Now showing items 2-21 of 680

  • Thommesen, Harald; Andersen, Kristian Joten; Aurlien, Ragnhild; Banerji, Ranajoy; Brilenkov, Maksym; Fuskeland, Unni; Eriksen, Hans Kristian Kamfjord; Galloway, Mathew; Mocanu, Laura-Monica; Svalheim, Trygve Leithe; Wehus, Ingunn Kathrine (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    We review and compare two different cosmic microwave background (CMB) dipole estimators discussed in the literature and assess their performances through Monte Carlo simulations. The first method amounts to simple template ...
  • Drews, Ainar; Rouppe van der Voort, Luc (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Context. Penumbral microjets (PMJs) are short-lived, jet-like objects found in the penumbra of sunspots. They were first discovered in chromospheric lines and have later also been shown to exhibit signals in transition ...
  • Wissing, Robert; Hobbs, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    We present a new analytical equation of state (EOS), which correctly models high pressure theory and fits well to the experimental data of ɛ-Fe, SiO2, Mg2, and the Earth. The cold part of the EOS is modeled after the Varpoly ...
  • Bobra, Monica G; Mumford, Stuart J; Hewett, Russell J; Christe, Steven D; Reardon, Kevin P.; Savage, Sabrina L.; Ireland, Jack; Mendes Domingos Pereira, Tiago; Chen, Bin; Pérez-Suárez, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    The SunPy Project developed a 13-question survey to understand the software and hardware usage of the solar-physics community. Of the solar-physics community, 364 members across 35 countries responded to our survey. We ...
  • Frogner, Lars; Gudiksen, Boris Vilhelm; Bakke, Helle (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Context. Observational and theoretical evidence suggest that beams of accelerated particles are produced in flaring events of all sizes in the solar atmosphere, from X-class flares to nanoflares. Current models of these ...
  • Bakke, Helle Merethe (Master thesis / Masteroppgave, 2018)
  • Chisholm, John; Gazagnes, S; Schaerer, Daniel; Verhamme, Anne; Rigby, Jane R.; Bayliss, Matthew B.; Sharon, Keren; Gladders, Michael D.; Dahle, Håkon (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    The fraction of ionizing photons that escape high-redshift galaxies sensitively determines whether galaxies reionized the early Universe. However, this escape fraction cannot be measured from high-redshift galaxies because ...
  • Al-Janabi, Khalid; Antolin, Patrick; Baker, Deborah; Bellot Rubio, Luis R.; Bradley, Louisa; Brooks, David H.; Centeno, Rebecca; Culhane, J. Leonard; Del Zanna, Giulio; Doschek, George A.; Fletcher, Lyndsay; Hara, Hirohiso; Harra, Louise K.; Hillier, Andrew S.; Imada, Shinsuke; Klimchuk, James A.; Mariska, John T.; Mendes Domingos Pereira, Tiago; Reeves, Katharine K.; Sakao, Taro; Sakurai, Takashi; Shimizu, Toshifumi; Shimojo, Masumi; Shiota, Daikou; Solanki, Sami K.; Sterling, Alphonse C.; Su, Yingna; Suematsu, Yoshinori; Tarbell, Theodore D.; Tiwari, Sanjiv K.; Toriumi, Shin; Ugarte-Urra, Ignacio; Warren, Harry P.; Watanabe, Tetsuya; Young, Peter R. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Hinode is Japan’s third solar mission following Hinotori (1981–1982) and Yohkoh (1991–2001): it was launched on 2006 September 22 and is in operation currently. Hinode carries three instruments: the Solar Optical Telescope, ...
  • de Moortel, Ineke; Falconer, Isobel; Stack, Robert (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Abstract Ineke De Moortel, Isobel Falconer and Robert Stack explore the achievements and influence of Hannes Alfvén, in particular his seminal Monthly Notices paper of 1947 on the heating of the solar corona.
  • Bradač, Maruša; Garcia-Appadoo, Diego; Huang, Kuang-Han; Vallini, Livia; Finney, Emily Quinn; Hoag, Austin; Lemaux, Brian C.; Schmidt, Kasper B.; Treu, Tommaso; Carilli, Chris; Dijkstra, Mark; Ferrara, Andrea; Fontana, Adriano; Jones, Tucker; Ryan, Russell; Wagg, Jeff; Gonzalez, Anthony H. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    © 2017. The American Astronomical Society. All rights reserved.
  • Nguyen, Nathen H.; Lira, Paulina; Trakhtenbrot, Benny; Netzer, Hagai; Cicone, Claudia; Maiolino, Roberto; Shemmer, Ohad (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    We present ALMA Band 7 data of the[CII]lm157.74memission line and underlying far-IR(FIR)continuum for12 luminous quasars atz4.8powered by fast-growing supermassive black holes(SMBHs). Our totalsample consists of 18 ...
  • da Silva Santos, João Manuel; de la Cruz Rodriguez, Jaime; White, S. M.; Leenaarts, Jorrit; Vissers, Gregal Joan Maria; Hansteen, Viggo (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Aims. We aim to investigate the temperature enhancements and formation heights of solar active-region brightenings such as Ellerman bombs (EBs), ultraviolet bursts (UVBs), and flaring active-region fibrils (FAFs) using ...
  • Arbey, Alexandre; Auffinger, Jérémy; Hickerson, KP; Jenssen, Espen Sem (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    We present the version 2 of AlterBBN, an open public code for the calculation of the abundance of the elements from Big-Bang nucleosynthesis. It does not rely on any closed external library or program, aims at being ...
  • Nóbrega Siverio, Daniel Elias; Martinez-Sykora, Juan; Moreno-Insertis, Fernando; Carlsson, Mats (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Context. Ambipolar diffusion is a physical mechanism related to the drift between charged and neutral particles in a partially ionized plasma that is key to many different astrophysical systems. However, understanding its ...
  • Mendes Domingos Pereira, Tiago; Rouppe, Van Der Voort Luc; Carlsson, Mats (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)
    Solar spicules are chromospheric fibrils that appear everywhere on the Sun, yet their origin is not understood. Using high resolution observations of spicules obtained with the Swedish 1 m Solar Telescope, we aim to ...
  • Mikkelsen, Kristin (Doctoral thesis / Doktoravhandling, 2014)
  • Fantaye, Yabebal Tadesse; Marinucci, Domenico; Hansen, Frode Kristian; Maino, Davide (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    The Gaussian kinematic formula (GKF) [R. J. Adler and J. E. Taylor, Random Fields and Geometry (Springer, New York, 2007).] is an extremely powerful tool allowing for explicit analytic predictions of expected values of ...
  • Pettersen, Bjørn Ragnvald (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    We present unpublished observations of Comet Donati 1858 V recently recovered in an old storage facility at the University Observatory in Oslo. Carefully-made drawings reveal temporal changes in the appearance of this ...
  • Sivertsen, Sofie Vike (Master thesis / Masteroppgave, 2011)
    The existence of dark matter is a well established fact both due to galaxy rotation curves and also due to the CMB temperature anisotropies and the matter power spectra. According to the $\Lambda$CDM model, the so called ...