Now showing items 758-777 of 1243

  • Karlsen, Karl Niklas (Master thesis / Hovedoppgave, 2003)
    The thesis examines the relation between the magnetic field as measured by MDI and the continuum intensity at four different wavelengths (1319, 1199, 1037 and 910Å) as measured by SUMER. A method for copointing the instruments ...
  • Bergemann, Maria; Gallagher, Andrew J.; Eitner, Philipp; Bautista, Manuel; Collet, Remo; Yakovleva, Svetlana A.; Mayriedl, Anja; Plez, Bertrand; Carlsson, Mats; Leenaarts, Jorrit; Belyaev, Andrey K.; Hansen, Camilla (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Manganese (Mn) is a key Fe-group element, commonly employed in stellar population and nucleosynthesis studies to explore the role of SN Ia. We have developed a new non-local thermodynamic equilibrium (NLTE) model of Mn, ...
  • Gallagher, Andrew J.; Bergemann, Maria; Collet, Remo; Plez, Bertrand; Leenaarts, Jorrit; Carlsson, Mats Per-Olof; Yakovleva, Svetlana A.; Belyaev, Andrey K. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Context. The pursuit of more realistic spectroscopic modelling and consistent abundances has led us to begin a new series of papers designed to improve current solar and stellar abundances of various atomic species. To ...
  • De Pontieu, Bart Walter; De Moortel, I.; Martinez-Sykora, Juan; McIntosh, S. W. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    Spicules have been proposed as significant contributors to the mass and energy balance of the corona. While previous observations have provided a glimpse of short-lived transient brightenings in the corona that are associated ...
  • Gómez, Juan Camilo Guevara (Doctoral thesis / Doktoravhandling, 2022)
    The Sun's chromosphere, which is the atmospheric layer located between the solar surface (photosphere) and the solar corona, holds the key to comprehend why the corona is thousands of times hotter than the Sun's surface. ...
  • Martínez Oliveros, Juan Carlos; Guevara Gomez, Juan Camilo; Saint-Hilaire, Pascal; Hudson, Hugh; Krucker, Säm (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    We describe observations of the white-light structures in the low corona following the X8.2 flare SOL 2017-09-10, as observed in full Stokes parameters by the Helioseismic and Magnetic Imager (HMI) of the Solar Dynamics ...
  • Schmit, D.; Bryans, P.; De Pontieu, Bart Walter; McIntosh, Scott; Leenaarts, Jorrit; Carlsson, Mats (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    The Mg ii h&k doublet are two of the primary spectral lines observed by the Sun-pointing Interface Region Imaging Spectrograph (IRIS). These lines are tracers of the magnetic and thermal environment that spans from the ...
  • Scullion, Eamon; Engvold, Oddbjørn; Lin, Yong; Rouppe, Van Der Voort Luc (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    High resolution observations from the Swedish 1-m Solar Telescope revealed bright, discrete, blob-like structures (which we refer to as solar bullets) in the Hα 656.28 nm line core that appear to propagate laterally across ...
  • Thommesen, Harald (Doctoral thesis / Doktoravhandling, 2019)
    The study of the Cosmic Microwave Background (CMB) is a cornerstone of modern cosmology and allows us to explore the history of the Universe. Both the temperature and the polarization of the CMB field carry vital information ...
