Browsing Institutt for teoretisk astrofysikk by Title

Now showing items 459-478 of 1278

  • The FABLE simulations: A feedback model for galaxies, groups, and clusters 
    Henden, Nicholas A; Puchwein, Ewald; Shen, Sijing; Sijacki, Debora (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    We present the Feedback Acting on Baryons in Large-scale Environments suite of cosmological hydrodynamical simulations of galaxies, groups, and clusters. The simulations use the AREPO moving-mesh code with a set of physical ...
  • Fan-shaped jets above the light bridge of a sunspot driven by reconnection 
    Robustini, Carolina; Leenaarts, Jorrit; de la Cruz Rodriguez, Jaime; Rouppe, Van Der Voort Luc (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)
    We report on a fan-shaped set of high-speed jets above a strongly magnetized light bridge (LB) of a sunspot observed in the Hα line. We study the origin, dynamics, and thermal properties of the jets using high-resolution ...
  • Fast generation of realistic SZ maps using machine learning methodsRestricted Access 
    Ingstad, Magnus Sikora (Master thesis / Masteroppgave, 2022)
  • Fast prograde coronal flows in solar active regions 
    Hudson, Hugh S.; Mulay, Sargam M.; Fletcher, Lyndsay; Docherty, Jennifer; Fitzpatrick, Jimmy; Pike, Eleanor; Strong, Morven; Chamberlin, Phillip C.; Woods, Thomas N. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    ABSTRACT We report the discovery and characterization of high-speed (>100 km s−1) horizontal flows in solar active regions, making use of the Sun-as-a-star spectroscopy in the range 5–105 nm provided by ...
  • Fast Solar Image Classification Using Deep Learning and Its Importance for Automation in Solar Physics 
    Armstrong, John A.; Fletcher, Lyndsay (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    The volume of data being collected in solar physics has exponentially increased over the past decade and with the introduction of the Daniel K. Inouye Solar Telescope (DKIST) we will be entering the age of petabyte solar ...
  • Feeding of plankton in a turbulent environment: A comparison of analytical and observational results covering also strong turbulence 
    Pécseli, Hans L.; Trulsen, Jan K.; Stiansen, Jan Erik; Sundby, Svein (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    The present studies address feeding of plankton in turbulent environments, discussed by a comparison of analytical results and field data. Various models for predator-prey encounters and capture probabilities are reviewed. ...
  • Feeding of plankton in turbulent oceans and lakes 
    Pécseli, Hans L.; Trulsen, Jan K.; Stiansen, Jan Erik; Sundby, Svein; Fossum, Petter (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Analytical models for the statistical distribution of the gut content of fish larvae in a turbulent ocean environment are compared to data obtained in a field experiment. The proposed model allows the nutrition state and ...
  • Filament Leg-Leg Reconnection as a Source of Prominent Supra-arcade Downflows 
    Dudík, Jaroslav; Aulanier, Guillaume; Kašparová, Jana; Karlický, Marian; Zemanová, Alena; Lörinčík, Juraj; Druckmüller, Miloslav (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Abstract We report on the interaction of the legs of the erupting filament of 2012 August 31 and associated prominent supra-arcade downflows (P-SADs) as observed by the Atmospheric Imaging Assembly on board the ...
  • Finding quadruply imaged quasars with machine learning – I. Methods 
    Akhazhanov, A.; More, A.; Amini, A.; Hazlett, C.; Treu, T.; Birrer, S.; Shajib, A.; Liao, K.; Lemon, C.; Agnello, A.; Nord, B.; Aguena, Michel; Allam, Sahar; Andrade-Oliveira, Felipe; Annis, J.; Brooks, D.; Buckley-Geer, E.; Burke, David L.; Carnero Rosell, Aurelio; Carrasco Kind, Matias; Carretero, J.; Choi, A.; Conselice, Christopher J.; Costanzi, M.; da Costa, L. N.; Pereira, M.E.S.; De Vicente, J.; Desai, S.; Dietrich, J.P.; Doel, P.; Everett, S.; Ferrero, Ismael; Finley, D.A.; Flaugher, Brenna; Frieman, Josh; García-Bellido, Juan; Gerdes, David W.; Gruen, D.; Gruendl, Robert A.; Gschwend, J.; Gutierrez, G.; Hinton, Samuel R.; Hollowood, Devon L.; Honscheid, Klaus; James, D.J.; Kim, A.G.; Kuehn, K.; Kuropatkin, Nikolay; Lahav, Ofer; Lima, M.; Lin, H.; Maia, Marcio A. G.; March, M.; Menanteau, Felipe; Miquel, R.; Morgan, R.; Palmese, Antonella; Paz-Chinchón, Francisco; Pieres, A.; Plazas Malagón, Andrés A.; Sanchez, E.; Scarpine, Vic; Serrano, S.; Sevilla-Noarbe, Ignacio; Smith, M.; Soares-Santos, Marcelle; Suchyta, Eric; Swanson, Molly E. C.; Tarlé, Gregory; To, C.; Varga, Tamas Norbert; Weller, Jochen (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    ABSTRACT Strongly lensed quadruply imaged quasars (quads) are extraordinary objects. They are very rare in the sky and yet they provide unique information about a wide range of topics, including the expansion ...
  • Finding the Roots of Microturbulence 
    Kuperus, Ilse (Master thesis / Masteroppgave, 2022)
    We made one-dimensional optical depth averages by averaging a Bifrost 3D model, and added four different microturbulence recipes to this average. Then we compared Ca~II 854.2 nm synthetic line profiles for these average ...
