Now showing items 547-566 of 1243

  • Engvold, Oddbjørn (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2018)
    The IAU promotes astronomy as a tool to strengthen science education of young people in developing regions through its International Schools for Young Astronomers (ISYA) and a Teaching for Astronomy Development (TAD) ...
  • Kanella, Charalambos; Gudiksen, Boris Vilhelm (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    Context. The solar coronal heating problem has been an open question in the science community since 1939. One of the proposed models for the transport and release of mechanical energy generated in the sub-photospheric ...
  • Zaborowski, E.A.; Drlica-Wagner, A.; Ashmead, F.; Wu, J.F.; Morgan, R.; Bom, C.R.; Shajib, A.J.; Birrer, S.; Cerny, W.; Buckley-Geer, E.J.; Mutlu-Pakdil, B.; Ferguson, P.S.; Glazebrook, K.; Gonzalez Lozano, S. J.; Gordon, Y.; Martinez, M.; Manwadkar, V.; O'Donnell, J.; Poh, J.; Riley, A.; Sakowska, J.D.; Santana-Silva, L.; Santiago, B.X.; Sluse, D.; Tan, C.Y.; Tollerud, E.J.; Verma, A.; Carballo-Bello, J.A.; Choi, Y.; James, D.J.; Kuropatkin, N.; Martinez-Vazquez, C.E.; Nidever, D.L.; Nilo Castellon, J. L.; Noël, N.E.D.; Olsen, K.A.G.; Pace, A.B.; Mau, S.; Yanny, B.; Zenteno, A.; Abbott, T.M.C.; Aguena, M.; Alves, O.; Andrade-Oliveira, F.; Bocquet, S.; Brooks, D.; Burke, D.L.; Carnero Rosell, A.; Carrasco Kind, M.; Carretero, J.; Castander, F.J.; Conselice, C.J.; Costanzi, M.; Pereira, M.E.S.; De Vicente, J.; Desai, S.; Dietrich, J.P.; Doel, P.; Everett, S.; Ferrero, Ismael; Flaugher, B.; Friedel, D.; Frieman, J.; Garcia-Bellido, J.; Gruen, D.; Gruendl, R.A.; Gutierrez, G.; Hinton, S.R.; Hollowood, D.L.; Honscheid, K.; Kuehn, K.; Lin, H.; Marshall, J.L.; Melchior, P.; Mena-Fernandez, J.; Menanteau, F.; Miquel, R.; Palmese, A.; Paz-Chinchon, F.; Pieres, A.; Plazas Malagon, A. A.; Prat, J.; Rodriguez-Monroy, M.; Romer, A.K.; Sanchez, E.; Scarpine, V.; Sevilla-Noarbe, I.; Smith, M.; Suchyta, E.; To, C.; Weaverdyck, N. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Abstract We perform a search for galaxy–galaxy strong lens systems using a convolutional neural network (CNN) applied to imaging data from the first public data release of the DECam Local Volume Exploration Survey, ...
  • Vanzella, E.; Balestra, I.; Gronke, Max Balthasar; Karman, W.; Caminha, G. B.; Dijkstra, Mark; Rosati, P.; De Barros, S.; Caputi, K.; Grillo, C.; Tozzi, P.; Meneghetti, M.; Mercurio, A.; Gilli, R. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    We report the identification of extended Lyα nebulae at z ≃ 3.3 in the Hubble Ultra Deep Field (HUDF, ≃40 kpc × 80 kpc) and behind the Hubble Frontier Field galaxy cluster MACSJ0416 (≃40 kpc), spatially associated with ...
  • Huang, Ziwen; Teriaca, L.; Cuadrado, R. Aznar; Chitta, L.P.; Mandal, S.; Peter, H.; Schühle, U.; Solanki, S.K.; Auchère, F.; Berghmans, D.; Buchlin, E.; Carlsson, Mats; Fludra, A.; Fredvik, Terje; Giunta, A.; Grundy, T.; Hassler, D.; Parenti, S.; Plaschke, F. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Context. The smallest extreme-ultraviolet (EUV) brightening events that were detected so far, called campfires, have recently been uncovered by the High Resolution EUV telescope (HRI EUV ), which is part of the Extreme ...
  • Parmer, Asbjørn Lie (Master thesis / Masteroppgave, 2014)
    The 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 ...
  • Klevas, J.; Kučinskas, A.; Wedemeyer, Sven; Ludwig, H.-G. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    We use 3D magnetohydrodynamic CO5BOLD model atmospheres to study the interplay between magnetic fields and convection in the atmospheres of red giant stars. We find that vortex-like structures occur prominently in stars ...
