{"id":213,"date":"2018-04-30T09:15:22","date_gmt":"2018-04-30T08:15:22","guid":{"rendered":"https:\/\/sites-lira.obspm.fr\/helisol\/?p=213"},"modified":"2018-09-11T09:55:36","modified_gmt":"2018-09-11T08:55:36","slug":"article-sur-le-role-de-lhelicite-non-potentielle-soumis","status":"publish","type":"post","link":"https:\/\/sites-lira.obspm.fr\/helisol\/2018\/04\/30\/article-sur-le-role-de-lhelicite-non-potentielle-soumis\/","title":{"rendered":"Article sur le r\u00f4le de l’h\u00e9licit\u00e9 non-potentielle soumis."},"content":{"rendered":"

Dans une pr\u00e9c\u00e9dente \u00e9tude du projet H\u00e9liSol<\/a> (Cf. article dans Astronomy & Astrophysics<\/a>), nous avions mis en avant le r\u00f4le clef que l’h\u00e9licit\u00e9 magn\u00e9tique, et en particulier une des ses composantes, l’h\u00e9licit\u00e9 magn\u00e9tique non-potentielle, pouvait avoir pour pr\u00e9dire les \u00e9ruptions solaires. Ces r\u00e9sultats viennent d’\u00eatre valid\u00e9s voir m\u00eame renforc\u00e9s par une nouvelle \u00e9tude de notre \u00e9quipe.<\/p>\n

A partir de nouvelles simulations num\u00e9riques, celles d\u00e9velopp\u00e9es par F. Zuccarello, ancien post-doctorant au LESIA dans le cadre d’une bourse du fond AXA pour la recherche<\/a>, nous avons analys\u00e9s le comportement de l’h\u00e9licit\u00e9 magn\u00e9tique. Ces simulations (publi\u00e9es dans Zuccarello et al. ApJ, 2015<\/a>) reproduisent le d\u00e9clenchement d’\u00e9ruptions solaires. Diff\u00e9rents jeux de param\u00e8tres permettent la g\u00e9n\u00e9ration d’\u00e9ruptions de diverses mani\u00e8res, \u00e0 des instants diff\u00e9rents. Zuccarello et al. ApJ, 2015<\/a> ont port\u00e9 un soin particulier \u00e0 d\u00e9terminer le moment pr\u00e9cis auquel chaque \u00e9ruption avait lieu. Ces informations temporelles cruciales nous permettent ainsi de pr\u00e9cis\u00e9ment mesurer les propri\u00e9t\u00e9s de l’h\u00e9licit\u00e9 \u00e0 l’instant m\u00eame du d\u00e9clenchement des \u00e9ruptions solaires<\/p>\n

Nous avons ainsi confirm\u00e9 nos observations pr\u00e9c\u00e9dente que l’h\u00e9licit\u00e9 magn\u00e9tique semblait jouer un r\u00f4le clef pour d\u00e9crire la stabilit\u00e9 du syst\u00e8me magn\u00e9tique. En effet, contrairement \u00e0 toutes les autres quantit\u00e9s observ\u00e9es, nous avons constat\u00e9s que le rapport de l’h\u00e9licit\u00e9 magn\u00e9tique non potentielle \u00e0 l’h\u00e9licit\u00e9 magn\u00e9tique totale, avait la m\u00eame valeur dans toutes les simulations au moment du d\u00e9clenchement de l’\u00e9ruption. Il semblerait qu’il existe un seuil critique de ce ratio au del\u00e0 duquel une syst\u00e8me magn\u00e9tique de type solaire devient instable et une \u00e9ruption solaire est induite.<\/p>\n

\u201cThreshold of non-potential magnetic helicity ratios at the onset of solar eruptions<\/em><\/a>\u201c; F. Zuccarello, E. Pariat, G. Valori, L. Linan<\/strong>, The Astrophysical Journal, soumis<\/p>\n

