Browsing Institutt for teoretisk astrofysikk by Title

Now showing items 1044-1063 of 1279

  • SI IV Resonance Line Emission during Solar Flares: Non-LTE, Nonequilibrium, Radiation Transfer Simulations 
    Kerr, Graham S.; Carlsson, Mats; Allred, Joel C.; Young, Peter R.; Daw, Adrian N. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
  • Signatures of Magnetic Reconnection at the Footpoints of Fan-shaped Jets on a Light Bridge Driven by Photospheric Convective Motions 
    Bai, Xianyong; Socas-Navarro, Hector; Nóbrega Siverio, Daniel Elias; Su, Jiangtao; Deng, Yuanyong; Li, Dong; Cao, Wenda; Ji, Kaifan (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Dynamical jets are generally found on light bridges (LBs), which are key to studying sunspot decay. So far, their formation mechanism is not fully understood. In this paper, we used state-of-the-art observations from the ...
  • Signatures of New Physics in the CMB: From Cosmic Topology to Cosmic Birefringence 
    Eskilt, Johannes Røsok (Doctoral thesis / Doktoravhandling, 2023)
    The cosmic microwave background (CMB) is not just the oldest light in the Universe but also the oldest polarized light. By measuring its patterns, we can learn large amounts of information about the origin of the Universe ...
  • Signatures of ubiquitous magnetic reconnection in the deep atmosphere of sunspot penumbrae 
    Rouppe van der Voort, Luc; Joshi, Jayant; de Jorge Henriques, Vasco Manuel; Bose, Souvik (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Context. Ellerman bombs are regions with enhanced Balmer line wing emission and mark magnetic reconnection in the deep solar atmosphere in active regions and the quiet Sun. They are often found in regions where opposite ...
  • Signatures of ubiquitous magnetic reconnection in the lower solar atmosphere 
    Joshi, Jayant; Rouppe van der Voort, Luc; de la Cruz Rodriguez, Jaime (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Ellerman Bomb-like brightenings of the hydrogen Balmer line wings in the quiet Sun, also known as quiet Sun Ellerman bombs (QSEBs), are a signature of the fundamental process of magnetic reconnection at the smallest ...
  • Simulating Galactic Dynamo Processes with Smoothed Particle Magnetohydrodynamics 
    Wissing, Robert (Doctoral thesis / Doktoravhandling, 2022)
    When we look out at the universe, we find that magnetic fields are everywhere. From solar flares to the launching of jets, magnetic fields play an important role for a wide range of systems. This includes galaxies, which ...
  • A simulation-based evaluation of the millimetre continuum as a new diagnostic tool for stellar chromospheres 
    Thrane, Jonas Ringdalen (Master thesis / Masteroppgave, 2023)
  • Slender Ca II H Fibrils Mapping Magnetic Fields in the Low Solar Chromosphere 
    Jafarzadeh, Shahin; Rutten, Robert; Solanki, S. K.; Wiegelmann, T.; Riethmüller, T. L.; van Noort, M.; Szydlarski, Mikolaj Marcin; Blanco Rodriguez, J.; Barthol, P.; del Toro Iniesta, J. C.; Gandorfer, A.; Gizon, L; Hirzberger, J.; Knölker, M.; Martinez Pillet, V.; Orozco Suarez, D.; Schmidt, W. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    A dense forest of slender bright fibrils near a small solar active region is seen in high-quality narrowband Ca ii H images from the SuFI instrument onboard the Sunrise balloon-borne solar observatory. The orientation of ...
  • Slicing the cool circumgalactic medium along the major axis of a star-forming galaxy at z = 0.7 
    Lopez, S.; Tejos, N.; Barrientos, L. F.; Ledoux, C.; Sharon, Keren; Katsianis, A.; Florian, M. K.; Rivera-Thorsen, Thøger Emil Juul; Bayliss, Matthew B.; Dahle, Håkon; Fernandez-Figueroa, A.; Gladders, Michael D.; Gronke, Max Balthasar; Hamel, M.; Pessa, I.; Rigby, Jane R. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    We present spatially resolved Echelle spectroscopy of an intervening Mg II–Fe II–Mg I absorption-line system detected at zabs = 0.73379 towards the giant gravitational arc PSZ1 G311.65–18.48. The absorbing gas is associated ...
