"https:\/\/theconversation.com\/institutions\/sorbonne-universite-2467\">Sorbonne Universit\u00e9<\/a><\/em><\/span>\n\n  <p><strong>Pour d\u00e9tecter et r\u00e9guler les \u00e9missions responsables du changement climatique, certains ph\u00e9nom\u00e8nes doivent d\u00e9sormais \u00eatre suivis en temps r\u00e9el, ou presque. Une solution consiste \u00e0 d\u00e9multiplier les instruments d\u2019observation gr\u00e2ce \u00e0 des constellations de satellites. Mais comment faire en sorte que ces constellations \u00e0 but scientifique ne provoquent pas plus de probl\u00e8mes qu\u2019elles ne contribuent \u00e0 en r\u00e9soudre\u00a0?<\/strong><\/p>\n\n<hr>\n\n<p>Les satellites sont devenus indispensables pour observer le changement climatique. Ils mesurent les gaz \u00e0 effet de serre, surveillent les incendies, observent les nuages et suivent l\u2019\u00e9volution des oc\u00e9ans.<\/p>\n\n<p>Mais certains ph\u00e9nom\u00e8nes \u00e9voluent plus vite que le rythme des observations spatiales, ce qui rend leur observation plus difficile. Ainsi, un incendie, un \u00e9pisode de pollution ou une fuite de m\u00e9thane d\u2019origine anthropique (provenant par exemple d\u2019infrastructures p\u00e9troli\u00e8res et gazi\u00e8res, de mines de charbon ou de centres d\u2019enfouissement) peuvent \u00e9voluer plus rapidement que le temps n\u00e9cessaire \u00e0 un satellite pour observer \u00e0 nouveau une m\u00eame r\u00e9gion. Des \u00e9tapes cl\u00e9s de leur \u00e9volution peuvent alors \u00eatre manqu\u00e9es, retardant leur d\u00e9tection, leur localisation et les interventions visant \u00e0 en limiter les impacts.<\/p>\n\n<p>C\u2019est pour cela que la fr\u00e9quence des observations satellitaires devient d\u00e9sormais presque aussi importante que leur pr\u00e9cision. Une des pistes explor\u00e9es consiste \u00e0 d\u00e9ployer des constellations de satellites afin d\u2019augmenter fortement la fr\u00e9quence des mesures depuis l\u2019espace. Dans cette approche, l\u2019objectif n\u2019est plus seulement d\u2019utiliser quelques satellites tr\u00e8s performants, mais \u00e9galement d\u2019observer la Terre beaucoup plus fr\u00e9quemment gr\u00e2ce \u00e0 des constellations compos\u00e9es de dizaines, voire de centaines de satellites.<\/p>\n\n<h2>\u00catre pr\u00e9cis ou \u00eatre rapide\u00a0: le compromis des observations satellitaires actuelles<\/h2>\n\n<p>Ces nouvelles approches s\u2019inscrivent dans la continuit\u00e9 des grandes missions spatiales d\u2019observation du climat, telles que OCO-2, GOSAT ou la famille des satellites Sentinel du programme Copernicus, qui fournissent d\u00e9j\u00e0 des donn\u00e9es essentielles pour suivre l\u2019\u00e9volution de l\u2019atmosph\u00e8re et du cycle du carbone. La plupart de ces missions reposent sur un nombre limit\u00e9 de satellites.<\/p>\n\n<figure class=\"align-center zoomable\">\n            <a aria-label=\"Zoomable image\" href=\"https:\/\/images.theconversation.com\/files\/746076\/original\/file-20260706-57-v25sa6.png?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=1000&amp;fit=clip\"><img decoding=\"async\" alt=\"sch\u00e9ma repr\u00e9sentant de nombreux satellites\" src=\"https:\/\/images.theconversation.com\/files\/746076\/original\/file-20260706-57-v25sa6.png?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip\" srcset=\"https:\/\/images.theconversation.com\/files\/746076\/original\/file-20260706-57-v25sa6.png?