{"id":15516,"date":"2022-03-14T17:07:49","date_gmt":"2022-03-14T17:07:49","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=15516"},"modified":"2025-09-16T16:28:09","modified_gmt":"2025-09-16T16:28:09","slug":"tourbillons-de-poussiere-au-milieu-des-dunes-martiennes","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/03\/14\/tourbillons-de-poussiere-au-milieu-des-dunes-martiennes\/","title":{"rendered":"Tourbillons de poussi\u00e8re au milieu des dunes martiennes"},"content":{"rendered":"<p><strong>Des tourbillons de poussi\u00e8re dessinent d&#8217;\u00e9tranges motifs au milieu des dunes martiennes sous le regard de l&#8217;orbiteur europ\u00e9en TGO.<\/strong><\/p>\n<h5>Comme sur Terre :<\/h5>\n<p>En orbite autour de la plan\u00e8te <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/04\/02\/mars-derriere-la-lune-depuis-lobservatoire-de-kitt-peak\/\" target=\"_blank\" rel=\"noopener\">Mars<\/a> depuis 2018, la sonde europ\u00e9enne Trace Gas Orbiter (<a href=\"https:\/\/exploration.esa.int\/web\/mars\/-\/46475-trace-gas-orbiter\" target=\"_blank\" rel=\"noopener\">TGO<\/a>) a r\u00e9alis\u00e9 cette \u00e9tonnante image. Ces traces sombres qui s\u2019entortillent sur le sol ont \u00e9t\u00e9 produites par des tourbillons de poussi\u00e8re. Le ph\u00e9nom\u00e8ne est\u00a0 analogue \u00e0 ce que l\u2019on observe dans certains d\u00e9serts terrestres. Ces tourbillons sont appel\u00e9s \u00ab <em>dust devils<\/em> \u00bb aux \u00c9tats-Unis. Ils se produisent quand de l&#8217;air chaud au niveau d&#8217;un sol d\u00e9sertique monte rapidement dans de l&#8217;air plus froid. Bien qu&#8217;ils ne durent en g\u00e9n\u00e9ral que quelques minutes, ils peuvent s\u2019\u00e9lever jusqu\u2019\u00e0 8 kilom\u00e8tres d\u2019altitude :<\/p>\n<figure id=\"attachment_15517\" aria-describedby=\"caption-attachment-15517\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/02\/esa_mars.jpg\" rel=\"lightbox[15516]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15517\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/02\/esa_mars-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/02\/esa_mars-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/02\/esa_mars-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/02\/esa_mars-768x460.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/02\/esa_mars.jpg 1501w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-15517\" class=\"wp-caption-text\">En orbite autour de Mars, TGO a photographi\u00e9 les traces laiss\u00e9es par des tourbillons de poussi\u00e8re avec des filtres pour en accentuer le contraste. \u00a9<a href=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2022\/02\/The_devil_s_in_the_detail\" target=\"_blank\" rel=\"noopener\"> ESA\/Roscosmos\/CaSSIS<\/a><\/figcaption><\/figure>\n<p>Sur Mars, ils soul\u00e8vent la poussi\u00e8re ocre, d\u00e9voilant alors le sable en dessous, plus sombre et plus lourd. L&#8217;utilisation de filtres donne cet aspect particulier \u00e0 l&#8217;image, permettant de mieux voir les traces (en bleu) de leurs passages.<\/p>\n<h5>Vents martiens :<\/h5>\n<p>On sait depuis bien longtemps que les vents soufflent sur la\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/09\/22\/en-video-le-survol-du-pole-sud-de-la-planete-mars\/\" target=\"_blank\" rel=\"noopener\">Plan\u00e8te rouge<\/a>. Avec leurs t\u00e9lescopes, les astronomes ont assist\u00e9 \u00e0 plusieurs temp\u00eates. Elles sont suffisamment importantes pour soulever de grandes quantit\u00e9s de poussi\u00e8re et masquer les paysages durant plusieurs semaines. En 1971, une temp\u00eate se produisit lors de l\u2019arriv\u00e9e en orbite de <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Mariner_9\" target=\"_blank\" rel=\"noopener\">Mariner 9<\/a>, obligeant la\u00a0<a href=\"https:\/\/www.nasa.gov\/\" target=\"_blank\" rel=\"noopener\">NASA\u00a0<\/a>\u00e0 retarder le travail cartographique assign\u00e9 \u00e0 la sonde.<\/p>\n<figure id=\"attachment_6276\" aria-describedby=\"caption-attachment-6276\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/08\/mars.jpg\" rel=\"lightbox[15516]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-6276\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/08\/mars-450x301.jpg\" alt=\"\" width=\"450\" height=\"301\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/08\/mars-450x301.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/08\/mars-768x513.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/08\/mars-1024x684.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/08\/mars.jpg 1350w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-6276\" class=\"wp-caption-text\">MRO a lui aussi photographi\u00e9 des traces de tourbillons de poussi\u00e8re sur Mars. \u00a9 NASA<\/figcaption><\/figure>\n<p>En plus de ces temp\u00eates spectaculaires, il existe une grande vari\u00e9t\u00e9 de vents qui fa\u00e7onnent lentement le relief de Mars. Des vents capables de nettoyer en quelques semaines la poussi\u00e8re d\u00e9pos\u00e9e sur les panneaux solaires des rovers, ou encore de dessiner de jolies arabesques sur le sol.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/02\/09\/la-planete-mars-est-de-retour-aux-cotes-de-venus-a-laube\/\" target=\"_blank\" rel=\"noopener\">La plan\u00e8te Mars est de retour aux c\u00f4t\u00e9s de V\u00e9nus \u00e0 l&#8217;aube<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/10\/14\/planete-mars-spectaculaire-image-de-la-calotte-polaire-sud\/\" target=\"_blank\" rel=\"noopener\">Plan\u00e8te Mars : spectaculaire image de la calotte polaire sud<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/10\/09\/en-images-la-beaute-des-dunes-sur-la-planete-mars\/\" target=\"_blank\" rel=\"noopener\">En images : la beaut\u00e9 des dunes sur la plan\u00e8te Mars<\/a><\/li>\n<\/ul>\n<p>Suivez l\u2019actualit\u00e9 astronomique et d\u00e9couvrez mes images du ciel en vous abonnant \u00e0 Cielmania sur\u00a0<a href=\"https:\/\/www.facebook.com\/cielmania\/\" target=\"_blank\" rel=\"noopener noreferrer\">Facebook<\/a>.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Des tourbillons de poussi\u00e8re dessinent d&#8217;\u00e9tranges motifs au milieu des dunes martiennes sous le regard de l&#8217;orbiteur europ\u00e9en TGO. Comme sur Terre : En orbite autour de la plan\u00e8te Mars depuis 2018, la sonde europ\u00e9enne Trace Gas Orbiter (TGO) a r\u00e9alis\u00e9 cette \u00e9tonnante image. Ces traces sombres qui s\u2019entortillent sur le sol ont \u00e9t\u00e9 produites &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/03\/14\/tourbillons-de-poussiere-au-milieu-des-dunes-martiennes\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Tourbillons de poussi\u00e8re au milieu des dunes martiennes<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":15517,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[116,115],"class_list":["post-15516","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-mars","tag-planete-rouge"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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