  • Slow Solar Wind Connection Science during Solar Orbiter’s First Close Perihelion Passage 
    Yardley, Stephanie L.; Owen, Christopher J.; Long, David M.; Baker, Deborah; Brooks, David H.; Polito, Vanessa; Green, Lucie M.; Matthews, Sarah; Owens, Mathew; Lockwood, Mike; Stansby, David; James, Alexander W.; Valori, Gherardo; Giunta, Alessandra; Janvier, Miho; Ngampoopun, Nawin; Mihailescu, Teodora; To, Andy S. H.; van Driel-Gesztelyi, Lidia; Démoulin, Pascal; D’Amicis, Raffaella; French, Ryan J.; Suen, Gabriel H. H.; Rouillard, Alexis P.; Pinto, Rui F.; Réville, Victor; Watson, Christopher J.; Walsh, Andrew P.; De Groof, Anik; Williams, David R.; Zouganelis, Ioannis; Müller, Daniel; Berghmans, David; Auchère, Frédéric; Harra, Louise; Schuehle, Udo; Barczynski, Krysztof; Buchlin, Éric; Cuadrado, Regina Aznar; Kraaikamp, Emil; Mandal, Sudip; Parenti, Susanna; Peter, Hardi; Rodriguez, Luciano; Schwanitz, Conrad; Smith, Phil; Teriaca, Luca; Verbeeck, Cis; Zhukov, Andrei N.; De Pontieu, Bart Walter; Horbury, Tim; Solanki, Sami K.; del Toro Iniesta, José Carlos; Woch, Joachim; Gandorfer, Achim; Hirzberger, Johann; Orozco Súarez, David; Appourchaux, Thierry; Calchetti, Daniele; Sinjan, Jonas; Kahil, Fatima; Albert, Kinga; Volkmer, Rainer; Carlsson, Mats; Fludra, Andrzej; Hassler, Don; Caldwell, Martin; Fredvik, Terje; Grundy, Tim; Guest, Steve; Haberreiter, Margit; Leeks, Sarah; Pelouze, Gabriel; Plowman, Joseph; Schmutz, Werner; Sidher, Sunil; Thompson, William T.; Louarn, Philippe; Federov, Andrei (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Abstract The Slow Solar Wind Connection Solar Orbiter Observing Plan (Slow Wind SOOP) was developed to utilize the extensive suite of remote-sensing and in situ instruments on board the ESA/NASA Solar Orbiter ...
  • Small Region, Big Impact: Highly Anisotropic Lyman-continuum Escape from a Compact Starburst Region with Extreme Physical Properties 
    Kim, Keunho J.; Bayliss, Matthew B.; Rigby, Jane R.; Gladders, Michael D.; Chisholm, John; Sharon, Keren; Dahle, Håkon; Rivera-Thorsen, Thøger Emil Juul; Florian, Michael K.; Khullar, Gourav; Mahler, Guillaume; Mainali, Ramesh; Napier, Kate A.; Navarre, Alexander; Owens, M. Riley; Roberson, Joshua (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Abstract Extreme, young stellar populations are considered to be the primary contributor to cosmic reionization. How the Lyman continuum (LyC) escapes these galaxies remains highly elusive, and it is challenging ...
  • Small-scale Heating Events in the Solar Atmosphere. I. Identification, Selection, and Implications for Coronal Heating 
    Guerreiro, Nuno Miguel Rodrigues; Haberreiter, M.; Hansteen, Viggo; Schmutz, W (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    We present a comprehensive method to analyze small-scale heating events in detail in a 3D magnetohydrodynamics simulation for quiet-Sun conditions. The method determines the number, volume, and some general geometric ...
  • Small-scale heating events in the solar atmosphere: II. Lifetime, total energy, and magnetic properties 
    Guerreiro, Nuno Miguel Rodrigues; Haberreiter, M.; Hansteen, Viggo; Schmutz, W. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    Context. Small-scale heating events (SSHEs) are believed to play a fundamental role in understanding the process responsible for heating of the solar corona, the pervading redshifts in the transition region, and the ...
  • Small-scale Intensity Mapping: Extended Halos as a Probe of the Ionizing Escape Fraction and Faint Galaxy Populations during Reionization 
    Mas Ribas, Lluis; Hennawi, J. F.; Dijkstra, Mark; Davies, Frederick B.; Stern, Jonathan; Rix, Hans-Walter (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    © 2017. The American Astronomical Society. All rights reserved.
  • Small-scale Intensity Mapping: Extended Lyα, Hα, and Continuum Emission as a Probe of Halo Star Formation in High-redshift Galaxies 
    Mas Ribas, Lluis; Dijkstra, Mark; Hennawi, J. F.; Trenti, Michele; Momose, Rieko; Ouchi, Masami (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    © 2017. The American Astronomical Society. All rights reserved.
  • Small-scale Magnetic Flux Emergence in the Quiet Sun 
    Moreno-Insertis, F.; Martinez-Sykora, Juan; Hansteen, Viggo; Munoz, D. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    Small bipolar magnetic features are observed to appear in the interior of individual granules in the quiet Sun, signaling the emergence of tiny magnetic loops from the solar interior. We study the origin of those features ...
