{"id":73057,"date":"2025-11-30T12:00:00","date_gmt":"2025-11-30T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/politique\/premieres-images-du-pole-sud-du-soleil-revelent-mysteres"},"modified":"2025-11-30T17:26:34","modified_gmt":"2025-11-30T17:26:34","slug":"premieres-images-du-pole-sud-du-soleil-revelent-mysteres","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/premieres-images-du-pole-sud-du-soleil-revelent-mysteres","title":{"rendered":"Premi\u00e8res Images du P\u00f4le Sud du Soleil R\u00e9v\u00e8lent Myst\u00e8res"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Senegal. <\/strong><\/span>Au printemps 2024, la sonde Solar Orbiter de l\u2019Agence spatiale europe\u0301enne (ESA) re\u0301alisait un exploit. Aucun observatoire terrestre ou spatial n\u2019avait pu contempler, jusqu\u2019ici, les plus hautes latitudes de notre e\u0301toile. Mais l\u2019engin de 1800 kg conc\u0327u par Airbus Defense and Space photographiait alors le po\u0302le sud du Soleil, obtenant ainsi \u00ab les premie\u0300res images d\u2019un po\u0302le solaire jamais re\u0301alise\u0301es par l\u2019humanite\u0301 \u00bb, se fe\u0301licitait l\u2019astrophysicienne britannique Carole Mundell, directrice de la science a\u0300 l\u2019ESA.<\/p>\n<p>Les premie\u0300res analyses viennent d\u2019e\u0302tre publie\u0301es dans la revue The Astrophysical Journal Letters. Elles de\u0301voilent des re\u0301sultats totalement inattendus sur les proprie\u0301te\u0301s du champ magne\u0301tique au niveau des po\u0302les, qui sont elles-me\u0302mes essentielles \u00ab pour mieux comprendre les cycles d\u2019activite\u0301 de notre e\u0301toile \u00bb, soulignent les auteurs de l\u2019e\u0301tude.<\/p>\n<p><b>Plasma de particules charge\u0301es<\/b><\/p>\n<p>Tel est l\u2019un des objectifs affiche\u0301s de la mission Solar Orbiter lance\u0301e en 2020 pour un cou\u0302t total de 1,5 milliard d\u2019euros: observer les phe\u0301nome\u0300nes a\u0300 l\u2019\u0153uvre aux latitudes supe\u0301rieures a\u0300 60\u00b0 afin d\u2019avoir une meilleure compre\u0301hension du champ magne\u0301tique du Soleil, et ce faisant des variations de son activite\u0301 (taches solaires, e\u0301ruptions, e\u0301missions de particules e\u0301nerge\u0301tiques pouvant affecter les infrastructures terrestres&#8230;) sur des pe\u0301riodes d\u2019environ onze ans.<\/p>\n<p>Car l\u2019activite\u0301 du Soleil est re\u0301gie essentiellement par son champ magne\u0301tique. L\u2019astre du jour est constitue\u0301 en effet d\u2019un plasma de particules e\u0301lectriquement charge\u0301es (protons et e\u0301lectrons) qui, en s\u2019agitant dans les profondeurs de l\u2019astre, cre\u0301ent des lignes de champ magne\u0301tique.<\/p>\n<p><b>Boucles magne\u0301tiques<\/b><\/p>\n<p>En pe\u0301riode calme, celles-ci sont bien organise\u0301es, comme autour d\u2019un aimant: elles vont d\u2019une re\u0301gion polaire a\u0300 une autre ou\u0300 se situent les po\u0302les magne\u0301tiques nord et sud. Mais en raison de la structure en couche du Soleil et de sa rotation, les lignes se distordent peu a\u0300 peu.<\/p>\n<p>Elles finissent par former des boucles qui percent la surface du Soleil, engendrant ainsi les fameuses taches sombres. Or ces boucles peuvent \u00ab craquer \u00bb lorsqu\u2019elles sont trop pleines. Elles produisent alors des flash lumineux de haute e\u0301nergie (rayons X, UV, etc.), des particules tre\u0300s e\u0301nerge\u0301tiques et parfois aussi d\u2019immenses jets de matie\u0300re appele\u0301s \u00ab e\u0301jections de masse coronale \u00bb pouvant atteindre la Terre au bout de quelques jours de voyage.<\/p>\n<p><b>Assistance gravitationnelle de Ve\u0301nus<\/b><\/p>\n<p>\u00ab Pour expliquer les cycles magne\u0301tiques du Soleil, il nous manquait encore la connaissance de ce qui se passe dans les re\u0301gions polaires. Et Solar Orbiter apporte la pie\u0300ce manquante du puzzle \u00bb, se re\u0301jouit l\u2019astronome Sami Solanki, directeur de l\u2019institut allemand Max-Planck pour les recherches sur le Syste\u0300me solaire et coauteur des analyses sur les images du po\u0302le sud.