  • Bakke, Helle (Doctoral thesis / Doktoravhandling, 2023)
    Understanding the mechanisms responsible for heating the solar atmosphere from a few thousand Kelvin in the photosphere to millions of degrees in the corona is a major challenge in solar physics. A number of potential ...
  • Martinez-Sykora, Juan; De Moortel, Ineke; De Pontieu, Bart Walter; Hansteen, Viggo; Carlsson, Mats (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    The role of type II spicules in the corona has been a much debated topic in recent years. This paper aims to shed light on the impact of type II spicules in the corona using novel 2.5D radiative MHD simulations, including ...
  • Antolin, Patrick (Doctoral thesis / Doktoravhandling, 2012)
  • Eskilt, Johannes Røsok; Komatsu, Eiichiro (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    The observed pattern of linear polarization of the cosmic microwave background photons is a sensitive probe of physics violating parity symmetry under inversion of spatial coordinates. A new parity-violating interaction ...
  • Tristram, M.; Banday, A.J.; Górski, K.M.; Keskitalo, R.; Lawrence, C.R.; Andersen, Kristian Joten; Barreiro, R.B.; Borrill, J.; Colombo, L.P.L.; Eriksen, Hans Kristian Kamfjord; Fernandez-Cobos, R.; Kisner, T.S.; Martínez-González, E.; Partridge, B.; Scott, D.; Svalheim, Trygve Leithe; Wehus, Ingunn Kathrine (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    We present constraints on the tensor-to-scalar ratio r using a combination of BICEP/Keck 2018 (BK18) and Planck PR4 data allowing us to fit for r consistently with the six parameters of the ΛCDM model. We discuss the ...
  • Toresen, Mikael (Master thesis / Masteroppgave, 2015)
    In this thesis we have implemented a basic radiative transfer code to model the radial Lyα scattering rate around the epoch when the first stars and galaxies start forming, and ionizing their surroundings. The model, builds ...
  • Andersen, Kristian Joten (Doctoral thesis / Doktoravhandling, 2022)
    In this thesis we take a look at the importance of component separation in the processing of data from the Planck satellite mission. We show how integrating component separation in the form of a sky model improves the ...
  • Mertens, Florent G.; Mevius, M.; Koopmans, Leon V. E.; Offringa, A. R.; Mellema, Garrelt; Zaroubi, Saleem; Brentjens, M. A.; Gan, H.; Gehlot, Bharat Kumar; Pandey, V. N.; Sardarabadi, A. M.; Vedantham, Harish K.; Yatawatta, Sarod; Asad, Khan M. B.; Ciardi, B.; Chapman, Emma; Gazagnes, S.; Ghara, R.; Ghosh, Abhik; Giri, Sambit Kumar; Iliev, Ilian T.; Jelić, Vibor; Kooistra, Robin; Mondal, Rajesh; Schaye, Joop; Silva, Marta Bruno (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    A new upper limit on the 21 cm signal power spectrum at a redshift of z ≈ 9.1 is presented, based on 141 h of data obtained with the Low-Frequency Array (LOFAR). The analysis includes significant improvements in spectrally ...
  • Grinon Marin, Ana Belen; Pastor Yabar, Adur; Liu, Yang; Hoeksema, J. Todd; Norton, Aimee A. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Abstract A spectral line inversion code, Very Fast Inversion of the Stokes Vector (VFISV), has been used since 2010 May to infer the solar atmospheric parameters from the spectropolarimetric observations taken ...
  • Svalheim, Trygve Leithe (Master thesis / Masteroppgave, 2018)
    The Planck satellite has provided a multitude of data images of the full microwave sky, or sky maps, since it saw first light in 2009. Its observations of the Cosmic Microwave Background (CMB) data has been paramount in ...
  • Sato, Hiroatsu; Pecseli, Hans Laszlo; Trulsen, Jan Karsten; Sandholt, Per Even; Farrugia, Charles J. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Abstract. It is argued that a simple model based on magnetic image arguments suffices to give a convincing insight into both the basic static as well as some transient dynamic properties of the near-Earth's magnetosphere, ...
  • Di Valentino, Eleonora; Mena, Olga; Pan, Supriya; Visinelli, Luca; Yang, Weiqiang; Melchiorri, Alessandro; Mota, David; Riess, Adam G.; Silk, Joseph (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
     The simplest ΛCDM model provides a good fit to a large span of cosmological data but harbors large areas of phenomenology and ignorance. With the improvement of the number and the accuracy of observations, discrepancies ...
  • Sekse, Dan Henrik (Doctoral thesis / Doktoravhandling, 2013)