  • Smoothed particle magnetohydrodynamics with the geometric density average force expression 
    Wissing, Robert; Shen, Sijing (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    We present a novel method of magnetohydrodynamics (MHD) within the smoothed particle hydrodynamics scheme (SPMHD) using the geometric density average force expression. Geometric density average within smoothed particle ...
  • SOAR/Goodman Spectroscopic Assessment of Candidate Counterparts of the LIGO/Virgo Event GW190814 
    Tucker, D.L.; Wiesner, M.P.; Allam, S.S.; Soares-Santos, M.; Bom, C.R.; Butner, M.; Garcia, A.; Morgan, R.; Olivares E., E.; Palmese, A.; Santana-Silva, L.; Shrivastava, A.; Annis, J.; García-Bellido, J.; Gill, M.S.S.; Herner, K.; Kilpatrick, C.D.; Makler, M.; Sherman, N.; Amara, A.; Lin, H.; Smith, M.; Swann, E.; Arcavi, I.; Bachmann, T.G.; Bechtol, K.; Berlfein, F.; Briceño, C.; Brout, D.; Butler, R.E.; Cartier, R.; Casares, J.; Chen, H.-Y.; Conselice, C.; Contreras, C.; Cook, E.; Cooke, J.; Dage, K.; D'Andrea, C.; Davis, T.M.; de Carvalho, R.; Diehl, H.T.; Dietrich, J.P.; Doctor, Z.; Drlica-Wagner, A.; Drout, M.; Farr, B.; Finley, D.A.; Fishbach, M.; Foley, R.J.; Förster-Burón, F.; Fosalba, P.; Friedel, D.; Frieman, J.; Frohmaier, C.; Gruendl, R.A.; Hartley, W.G.; Hiramatsu, D.; Holz, D.E.; Howell, D.A.; Kawash, A.; Kessler, R.; Kuropatkin, N.; Lahav, O.; Lundgren, A.; Lundquist, M.; Malik, U.; Mann, A.W.; Marriner, J.; Marshall, J.L.; Martínez-Vázquez, C.E.; McCully, C.; Menanteau, F.; Meza, N.; Narayan, G.; Neilsen, E.; Nicolaou, C.; Nichol, R.; Paz-Chinchón, F.; Pereira, M.E.S.; Pineda, J.; Points, S.; Quirola-Vásquez, J.; Rembold, S.; Rest, A.; Rodriguez, O.; Romer, A.K.; Sako, M.; Salim, S.; Scolnic, D.; Smith, J.A.; Strader, J.; Sullivan, M.; Swanson, M.E.C.; Thomas, D.; Valenti, S.; Varga, T.N.; Walker, A.R.; Weller, J.; Wood, M.L.; Yanny, B.; Zenteno, A.; Aguena, M.; Andrade-Oliveira, F.; Bertin, E.; Brooks, D.; Burke, D.L.; Carnero Rosell, A.; Carrasco Kind, M.; Carretero, J.; Costanzi, M.; da Costa, L.N.; De Vicente, J.; Desai, S.; Everett, S.; Ferrero, Ismael; Flaugher, B.; Gaztanaga, E.; Gerdes, D.W.; Gruen, D.; Gschwend, J.; Gutierrez, G.; Hinton, S.R.; Hollowood, D.L.; Honscheid, K.; James, D.J.; Kuehn, K.; Lima, M.; Maia, M.A.G.; Miquel, R.; Ogando, R.L.C.; Pieres, A.; Plazas Malagón, A.A.; Rodriguez-Monroy, M.; Sanchez, E.; Scarpine, V.; Schubnell, M.; Serrano, S.; Sevilla-Noarbe, I.; Suchyta, E.; Tarle, G.; To, C.; Zhang, Y. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    On 2019 August 14 at 21:10:39 UTC, the LIGO/Virgo Collaboration (LVC) detected a possible neutron star–black hole merger (NSBH), the first ever identified. An extensive search for an optical counterpart of this event, ...
  • Solar atmosphere radiative transfer model comparison based on 3D MHD simulations 
    Haberreiter, Margit; Criscuoli, Serena; Rempel, M.; Pereira, Tiago (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Context. The reconstruction of the solar spectral irradiance (SSI) on various time scales is essential for the understanding of the Earth’s climate response to the SSI variability. Aims. The driver of the SSI variability ...
  • Solar Hα features with hot onsets: II. A contrail fibril 
    Rutten, Robert; Rouppe, Van Der Voort Luc (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    The solar chromosphere observed in Hα consists mostly of narrow fibrils. The longest typically originate in network or plage and arch far over adjacent internetwork. We use data from multiple telescopes to analyze one ...