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=600&amp;h=450&amp;fit=crop&amp;dpr=1 600w, https:\/\/images.theconversation.com\/files\/746076\/original\/file-20260706-57-v25sa6.png?ixlib=rb-4.1.0&amp;q=30&amp;auto=format&amp;w=600&amp;h=450&amp;fit=crop&amp;dpr=2 1200w, https:\/\/images.theconversation.com\/files\/746076\/original\/file-20260706-57-v25sa6.png?ixlib=rb-4.1.0&amp;q=15&amp;auto=format&amp;w=600&amp;h=450&amp;fit=crop&amp;dpr=3 1800w, https:\/\/images.theconversation.com\/files\/746076\/original\/file-20260706-57-v25sa6.png?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;h=566&amp;fit=crop&amp;dpr=1 754w, https:\/\/images.theconversation.com\/files\/746076\/original\/file-20260706-57-v25sa6.png?ixlib=rb-4.1.0&amp;q=30&amp;auto=format&amp;w=754&amp;h=566&amp;fit=crop&amp;dpr=2 1508w, https:\/\/images.theconversation.com\/files\/746076\/original\/file-20260706-57-v25sa6.png?ixlib=rb-4.1.0&amp;q=15&amp;auto=format&amp;w=754&amp;h=566&amp;fit=crop&amp;dpr=3 2262w\" sizes=\"(min-width: 1466px) 754px, (max-width: 599px) 100vw, (min-width: 600px) 600px, 237px\"><\/a>\n            <figcaption>\n              <span class=\"caption\">Plan de travail.<\/span>\n              <span class=\"attribution\"><span class=\"license\">Fourni par l&rsquo;auteur<\/span><\/span>\n            <\/figcaption>\n          <\/figure>\n\n<figure class=\"align-center zoomable\">\n            <a aria-label=\"Zoomable image\" href=\"https:\/\/images.theconversation.com\/files\/746075\/original\/file-20260706-85-foravo.png?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=1000&amp;fit=clip\"><img decoding=\"async\" alt=\"sch\u00e9ma repr\u00e9sentant de nombreux satellites\" src=\"https:\/\/images.theconversation.com\/files\/746075\/original\/file-20260706-85-foravo.png?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip\" srcset=\"https:\/\/images.theconversation.com\/files\/746075\/original\/file-20260706-85-foravo.png?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=600&amp;h=450&amp;fit=crop&amp;dpr=1 600w, https:\/\/images.theconversation.com\/files\/746075\/original\/file-20260706-85-foravo.png?ixlib=rb-4.1.0&amp;q=30&amp;auto=format&amp;w=600&amp;h=450&amp;fit=crop&amp;dpr=2 1200w, https:\/\/images.theconversation.com\/files\/746075\/original\/file-20260706-85-foravo.png?ixlib=rb-4.1.0&amp;q=15&amp;auto=format&amp;w=600&amp;h=450&amp;fit=crop&amp;dpr=3 1800w, https:\/\/images.theconversation.com\/files\/746075\/original\/file-20260706-85-foravo.png?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;h=566&amp;fit=crop&amp;dpr=1 754w, https:\/\/images.theconversation.com\/files\/746075\/original\/file-20260706-85-foravo.png?ixlib=rb-4.1.0&amp;q=30&amp;auto=format&amp;w=754&amp;h=566&amp;fit=crop&amp;dpr=2 1508w, https:\/\/images.theconversation.com\/files\/746075\/original\/file-20260706-85-foravo.png?ixlib=rb-4.1.0&amp;q=15&amp;auto=format&amp;w=754&amp;h=566&amp;fit=crop&amp;dpr=3 2262w\" sizes=\"(min-width: 1466px) 754px, (max-width: 599px) 100vw, (min-width: 600px) 600px, 237px\"><\/a>\n            <figcaption>\n              <span class=\"caption\">Panorama de plusieurs missions spatiales consacr\u00e9es \u00e0 l\u2019observation du dioxyde de carbone atmosph\u00e9rique depuis l\u2019espace. Certaines privil\u00e9gient la couverture globale, d\u2019autres la r\u00e9solution spatiale ou la fr\u00e9quence des observations.