{"id":5296,"date":"2026-10-14T14:15:09","date_gmt":"2026-10-14T17:15:09","guid":{"rendered":"https:\/\/iate.oac.uncor.edu\/?p=5296"},"modified":"2026-10-14T14:15:09","modified_gmt":"2026-10-14T17:15:09","slug":"viernes-16-10-from-waves-to-discontinuities-a-unified-mhd-framework-in-q-variables","status":"publish","type":"post","link":"https:\/\/iate.oac.uncor.edu\/en\/2026\/10\/14\/viernes-16-10-from-waves-to-discontinuities-a-unified-mhd-framework-in-q-variables\/","title":{"rendered":"Viernes 16\/10: From waves to discontinuities: A unified MHD framework in Q-Variables"},"content":{"rendered":"<p style=\"text-align: justify;\"><span style=\"font-size: 12pt;\"><strong>Expositor:<\/strong> Anna Krupka (Centre for mathematical Plasma Astrophysics, Department of Mathematics, Katholic University of Leuven)<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-size: 12pt;\"><strong>Date:<\/strong> viernes 16 de octubre, 11:30 hs.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-size: 12pt;\"><strong>Abstract:<\/strong> Magnetohydrodynamic waves and discontinuities are usually treated as distinct problems: waves are described in terms of propagating modes, while shocks and other discontinuities are characterised by jump conditions between two plasma states. A wave-aligned formulation based on Q-variables describes both within the same framework.<\/span><br \/>\n<span style=\"font-size: 12pt;\">Q-variables describe plasma in terms of waves by combining velocity and magnetic field into a single variable. They can decompose plasma into MHD waves and their propagation directions. The classical Rankine-Hugoniot conditions derived in Q-variables reveal the wave structure contained in the jump relations while remaining fully equivalent to the standard MHD description.<\/span><br \/>\n<span style=\"font-size: 12pt;\">This formulation also provides a natural basis for classifying ideal-MHD discontinuities. Contact, tangential and rotational discontinuities, as well as different shock families, show characteristic signatures in Q-space that can be expressed through relations between wave-aligned variables on either side of the discontinuity.<\/span><br \/>\n<span style=\"font-size: 12pt;\">These analytical results can then be extended into a diagnostic framework by mapping Q-variables across discontinuities and using the resulting relations to identify the structure in numerical simulations and, ultimately, plasma observations. The broader goal is to develop a common language in which MHD waves, their propagation directions and the discontinuities connecting different plasma states can all be analysed within the same formalism.<\/span><\/p>","protected":false},"excerpt":{"rendered":"<p>Expositora: Anna Krupka (Centre for mathematical Plasma Astrophysics, Department of Mathematics, Katholic University of Leuven) Fecha: viernes 16 de octubre, 11:30 hs. Resumen: Magnetohydrodynamic waves and discontinuities are usually treated as distinct problems: waves are described in terms of propagating modes, while shocks and other discontinuities are characterised by jump&hellip;<\/p>","protected":false},"author":1,"featured_media":5297,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,9],"tags":[],"class_list":["post-5296","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novedades","category-seminarios"],"_links":{"self":[{"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/posts\/5296","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/comments?post=5296"}],"version-history":[{"count":1,"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/posts\/5296\/revisions"}],"predecessor-version":[{"id":5298,"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/posts\/5296\/revisions\/5298"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/media\/5297"}],"wp:attachment":[{"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/media?parent=5296"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/categories?post=5296"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/iate.oac.uncor.edu\/en\/wp-json\/wp\/v2\/tags?post=5296"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}