{"id":26548,"date":"2018-03-09T09:18:25","date_gmt":"2018-03-09T09:18:25","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/magnetohydrodynamic-waves-in-sheared-coronal-magnetic-structures\/"},"modified":"2018-03-09T09:18:25","modified_gmt":"2018-03-09T09:18:25","slug":"magnetohydrodynamic-waves-in-sheared-coronal-magnetic-structures","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/illes-balears\/magnetohydrodynamic-waves-in-sheared-coronal-magnetic-structures\/","title":{"rendered":"Magnetohydrodynamic waves in sheared coronal magnetic structures"},"content":{"rendered":"<h2>Tesis doctoral de <strong> I\u00f1igo Arregui Uribe Echevarria <\/strong><\/h2>\n<p>El objetivo de esta tesis ha sido contribuir al estudio te\u00f3rico de las oscilaciones en estructuras magn\u00e9ticas de la corona solar. En concreto, esta tesis aborda dos cuestiones que no han sido contempladas hasta el momento en estudios de este tipo. Por un lado se considera el hecho, bien fundamentado por las observaciones, de que estas estructuras est\u00e1n cizalladas, es decir, poseen una componente del campo magn\u00e9tico en la direcci\u00f3n a lo largo del eje de la estructura magn\u00e9tica. El trabajo comienza con la deducci\u00f3n anal\u00edtica de las ecuaciones de onda magnetohidrodin\u00e1micas (mhd) que describen perturbaciones lineales y adiab\u00e1ticas de un equilibrio bidimensional, cizallado, con invariancia longitudinal. El resultado de la derivaci\u00f3n muestra que estas ecuaciones pueden expresarse en t\u00e9rminos de dos ecuaciones diferenciales acopladas de segundo orden para las componentes de la perturbaci\u00f3n de la velocidad en las direcciones nomal y perpendicular al campo magn\u00e9tico en equilibrio. En ausencia de cizalladura y\/o propagaci\u00f3n longitud, y en la aproximaci\u00f3n de plasma frio (ausencia de gravedad y presi\u00f3n de plasma), estas ecuaciones describen modos mhd r\u00e1pidos y de alfv\u00e9n desacoplados. la inclusi\u00f3n de cizalladura y\/o propagaci\u00f3n longitudinal produce el acoplamiento de los dos tipos de modos e incrementa considerablemente la complejidad de las ecuaciones diferenciales. Por ello, las soluciones a estas ecuaciones han de hallarse mediante m\u00e9todos num\u00e9ricos. La segunda parte de la tesis se ha dedicado a la construcci\u00f3n de un programa num\u00e9rico para la resoluci\u00f3n de las citadas ecuaciones. El programa  permite obtener la frecuencia de los modos de oscilaci\u00f3n, as\u00ed como la estructura espacial bidimensional de las perturbaciones. Se ha modificado un programa existente incluyendo una malla \u00abstaggered\u00bb que permite la obtenci\u00f3n fidedigna de la estructura espacial de modos con singularidades, as\u00ed como el c\u00e1lculo de los modos normales de<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Magnetohydrodynamic waves in sheared coronal magnetic structures<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Magnetohydrodynamic waves in sheared coronal magnetic structures <\/li>\n<li><strong>Autor:<\/strong>\u00a0 I\u00f1igo Arregui Uribe Echevarria <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Illes balears<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 29\/10\/2003<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li> Ballester Mortes Jos\u00e9 Luis<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: blas Sanahuja parera <\/li>\n<li>marcel Goossens (vocal)<\/li>\n<li>Manuel Collados vera (vocal)<\/li>\n<li>stefaan Poedts (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de I\u00f1igo Arregui Uribe Echevarria El objetivo de esta tesis ha sido contribuir al estudio te\u00f3rico de las [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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