<\/span>\n              <span class=\"attribution\"><a class=\"source\" href=\"https:\/\/database.eohandbook.com\/ghg\/img\/CO2-Observations-May26.png\">Adapt\u00e9 de CEOS et acp.copernicus.org, Source\u00a0: GeoSapient<\/a>, <span class=\"license\">Fourni par l&rsquo;auteur<\/span><\/span>\n            <\/figcaption>\n          <\/figure>\n\n<p>La mesure des gaz \u00e0 effet de serre depuis l\u2019espace est aujourd\u2019hui consid\u00e9r\u00e9e comme un enjeu majeur par les grandes organisations internationales de surveillance de la Terre, comme le <a href=\"https:\/\/earthobservations.org\/\">Groupe d\u2019observations de la Terre (en anglais, Group on Earth Observations, GEO)<\/a> ou le <a href=\"https:\/\/ceos.org\/\">Comit\u00e9 d\u2019observation satellite de la Terre (Committee on Earth Observation Satellites, CEOS)<\/a>.<\/p>\n\n<p>Pour r\u00e9pondre \u00e0 ce besoin, plusieurs missions spatiales sont aujourd\u2019hui en op\u00e9ration, telles que OCO-2, GOSAT ou Sentinel-5P, tandis que d\u2019autres, comme CO2M, sont en pr\u00e9paration. Elles visent \u00e0 mesurer les concentrations de gaz \u00e0 effet de serre avec une pr\u00e9cision toujours plus \u00e9lev\u00e9e. Certaines missions atteignent une pr\u00e9cision de l\u2019ordre de 1 partie par million (1\u00a0ppm) sur la concentration atmosph\u00e9rique de CO\u2082, une performance n\u00e9cessaire pour estimer les sources et les puits de carbone et mieux quantifier les \u00e9changes de CO\u2082 entre l\u2019atmosph\u00e8re, les oc\u00e9ans et les continents.<\/p>\n\n<p>Mais cette pr\u00e9cision s\u2019accompagne d\u2019un compromis\u00a0: pour obtenir des mesures tr\u00e8s pr\u00e9cises et une r\u00e9solution spatiale \u00e9lev\u00e9e, les satellites observent g\u00e9n\u00e9ralement une bande de terrain de largeur limit\u00e9e, ce qui augmente le temps n\u00e9cessaire pour observer \u00e0 nouveau une m\u00eame r\u00e9gion. C\u2019est pr\u00e9cis\u00e9ment cette limite que les constellations cherchent \u00e0 d\u00e9passer en multipliant le nombre de satellites en orbite.<\/p>\n\n<h2>Le m\u00e9thane r\u00e9chauffe l\u2019atmosph\u00e8re bien plus rapidement que le CO\u2082, mais ses \u00e9missions \u00e9voluent trop vite pour les observations actuelles<\/h2>\n\n<p>Le m\u00e9thane illustre particuli\u00e8rement cette difficult\u00e9. Selon le Groupe d\u2019experts intergouvernemental sur l\u2019\u00e9volution du climat <a href=\"https:\/\/www.ipcc.ch\/\">(Giec)<\/a>, le m\u00e9thane r\u00e9chauffe l\u2019atmosph\u00e8re environ 80\u00a0fois plus que le CO\u2082 sur une p\u00e9riode de vingt ans. R\u00e9duire rapidement les \u00e9missions de m\u00e9thane constitue donc un levier important pour limiter le r\u00e9chauffement climatique \u00e0 court terme. Le suivi du m\u00e9thane repose sur la combinaison des observations satellitaires et des mod\u00e8les de transport atmosph\u00e9rique, qui permettent d\u2019estimer la dispersion du m\u00e9thane et l\u2019\u00e9volution de ses \u00e9missions \u00e0 l\u2019\u00e9chelle globale.<\/p>\n\n<figure class=\"align-center zoomable\">\n            <a aria-label=\"Zoomable image\" href=\"https:\/\/images.theconversation.com\/files\/745037\/original\/file-20260630-63-4xio22.jpg?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=1000&amp;fit=clip\"><img decoding=\"async\" alt=\"\" src=\"https:\/\/images.theconversation.com\/files\/745037\/original\/file-20260630-63-4xio22.jpg?