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dc.contributor.authorParmer, Asbjørn Lie
dc.date.accessioned2020-12-16T23:46:21Z
dc.date.available2020-12-16T23:46:21Z
dc.date.issued2014
dc.identifier.citationParmer, Asbjørn Lie. Imaging the Solar Chromosphere with the Atacama Large Millimeter/submillimeter Array. Master thesis, University of Oslo, 2014
dc.identifier.urihttp://hdl.handle.net/10852/81671
dc.description.abstractThe chromosphere is nearly translucent in the optical and infrared continuum, making it an elusive observational target. In this thesis, I use a CO5BOLD computational 3D radiation magnetohydrodynamics (MHD) model of the solar atmosphere to investigate what the chromosphere might look like with the newly built Atacama Large Millimeter/submillimeter Array (ALMA). The radiative transfer solver LINFOR3D is used to produce synthetic brightness temperature maps of the MHD model at several wavelengths in the (sub-)mm range, and the maps are analyzed and compared with the MHD model to discern the relation between observing wavelength and the formation height of the radiation. The software package CASA is then used to simulate interferometric ALMA observations of the brightness temperature maps. We investigate the capabilities of the method \textsc{clean} to produce images from the simulated ALMA observations. The radiative transfer calulations on the MHD model indicate that possible probing depth of ALMA observations extend from the upper photosphere at the wavelength 0.3 mm, to the middle chromosphere at lambda=8.6 mm. The ALMA observations resolves the chromospheric structure to an extent that facilitates imaging with a spatial resolution of up to 0.3 arcseconds 1 mm. This is close to the resolution of current optical telescopes, and may result in revolutionizing new data about the chromosphere.eng
dc.language.isoeng
dc.subjectThe
dc.subjectSun
dc.subjectchromosphere
dc.subjectALMA
dc.subjectsola
dc.subjectkromosfæren
dc.subjectinterferometri
dc.subjectinterferometry
dc.titleImaging the Solar Chromosphere with the Atacama Large Millimeter/submillimeter Arrayeng
dc.typeMaster thesis
dc.date.updated2020-12-16T23:46:20Z
dc.creator.authorParmer, Asbjørn Lie
dc.identifier.urnURN:NBN:no-84722
dc.type.documentMasteroppgave
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/81671/1/Thesis.pdf


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