Ces travaux sont donc particuli\u00e8rement marquant. L\u2019h\u00e9licit\u00e9 magn\u00e9tique semble marquer clairement l\u2019\u00e9ruptivit\u00e9 des r\u00e9gions actives solaires.Ce r\u00e9sultat est d\u00e9sormais confirm\u00e9 sur plus d’une quinzaines de simulations num\u00e9riques MHD, obtenus avec 3 codes num\u00e9riques diff\u00e9rents, dans quatres mod\u00e8les physique distinct. Il reste maintenant confirmer ce r\u00e9sultats \u00e0 partir de v\u00e9ritable donn\u00e9es d\u2019observations.<\/p>\n","protected":false},"excerpt":{"rendered":"

Dans une pr\u00e9c\u00e9dente \u00e9tude du projet H\u00e9liSol (Cf. article dans Astronomy & Astrophysics), nous avions mis en avant le r\u00f4le clef que l’h\u00e9licit\u00e9 magn\u00e9tique, et en particulier une des ses composantes, l’h\u00e9licit\u00e9 magn\u00e9tique non-potentielle, pouvait avoir pour pr\u00e9dire les \u00e9ruptions … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":18,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-213","post","type-post","status-publish","format-standard","hentry","category-articles"],"yoast_head":"\nArticle sur le r\u00f4le de l'h\u00e9licit\u00e9 non-potentielle soumis. - HeliSol<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/sites-lira.obspm.fr\/helisol\/2018\/04\/30\/article-sur-le-role-de-lhelicite-non-potentielle-soumis\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Article sur le r\u00f4le de l'h\u00e9licit\u00e9 non-potentielle soumis. - HeliSol\" \/>\n<meta property=\"og:description\" content=\"Dans une pr\u00e9c\u00e9dente \u00e9tude du projet H\u00e9liSol (Cf. article dans Astronomy & Astrophysics), nous avions mis en avant le r\u00f4le clef que l’h\u00e9licit\u00e9 magn\u00e9tique, et en particulier une des ses composantes, l’h\u00e9licit\u00e9 magn\u00e9tique non-potentielle, pouvait avoir pour pr\u00e9dire les \u00e9ruptions … Continue reading →\" \/>\n<meta property=\"og:url\" content=\"https:\/\/sites-lira.obspm.fr\/helisol\/2018\/04\/30\/article-sur-le-role-de-lhelicite-non-potentielle-soumis\/\" \/>\n<meta property=\"og:site_name\" content=\"HeliSol\" \/>\n<meta property=\"article:published_time\" content=\"2018-04-30T08:15:22+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2018-09-11T08:55:36+00:00\" \/>\n<meta name=\"author\" content=\"Etienne Pariat\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Etienne Pariat\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/sites-lira.obspm.fr\\\/helisol\\\/2018\\\/04\\\/30\\\/article-sur-le-role-de-lhelicite-non-potentielle-soumis\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/sites-lira.obspm.fr\\\/helisol\\\/2018\\\/04\\\/30\\\/article-sur-le-role-de-lhelicite-non-potentielle-soumis\\\/\"},\"author\":{\"name\":\"Etienne Pariat\",\"@id\":\"https:\\\/\\\/sites-lira.obspm.fr\\\/helisol\\\/#\\\/schema\\\/person\\\/bc8b11e0456f0bbebd20b642197d941e\"},\"headline\":\"Article sur le r\u00f4le de l’h\u00e9licit\u00e9 non-potentielle soumis.\",\"datePublished\":\"2018-04-30T08:15:22+00:00\",\"dateModified\":\"2018-09-11T08:55:36+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/sites-lira.obspm.fr\\\/helisol\\\/2018\\\/04\\\/30\\\/article-sur-le-role-de-lhelicite-non-potentielle-soumis\\\/\"},\"wordCount\":412,\"articleSection\":[\"Articles\"],\"inLanguage\":\"fr-FR\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/sites-lira.obspm.fr\\\/helisol\\\/2018\\\/04\\\/30\\\/article-sur-le-role-de-lhelicite-non-potentielle-soumis\\\/\",\"url\":\"https:\\\/\\\/sites-lira.obspm.fr\\\/helisol\\\/2018\\\/04\\\/30\\\/article-sur-le-role-de-lhelicite-non-potentielle-soumis\\\/\",\"name\":\"Article sur le r\u00f4le de l'h\u00e9licit\u00e9 non-potentielle soumis. - 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