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip\" srcset=\"https:\/\/images.theconversation.com\/files\/745037\/original\/file-20260630-63-4xio22.jpg?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=600&amp;h=527&amp;fit=crop&amp;dpr=1 600w, https:\/\/images.theconversation.com\/files\/745037\/original\/file-20260630-63-4xio22.jpg?ixlib=rb-4.1.0&amp;q=30&amp;auto=format&amp;w=600&amp;h=527&amp;fit=crop&amp;dpr=2 1200w, https:\/\/images.theconversation.com\/files\/745037\/original\/file-20260630-63-4xio22.jpg?ixlib=rb-4.1.0&amp;q=15&amp;auto=format&amp;w=600&amp;h=527&amp;fit=crop&amp;dpr=3 1800w, https:\/\/images.theconversation.com\/files\/745037\/original\/file-20260630-63-4xio22.jpg?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;h=662&amp;fit=crop&amp;dpr=1 754w, https:\/\/images.theconversation.com\/files\/745037\/original\/file-20260630-63-4xio22.jpg?ixlib=rb-4.1.0&amp;q=30&amp;auto=format&amp;w=754&amp;h=662&amp;fit=crop&amp;dpr=2 1508w, https:\/\/images.theconversation.com\/files\/745037\/original\/file-20260630-63-4xio22.jpg?ixlib=rb-4.1.0&amp;q=15&amp;auto=format&amp;w=754&amp;h=662&amp;fit=crop&amp;dpr=3 2262w\" sizes=\"(min-width: 1466px) 754px, (max-width: 599px) 100vw, (min-width: 600px) 600px, 237px\"><\/a>\n            <figcaption>\n              <span class=\"caption\">Simulation de la distribution atmosph\u00e9rique du m\u00e9thane \u00e0 l\u2019\u00e9chelle globale \u00e0 douze\u00a0heures d\u2019intervalle. Certaines \u00e9missions peuvent appara\u00eetre puis dispara\u00eetre entre deux\u00a0observations satellitaires, ce qui souligne l\u2019importance d\u2019une surveillance plus fr\u00e9quente.<\/span>\n              <span class=\"attribution\"><span class=\"source\">Mustapha Meftah<\/span>, <span class=\"license\">Fourni par l&rsquo;auteur<\/span><\/span>\n            <\/figcaption>\n          <\/figure>\n\n<p>Les satellites permettent d\u00e9j\u00e0 de d\u00e9tecter certaines \u00e9missions depuis l\u2019espace. Sentinel-5P\/TROPOMI fournit par exemple une couverture quotidienne globale permettant d\u2019identifier de grands \u00ab\u00a0super-\u00e9metteurs\u00a0\u00bb r\u00e9gionaux. D\u2019autres instruments, comme Sentinel-2 ou certains <a href=\"https:\/\/doi.org\/10.1016\/j.rse.2023.113716\">imageurs hyperspectraux<\/a>, permettent d\u2019observer des <a href=\"https:\/\/doi.org\/10.5194\/amt-14-2771-2021\">\u00e9missions beaucoup plus localis\u00e9es<\/a>.<\/p>\n\n<p>Mais certaines \u00e9missions restent intermittentes. Une <a href=\"https:\/\/www.science.org\/doi\/10.1126\/science.abj4351\">fuite de m\u00e9thane peut appara\u00eetre puis dispara\u00eetre entre deux observations<\/a>. Pour les agences environnementales comme pour les industriels, disposer de mesures plus fr\u00e9quentes devient essentiel afin de localiser rapidement ces \u00e9missions et de r\u00e9pondre aux <a href=\"https:\/\/eur-lex.europa.eu\/eli\/reg\/2024\/1787\/oj\">nouvelles exigences de surveillance et de d\u00e9claration des \u00e9missions de gaz \u00e0 effet de serre<\/a> (GES), dans le cadre notamment du <a href=\"https:\/\/taxation-customs.ec.europa.eu\/carbon-border-adjustment-mechanism_en\">CBAM europ\u00e9en<\/a>.