dc.date.accessioned | 2021-10-01T10:46:04Z | |
dc.date.available | 2021-10-01T10:46:04Z | |
dc.date.issued | 2021 | |
dc.identifier.uri | http://hdl.handle.net/10852/88694 | |
dc.description.abstract | The Sun is dynamic and influences the surrounding planetary system which becomes increasingly imperative to be able to predict as we increase the technology and space exploration. To this end, it is important to understand the transport of energy and the dynamical processes that take place in the solar atmosphere. Radiation at millimeter wavelengths which mainly forms in the mid-layers of the solar atmosphere, the Chromosphere, is a powerful indicator of the temperature of the plasma.
To achieve high sensitivity and resolution, interferometric observations are performed with the Atacama Large Millimeter/sub-millimeter Array (ALMA), which consist of about 66 radio antennas. Many challenges come with interferometric observations of the Sun and the data needs to be carefully handled to reconstruct reliable high frame-rate time-series of images. In the observations, several hundred small-scale dynamic brightening events are detected and their evolution is tracked through time. The origin and physical properties of the brightening events are determined by comparison of their characteristics to state-of-the-art three-dimensional numerical simulations. The accurate temperature measurements of the brightening events provides one step further to understanding the energy transport in the solar atmosphere. | en_US |
dc.language.iso | en | en_US |
dc.relation.haspart | Paper I: Eklund, H.; Wedemeyer, S.; Szydlarski, M.; Jafarzadeh, S. and Guevara Gómez, J. C. “The Sun at millimeter wavelengths II. Small-scale dynamic events in ALMA Band 3”. In: Astronomy & Astrophysics. Vol. 644, no. 152 (2020). DOI: 10.1051/0004-6361/202038250. The article is included in the thesis. Also available at: https://doi.org/10.1051/0004-6361/202038250 | |
dc.relation.haspart | Paper II: Eklund, H.; Wedemeyer, S.; Snow, B.; Jess, D. B.; Jafarzadeh, S.; Grant, S. D. T.; Carlsson, M. and Szydlarski, M. “Characterisation of shock wave signatures at millimetre wavelengths from Bifrost simulations”. In: Philosophical Transactions of the Royal Society A. Vol. 379, no. 20200185 (2021). DOI: 10.1098/rsta.2020.0185 . The article is included in the thesis. Also available at: https://doi.org/10.1098/rsta.2020.0185 | |
dc.relation.haspart | Paper III: Eklund, H.; Wedemeyer, S.; Szydlarski, M. and Jafarzadeh, S. “The Sun at millimeter wavelengths III. Impact of the spatial resolution on solar ALMA observations”. Submitted for publication in Astronomy & Astrophysics. To be published. The paper is not available in DUO awaiting publishing. | |
dc.relation.uri | https://doi.org/10.1051/0004-6361/202038250 | |
dc.relation.uri | https://doi.org/10.1098/rsta.2020.0185 | |
dc.title | Investigating dynamic small-scale events in the Sun with the Atacama Large Millimeter/sub-millimeter Array | en_US |
dc.type | Doctoral thesis | en_US |
dc.creator.author | Eklund, Henrik | |
dc.identifier.urn | URN:NBN:no-91311 | |
dc.type.document | Doktoravhandling | en_US |
dc.identifier.fulltext | Fulltext https://www.duo.uio.no/bitstream/handle/10852/88694/1/PhD-Eklund-2021.pdf | |