  • White, S. M.; Iwai, K.; Phillips, N. M.; Hills, R. E.; Hirota, A.; Yagoubov, P.; Siringo, G.; Shimojo, M.; Bastian, T. S.; Hales, A. S.; Sawada, T.; Asayama, S.; Sugimoto, M.; Marson, R. G.; Kawasaki, W.; Muller, E.; Nakazato, T.; Sugimoto, K.; Brajša, Roman; Skokic, I.; Barta, M.; Kim, S.; Remijan, A.; de Gregorio, I.; Corder, S. A.; Hudson, H. S.; Loukitcheva, M.; Chen, B.; De Pontieu, Bart Walter; Fleishmann, G. D.; Gary, D. E.; Kobelski, A.; Wedemeyer, Sven; Yan, Y. (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2017)
    This is a post-peer-review, pre-copyedit version of an article published in Solar Physics. The final authenticated version is available online at: http://dx.doi.org/10.1007/s11207-017-1123-2
  • Shimojo, M.; Bastian, T. S.; Hales, A. S.; White, S. M.; Iwai, K.; Hills, R. E.; Hirota, A.; Phillips, N. M.; Sawada, T.; Yagoubov, P.; Siringo, G.; Asayama, S.; Sugimoto, M.; Brajša, Roman; Skokic, I.; Barta, M.; Kim, S.; de Gregorio-Monsalvo, I.; Corder, S. A.; Hudson, H. S.; Wedemeyer, Sven; Gary, D. E.; De Pontieu, Bart Walter; Loukitcheva, M.; Fleishman, G. D.; Chen, B.; Kobelski, A.; Yan, Y. (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2017)
    This is a post-peer-review, pre-copyedit version of an article published in Solar Physics. The final authenticated version is available online at: http://dx.doi.org/10.1007/s11207-017-1095-2
  • Gjerløw, Eirik (Master thesis / Masteroppgave, 2010)
    The theory of inflation gives certain predictions for the amount of primordial gravitational waves compared to the amount of density perturbations. These predictions are, in principle, verifiable through observation of the ...
  • Leenaarts, Jorrit; Carlsson, Mats; Rouppe, Van Der Voort Luc (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    Observations of the solar chromosphere in the line core of the Hα line show dark elongated structures called fibrils that show swaying motion. We performed a three-dimensional radiation-MHD simulation of a network region ...
  • Hipólito-Ricaldi, William S.; vom Marttens, R.F.; Fabris, J.C.; Shapiro, I.L.; Casarini, Luciano (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    Reduced relativistic gas (RRG) is a useful approach to describe the warm dark matter (WDM) or the warmness of baryonic matter in the approximation when the interaction between the particles is irrelevant. The use of Maxwell ...
  • Færder, Øystein Håvard (Master thesis / Masteroppgave, 2012)
    The solar corona has a temperature of order 1 MK, which is almost 200 times the temperature of the underlying surface. This fact has puzzled solar physicists for more than six decades. As of today, most solar physicists ...
  • Leka, K.D.; Wagner, Eric L.; Grinon Marin, Ana Belen; Bommier, Véronique; Higgins, Richard E. L. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    The problem of bias, meaning over- or under-estimation, of the component perpendicular to the line-of-sight [B⊥] in vector magnetic-field maps is discussed. Previous works on this topic have illustrated that the problem ...
  • Drews, Ainar (Doctoral thesis / Doktoravhandling, 2021)
    Penumbral microjets (PMJs) are intriguing flashes of light found in the twilight region of sunspots, the penumbra, and they have typical lengths of hundreds of kilometres. Quite some finesse is required to tease out the ...
  • Andersen, Monica (Master thesis / Hovedoppgave, 2007)
    The goals of this thesis are to provide a general introduction to CMB fundamentals, give an overview of non-Gaussianity analysis, and to compare the sensitivities of a selection of tests (Minkowski functionals, skeleton ...
  • Asghari, Mahnaz; Beltran Jimenez, Jose; Khosravi, Shahram; Mota, David (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    We consider a cosmological model with an interaction between dark matter and dark energy which leaves the background cosmology unaffected and only affects the evolution of the perturbations. This is achieved by introducing ...
  • Skogsrud, Håkon; Rouppe, Van Der Voort Luc; De Pontieu, Bart Walter (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)
    The Interface Region Imaging Spectrograph (IRIS) provides spectroscopy and narrow band slit-jaw (SJI) imaging of the solar chromosphere and transition region at unprecedented spatial and temporal resolutions. Combined with ...