<\/p>\n\n<h2>La fr\u00e9quence d\u2019observation, grand int\u00e9r\u00eat scientifique des constellations de\u00a0satellites<\/h2>\n\n<p>C\u2019est pr\u00e9cis\u00e9ment l\u2019int\u00e9r\u00eat des constellations de satellites. Contrairement aux missions spatiales traditionnelles, qui reposent sur quelques plates-formes complexes, ces architectures utilisent plusieurs dizaines de satellites plus petits r\u00e9partis sur plusieurs plans orbitaux, g\u00e9n\u00e9ralement \u00e0 des altitudes comparables. L\u2019objectif est moins de maximiser la performance de chaque satellite que de multiplier les observations au cours d\u2019une m\u00eame journ\u00e9e. Selon les caract\u00e9ristiques des instruments embarqu\u00e9s, une constellation d\u2019une vingtaine \u00e0 quelques dizaines de satellites peut ainsi r\u00e9duire le temps de revisite de plusieurs jours \u00e0 quelques heures.<\/p>\n\n<p>Les avanc\u00e9es dans la <a href=\"https:\/\/www.nasa.gov\/smallsat-institute\/sst-soa\/\">miniaturisation des satellites<\/a> et des <a href=\"https:\/\/www.mdpi.com\/2072-4292\/15\/19\/4876\">instruments<\/a> rendent d\u00e9sormais possibles des capteurs scientifiques plus petits, plus l\u00e9gers et moins co\u00fbteux. Cette miniaturisation permet de d\u00e9velopper des capteurs adapt\u00e9s \u00e0 des besoins d\u2019observation cibl\u00e9s, sans chercher syst\u00e9matiquement \u00e0 maximiser les performances ni la complexit\u00e9 des instruments.<\/p>\n\n<h2>S\u2019int\u00e9grer dans des constellations de t\u00e9l\u00e9communications<\/h2>\n\n<p>Une autre \u00e9volution pourrait \u00e9galement transformer l\u2019observation du climat\u00a0: l\u2019int\u00e9gration de capteurs scientifiques miniaturis\u00e9s \u00e0 bord des satellites appartenant \u00e0 des constellations de t\u00e9l\u00e9communications. Cette approche est notamment \u00e9tudi\u00e9e dans le cadre des futures g\u00e9n\u00e9rations de satellites d\u2019Eutelsat-OneWeb, qui pourraient accueillir des <a href=\"https:\/\/www.airbus.com\/en\/newsroom\/press-releases\/2026-01-airbus-awarded-eutelsat-contract-for-further-340-low-earth-orbit\">charges utiles auxiliaires<\/a>.<\/p>\n\n<p>Plut\u00f4t que de lancer une constellation scientifique enti\u00e8rement d\u00e9di\u00e9e, avec les enjeux associ\u00e9s en termes de <a href=\"https:\/\/theconversation.com\/topics\/debris-spatiaux-156220\">d\u00e9bris spatiaux<\/a>, d\u2019<a href=\"https:\/\/theconversation.com\/destruction-dun-satellite-russe-de-nouveaux-debris-menacent-la-station-spatiale-internationale-151789\">occupation des orbites<\/a> et de <a href=\"https:\/\/theconversation.com\/un-million-de-satellites-la-nouvelle-ruee-vers-lorbite-inquiete-scientifiques-et-juristes-276768\">pollution lumineuse<\/a>, il deviendrait possible d\u2019embarquer de tels instruments \u00e0 bord de ces satellites.<\/p>\n\n<p>Ces infrastructures pourraient ainsi servir \u00e0 la fois aux t\u00e9l\u00e9communications et \u00e0 l\u2019observation du climat, en mutualisant les plates-formes et les lancements, ce qui pourrait r\u00e9duire significativement les co\u00fbts par rapport \u00e0 une constellation scientifique enti\u00e8rement d\u00e9di\u00e9e, tout en augmentant la fr\u00e9quence des observations.<\/p>\n\n<p>Ces nouvelles approches ne remplaceraient pas les grandes missions climatiques institutionnelles, indispensables pour garantir la stabilit\u00e9 et la qualit\u00e9 scientifique des mesures de r\u00e9f\u00e9rence. Elles pourraient en revanche compl\u00e9ter les infrastructures existantes gr\u00e2ce \u00e0 des observations beaucoup plus fr\u00e9quentes de la Terre.