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dc.contributor.advisorEspy, Patrick Josephnb_NO
dc.contributor.authorNærø, Karolinenb_NO
dc.date.accessioned2014-12-19T13:18:27Z
dc.date.available2014-12-19T13:18:27Z
dc.date.created2013-08-29nb_NO
dc.date.issued2013nb_NO
dc.identifier644224nb_NO
dc.identifierntnudaim:9904nb_NO
dc.identifier.urihttp://hdl.handle.net/11250/246945
dc.description.abstractThis thesis presents two methods of finding the sources of gravity waves observed in the night-time hydroxyl airglow; ray-tracing and geometric localisation by fitting concentric circles onto the curvature of the gravity waves' fronts. The observations were made at Dragvoll, Trondheim during winter season of 2012/2013 using an all-sky camera system with a 45$^\circ$ field of view. Wintertime in Trondheim has proved to be a good place to study gravity waves by OH nightglow imaging. Nearly every clear night, the images that were taken captured evidence of gravity wave activity. This thesis explores the probable sources of the gravity waves. Possible gravity wave sources in the Trondheim area include weather fronts coming in from the western coast, airflow over the Norwegian mountain ridge and auroral activity. Most of the waves were found to propagate from sources in the mountainous inland region of Norway. Given their locations, it is highly likely that these waves are caused by topographic launching. Simply put, topographic launching is airflow over mountains generating waves that propagate freely away from the source region. This is made even more likely by ruling out other possible sources. There is little convective activity in wintertime Norway, making thunderstorms an unlikely source. The fact that the waves propagated from sources near the tropopause rules out auroral activity as the cause of the observed waves.nb_NO
dc.languageengnb_NO
dc.publisherInstitutt for fysikknb_NO
dc.titleGravity Wave Refraction in the Atmosphere:: Ray tracing versus Geometric Location from a Single Imagenb_NO
dc.typeMaster thesisnb_NO
dc.source.pagenumber74nb_NO
dc.contributor.departmentNorges teknisk-naturvitenskapelige universitet, Fakultet for naturvitenskap og teknologi, Institutt for fysikknb_NO


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