<\/p>\n<p>Pour acce\u0301der a\u0300 ce qu\u2019aucune sonde spatiale n\u2019a pu visualiser avant elle, la sonde europe\u0301enne a effectue\u0301 une se\u0301rie de man\u0153uvres d\u2019assistance gravitationnelle en passant a\u0300 proximite\u0301 de Ve\u0301nus. Son orbite s\u2019est incline\u0301e ainsi peu a\u0300 peu par rapport au plan e\u0301quatorial du Soleil, jusqu\u2019a\u0300 atteindre en mars 2025 un angle de 17\u00b0. De quoi re\u0301aliser, huit jours durant, gra\u0302ce aux instruments PHI (Polarimetric and Helioseismic Imager) et EUI (Extreme Ultraviolet Imager) de Solar Orbiter, des photographies ine\u0301dites du po\u0302le sud a\u0300 quelque 40 millions de kilome\u0300tres de notre e\u0301toile (soit environ un quart de la distance Terre-Soleil).<\/p>\n<p><b>Traceurs naturels<\/b><\/p>\n<p>Depuis cette position ine\u0301dite, Solar Orbiter a observe\u0301 les \u00ab supergranules \u00bb qui se forment sur la surface de l\u2019e\u0301toile: de gigantesques cellules de convection deux a\u0300 trois fois plus larges que le diame\u0300tre de la Terre ou\u0300 le plasma bouillonnant monte dans les parties centrales, puis s\u2019e\u0301coule horizontalement avant de redescendre dans les profondeurs au niveau des bords.<\/p>\n<p>Or en mettant en mouvement le plasma, ces structures de\u0301placent aussi le champ magne\u0301tique qu\u2019elles organisent ainsi a\u0300 la surface du Soleil. \u00ab Les supergranules des po\u0302les agissent comme des traceurs naturels, indique Lakshmi Pradeep Chitta, lui aussi chercheur a\u0300 l\u2019institut Max-Planck. Elles rendent visible, pour la premie\u0300re fois, la composante polaire de la circulation globale du Soleil dans ses cycles de onze ans. \u00bb<\/p>\n<p><b>Vitesse de de\u0301placement<\/b><\/p>\n<p>L\u2019e\u0301quipe allemande a pu mesurer ainsi, de fac\u0327on tre\u0300s pre\u0301cise, la vitesse de de\u0301placement des supergranules en direction du po\u0302le sud. Or celle-ci est comprise entre 10 et 20 me\u0300tres par secondes selon les structures e\u0301tudie\u0301es. Soit une vitesse presque aussi importante que ce qui est observe\u0301 a\u0300 l\u2019e\u0301quateur&#8230; et qui est bien plus rapide que ce que tous les mode\u0300les the\u0301oriques pre\u0301voyaient !<\/p>\n<p>Ces mesures, qui seront incorpore\u0301s dans les futures mode\u0301lisations, permettront de mieux comprendre et pre\u0301dire l\u2019e\u0301volution du champ magne\u0301tique et par conse\u0301quent les humeurs de notre e\u0301toile. Sans compter que d\u2019ici a\u0300 la fin des anne\u0301es 2020, Solar Orbiter inclinera encore plus son orbite, jusqu\u2019a\u0300 30 voire 33\u00b0, ce qui permettra d\u2019obtenir des images encore plus pre\u0301cises des po\u0302les magne\u0301tiques du Soleil.<\/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. Au printemps 2024, la sonde Solar Orbiter de l\u2019Agence spatiale europe\u0301enne (ESA) re\u0301alisait un exploit. Aucun observatoire terrestre ou spatial n\u2019avait pu contempler, jusqu\u2019ici, les plus hautes latitudes de notre e\u0301toile. Mais l\u2019engin de 1800 kg conc\u0327u par Airbus Defense and Space photographiait alors le po\u0302le sud du Soleil, obtenant ainsi \u00ab [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":73056,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[44],"class_list":["post-73057","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>Premi\u00e8res Images du P\u00f4le Sud du Soleil R\u00e9v\u00e8lent Myst\u00e8res - Senegal<\/title>\n<meta name=\"description\" content=\"Au printemps 2024, la sonde Solar Orbiter de l\u2019Agence spatiale europe\u0301enne (ESA) re\u0301alisait un exploit. Aucun observatoi ...\" \/>\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\/premieres-images-du-pole-sud-du-soleil-revelent-mysteres\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Premi\u00e8res Images du P\u00f4le Sud du Soleil R\u00e9v\u00e8lent Myst\u00e8res\" \/>\n<meta property=\"og:description\" content=\"Au printemps 2024, la sonde Solar Orbiter de l\u2019Agence spatiale europe\u0301enne (ESA) re\u0301alisait un exploit. 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