<\/p>\n\n<figure class=\"align-center zoomable\">\n            <a aria-label=\"Zoomable image\" href=\"https:\/\/images.theconversation.com\/files\/745039\/original\/file-20260630-63-a3g554.jpg?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=1000&amp;fit=clip\"><img decoding=\"async\" alt=\"\" src=\"https:\/\/images.theconversation.com\/files\/745039\/original\/file-20260630-63-a3g554.jpg?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip\" srcset=\"https:\/\/images.theconversation.com\/files\/745039\/original\/file-20260630-63-a3g554.jpg?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=600&amp;h=338&amp;fit=crop&amp;dpr=1 600w, https:\/\/images.theconversation.com\/files\/745039\/original\/file-20260630-63-a3g554.jpg?ixlib=rb-4.1.0&amp;q=30&amp;auto=format&amp;w=600&amp;h=338&amp;fit=crop&amp;dpr=2 1200w, https:\/\/images.theconversation.com\/files\/745039\/original\/file-20260630-63-a3g554.jpg?ixlib=rb-4.1.0&amp;q=15&amp;auto=format&amp;w=600&amp;h=338&amp;fit=crop&amp;dpr=3 1800w, https:\/\/images.theconversation.com\/files\/745039\/original\/file-20260630-63-a3g554.jpg?ixlib=rb-4.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;h=424&amp;fit=crop&amp;dpr=1 754w, https:\/\/images.theconversation.com\/files\/745039\/original\/file-20260630-63-a3g554.jpg?ixlib=rb-4.1.0&amp;q=30&amp;auto=format&amp;w=754&amp;h=424&amp;fit=crop&amp;dpr=2 1508w, https:\/\/images.theconversation.com\/files\/745039\/original\/file-20260630-63-a3g554.jpg?ixlib=rb-4.1.0&amp;q=15&amp;auto=format&amp;w=754&amp;h=424&amp;fit=crop&amp;dpr=3 2262w\" sizes=\"(min-width: 1466px) 754px, (max-width: 599px) 100vw, (min-width: 600px) 600px, 237px\"><\/a>\n            <figcaption>\n              <span class=\"caption\">Pr\u00e9paration du nanosatellite UVSQ-SAT\u00a0NG avant son lancement en mars\u00a02025. Ces satellites miniaturis\u00e9s ouvrent la voie \u00e0 des observations climatiques plus fr\u00e9quentes depuis l\u2019espace.<\/span>\n              <span class=\"attribution\"><span class=\"source\">Mustapha Meftah<\/span>, <span class=\"license\">Fourni par l&rsquo;auteur<\/span><\/span>\n            <\/figcaption>\n          <\/figure>\n\n<p>La mission fran\u00e7aise <a href=\"https:\/\/www.uvsq.fr\/uvsq-sat-ng\">UVSQ-SAT\u00a0NG<\/a>, d\u00e9velopp\u00e9e par le laboratoire Atmosph\u00e8res, observations spatiales (LATMOS), s\u2019inscrit dans la continuit\u00e9 des missions <a href=\"https:\/\/doi.org\/10.3390\/rs12010092\">UVSQ-SAT<\/a> et <a href=\"https:\/\/doi.org\/10.3390\/rs14010186\">INSPIRE-SAT\u00a07<\/a>, deux\u00a0nanosatellites d\u00e9monstrateurs d\u00e9di\u00e9s \u00e0 l\u2019observation du bilan radiatif de la Terre.<\/p>\n\n<p>UVSQ-SAT\u00a0NG teste de nouvelles approches de miniaturisation pour l\u2019observation du bilan radiatif terrestre et de certains gaz \u00e0 effet de serre depuis une plateforme nanosatellite. Cette mission n\u2019est pas int\u00e9gr\u00e9e \u00e0 une constellation de t\u00e9l\u00e9communications\u00a0; elle constitue un d\u00e9monstrateur technologique destin\u00e9 \u00e0 pr\u00e9parer de futures architectures de constellations scientifiques. Les donn\u00e9es de ces missions sont accessibles librement \u00e0 la communaut\u00e9 scientifique et au public sur la plateforme <a href=\"https:\/\/nahla.projet.latmos.ipsl.fr\/\">NAHLA<\/a>.<!