{"id":70717,"date":"2025-08-21T12:00:00","date_gmt":"2025-08-21T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/politique\/sonde-parker-confirme-theorie-de-reconnexion-magnetique"},"modified":"2025-08-23T02:43:23","modified_gmt":"2025-08-23T02:43:23","slug":"sonde-parker-confirme-theorie-de-reconnexion-magnetique","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/sonde-parker-confirme-theorie-de-reconnexion-magnetique","title":{"rendered":"Sonde Parker Confirme Th\u00e9orie de Reconnexion Magn\u00e9tique"},"content":{"rendered":"

Africa-Press – Senegal. <\/strong><\/span>Un pas de plus vers l\u2019e\u0301tablissement d\u2019une me\u0301te\u0301o solaire? Nous n\u2019en sommes pas encore la\u0300, mais une avance\u0301e significative parai\u0302t avoir e\u0301te\u0301 re\u0301alise\u0301e. Pour la premie\u0300re fois, une sonde a traverse\u0301 une re\u0301gion de reconnexion magne\u0301tique dans l\u2019atmosphe\u0300re du Soleil, confirmant des mode\u0300les the\u0301oriques e\u0301labore\u0301s depuis pre\u0300s de 70 ans. La reconnexion magne\u0301tique de\u0301signe ce phe\u0301nome\u0300ne physique ou\u0300 des lignes de champ magne\u0301tique se rompent et se reconnectent dans un plasma. Cela libe\u0300re une e\u0301nergie colossale, qui est a\u0300 l\u2019origine des e\u0301ruptions solaires et des e\u0301jections de masse coronale. Autant d\u2019e\u0301ve\u0301nements capables de perturber les satellites, les communications et me\u0302me les re\u0301seaux e\u0301lectriques terrestres.<\/p>\n

Une e\u0301ruption solaire de septembre 2022<\/b><\/p>\n

Les observations e\u0301voque\u0301es ici ont e\u0301te\u0301 permises gra\u0302ce a\u0300 la sonde Parker Solar Probe (PSP): cet engin de la NASA est l\u2019unique ve\u0301hicule spatial a\u0300 s\u2019e\u0302tre aventure\u0301 dans la haute atmosphe\u0300re solaire. En septembre 2022, PSP a fro\u0302le\u0301 notre e\u0301toile et traverse\u0301 une gigantesque e\u0301ruption. Gra\u0302ce a\u0300 ses instruments embarque\u0301s et a\u0300 des observations comple\u0301mentaires de Solar Orbiter, la mission europe\u0301enne, les chercheurs du Southwest Research Institute (SwRI ; Texas, Etats-Unis) ont pu analyser en de\u0301tail le plasma et les champs magne\u0301tiques dans cette zone de reconnexion.<\/p>\n

\u00ab Les mesures de PSP ont valide\u0301 des mode\u0300les nume\u0301riques existant depuis des de\u0301cennies, explique dans un communique\u0301 de presse du SwRI le Dr Ritesh Patel, auteur principal de l\u2019e\u0301tude publie\u0301e dans Nature Astronomy. Elles offrent de\u0301sormais des contraintes solides pour affiner les futures simulations et mieux interpre\u0301ter les donne\u0301es solaires \u00bb. Jusqu\u2019ici, la reconnexion avait de\u0301ja\u0300 e\u0301te\u0301 observe\u0301e indirectement (dans la couronne solaire et dans la magne\u0301tosphe\u0300re terrestre) gra\u0302ce a\u0300 d\u2019autres missions scientifiques. Mais jamais un instrument n\u2019avait directement traverse\u0301 une telle re\u0301gion dans l\u2019atmosphe\u0300re solaire.<\/p>\n

\u00ab Pre\u0301voir l\u2019activite\u0301 solaire et ses impacts \u00bb<\/b><\/p>\n

Cette observation comble ainsi une sorte de chai\u0302non manquant entre l\u2019e\u0301chelle terrestre et l\u2019e\u0301chelle solaire. De\u0301sormais, l\u2019enjeu est de de\u0301terminer si ces me\u0301canismes s\u2019accompagnent de turbulences, d\u2019ondes ou de fluctuations du champ magne\u0301tique. \u00ab Comprendre comment l\u2019e\u0301nergie est transfe\u0301re\u0301e et comment les particules sont acce\u0301le\u0301re\u0301es nous aidera a\u0300 pre\u0301voir l\u2019activite\u0301 solaire et ses impacts \u00bb, souligne le Dr Patel. De quoi nourrir l\u2019espoir, a\u0300 terme, d\u2019un ve\u0301ritable service de pre\u0301vision de la me\u0301te\u0301o solaire, un enjeu crucial pour prote\u0301ger nos technologies face aux ale\u0301as de l\u2019espace.<\/p>\n

Pour plus d’informations et d’analyses sur la Senegal<\/span>, suivez Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – Senegal. Un pas de plus vers l\u2019e\u0301tablissement d\u2019une me\u0301te\u0301o solaire? Nous n\u2019en sommes pas encore la\u0300, mais une avance\u0301e significative parai\u0302t avoir e\u0301te\u0301 re\u0301alise\u0301e. Pour la premie\u0300re fois, une sonde a traverse\u0301 une re\u0301gion de reconnexion magne\u0301tique dans l\u2019atmosphe\u0300re du Soleil, confirmant des mode\u0300les the\u0301oriques e\u0301labore\u0301s depuis pre\u0300s de 70 ans. La reconnexion […]<\/p>\n","protected":false},"author":82,"featured_media":70716,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[44],"class_list":["post-70717","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-senegal-2"],"yoast_head":"\nSonde Parker Confirme Th\u00e9orie de Reconnexion Magn\u00e9tique - Senegal<\/title>\n<meta name=\"description\" content=\"Un pas de plus vers l\u2019e\u0301tablissement d\u2019une me\u0301te\u0301o solaire? 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