-- Ci-dessous se trouve le compteur de pages de The Conversation. Veuillez ne pas l'enlever. --><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/counter.theconversation.com\/content\/286385\/count.gif?distributor=republish-lightbox-basic\" alt=\"The Conversation\" width=\"1\" height=\"1\" style=\"border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important\" referrerpolicy=\"no-referrer-when-downgrade\" \/><!-- Fin du code. Si vous ne voyez aucun code ci-dessus, veuillez obtenir un nouveau code dans l'onglet \u00ab Avanc\u00e9 \u00bb apr\u00e8s avoir cliqu\u00e9 sur le bouton \u00ab Republier \u00bb. Le compteur de pages ne collecte aucune donn\u00e9e personnelle. Plus d'informations : http:\/\/theconversation.com\/republishing-guidelines --><\/p>\n\n  <p><span><a href=\"https:\/\/theconversation.com\/profiles\/mustapha-meftah-2690714\">Mustapha Meftah<\/a>, Chercheur au LATMOS\/CNRS\/UVSQ\/SU et professeur \u00e0 l&rsquo;UVSQ, sp\u00e9cialis\u00e9 en physique solaire, sciences de l&rsquo;atmosph\u00e8re, instrumentation spatiale et missions satellitaires, <em><a href=\"https:\/\/theconversation.com\/institutions\/sorbonne-universite-2467\">Sorbonne Universit\u00e9<\/a><\/em><\/span><\/p>\n\n  <p>Cet article est republi\u00e9 \u00e0 partir de <a href=\"https:\/\/theconversation.com\">The Conversation<\/a> sous licence Creative Commons. Lire l\u2019<a href=\"https:\/\/theconversation.com\/comment-les-constellations-de-satellites-pourraient-transformer-la-surveillance-climatique-286385\">article original<\/a>.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Juillet 2026 &#8211; Mustapha Meftah, Alain Sarkissian et Philippe Keckhut, directeur de l&rsquo;Acad\u00e9mie Spatiale, ont publi\u00e9 dans The Conversation un article intitul\u00e9 \u00ab&nbsp;Comment les constellations de satellites pourraient transformer la surveillance&nbsp;climatique&nbsp;\u00bb. M. Meftah, A. Sarkissian and P. Keckhut. Comment les constellations de satellites pourraient transformer la surveillance&nbsp;climatique. The Conversation &#8211; [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":9931,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_EventAllDay":false,"_EventTimezone":"","_EventStartDate":"","_EventEndDate":"","_EventStartDateUTC":"","_EventEndDateUTC":"","_EventShowMap":false,"_EventShowMapLink":false,"_EventURL":"","_EventCost":"","_EventCostDescription":"","_EventCurrencySymbol":"","_EventCurrencyCode":"","_EventCurrencyPosition":"","_EventDateTimeSeparator":"","_EventTimeRangeSeparator":"","_EventOrganizerID":[],"_EventVenueID":[],"_OrganizerEmail":"","_OrganizerPhone":"","_OrganizerWebsite":"","_VenueAddress":"","_VenueCity":"","_VenueCountry":"","_VenueProvince":"","_VenueState":"","_VenueZip":"","_VenuePhone":"","_VenueURL":"","_VenueStateProvince":"","_VenueLat":"","_VenueLng":"","_VenueShowMap":false,"_VenueShowMapLink":false,"footnotes":""},"categories":[7,35],"tags":[],"class_list":["post-9924","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-presse","category-secteur-spatial"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.9 - aioseo.com -->\n\t<meta name=\"description\" content=\"Juillet 2026 - Mustapha Meftah, Alain Sarkissian et Philippe Keckhut, directeur de l&#039;Acad\u00e9mie Spatiale, ont publi\u00e9 dans The Conversation un article intitul\u00e9 \u00ab Comment les constellations de satellites pourraient transformer la surveillance climatique \u00bb. 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