  • Fine-scale Explosive Energy Release at Sites of Prospective Magnetic Flux Cancellation in the Core of the Solar Active Region Observed by Hi-C 2.1, IRIS, and SDO 
    Tiwari, Sanjiv K.; Panesar, Navdeep K.; Moore, Ronald L.; De Pontieu, Bart Walter; Winebarger, Amy R.; Golub, Leon; Savage, Sabrina L.; Rachmeler, L. A.; Kobayashi, Ken; Testa, Paola; Warren, Harry P.; Brooks, David H.; Cirtain, Jonathan W.; McKenzie, David E.; Morton, Richard J.; Peter, Hardi; Walsh, Robert W. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    The second Hi-C flight (Hi-C 2.1) provided unprecedentedly high spatial and temporal resolution (~250 km, 4.4 s) coronal EUV images of Fe ix/x emission at 172 Å of AR 12712 on 2018 May 29, during 18:56:21–19:01:56 UT. Three ...
  • First analysis of solar structures in 1.21 mm full-disc ALMA image of the Sun 
    Brajša, R.; Sudar, D.; Benz, A. O.; Skokić, I.; Bárta, M.; De Pontieu, Bart Walter; Kim, S.; Kobelski, A.; Kuhar, M.; Shimojo, M.; Wedemeyer, Sven; White, S.; Yagoubov, P.; Yan, Y. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    Context: Various solar features can be seen in emission or absorption on maps of the Sun in the millimetre and submillimetre wavelength range. The recently installed Atacama Large Millimetre/submillimetre Array (ALMA) is ...
  • A First Comparison of Millimeter Continuum and Mg II Ultraviolet Line Emission from the Solar Chromosphere 
    Bastian, T. S.; Chintzoglou, G.; De Pontieu, Bart Walter; Shimojo, M.; Schmit, D.; Leenaarts, Jorrit; Loukitcheva, M. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    We present joint observations of the Sun by the Atacama Large Millimeter/submillimeter Array (ALMA) and the Interface Region Imaging Spectrograph (IRIS). Both millimeter/submillimeter-λ continuum emission and ultraviolet ...
  • First detection of AlF line emission towards M-type AGB stars 
    Saberi, Maryam; Khouri, T.; Velilla-Prieto, L.; Fonfría, J.P.; Vlemmings, W.H.T.; Wedemeyer, Sven (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    The nucleosynthesis production of fluorine (F) is still a matter of debate. Asymptotic giant branch (AGB) stars are one of the main candidates for F production. However, their contribution to the total F budget is not fully ...
  • First direct observation of a torsional Alfvén oscillation at coronal heights 
    Kohutova, Petra; Verwichte, Erwin; Froment, Clara (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Context. Torsional Alfvén waves are promising candidates for the transport of energy across different layers of the solar atmosphere. They have been predicted theoretically for decades. Previous detections of Alfvén waves ...
  • First high resolution interferometric observation of a solar prominence with ALMA 
    Labrosse, Nicolas; Rodger, Andrew S.; Radziszewski, Krzysztof; Rudawy, Paweł; Antolin, Patrick; Fletcher, Lyndsay; Levens, Peter J.; Peat, Aaron W.; Schmieder, Birgitte; Simões, Paulo J.A. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    ABSTRACT We present the first observation of a solar prominence at 84 − 116 GHz using the high resolution interferometric imaging of ALMA. Simultaneous observations in Hα from Białkaw Observatory and with SDO/AIA ...
  • First high-resolution look at the quiet Sun with ALMA at 3mm 
    Nindos, A.; Alissandrakis, C. E.; Bastian, T. S.; Patsourakos, S.; De Pontieu, Bart Walter; Warren, H.; Ayres, T.; Hudson, H. S.; Shimizu, T.; Vial, J.-C.; Wedemeyer, Sven; Yurchyshyn, V. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    We present an overview of high-resolution quiet Sun observations, from disk center to the limb, obtained with the Atacama Large millimeter and sub-millimeter Array (ALMA) at 3 mm. Seven quiet-Sun regions were observed at ...
  • First High-Resolution Spectroscopic Observations of an Erupting Prominence within a Coronal Mass Ejection by the Interface Region Imaging Spectrograph (IRIS) 
    Liu, W.; De Pontieu, Bart Walter; Vial, J.-C.; Title, Alan M.; Carlsson, Mats; Uitenbroek, Han; Okamoto, T. J.; Berger, Thomas E.; Antolin, Patrick (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    Spectroscopic observations of prominence eruptions associated with coronal mass ejections (CMEs), although relatively rare, can provide valuable plasma and three-dimensional geometry diagnostics. We report the first ...
  • First observations from the SPICE EUV spectrometer on Solar Orbiter 
    Fludra, Andrzej; Caldwell, M.; Giunta, A.; Grundy, T.; Guest, S.; Leeks, S.; Sidher, S.; Auchère, Frédéric; Carlsson, Mats; Hassler, D.; Peter, Hardi; Aznar Cuadrado, R.; Buchlin, Éric; Caminade, S.; DeForest, C.; Fredvik, Terje; Haberreiter, Margit; Harra, Louise K.; Janvier, M.; Kucera, T.; Müller, Daniel; Parenti, S.; Schmutz, W.; Schüle, U.; Solanki, Sami K.; Teriaca, L.; Thompson, W. T.; Tustain, S.; Williams, D.; Young, P. R.; Chitta, Lakshmi Pradeep (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Aims. We present first science observations taken during the commissioning activities of the Spectral Imaging of the Coronal Environment (SPICE) instrument on the ESA/NASA Solar Orbiter mission. SPICE is a high-resolution ...
  • First perihelion of EUI on the Solar Orbiter mission 
    Berghmans, D.; Antolin, Patrick; Auchère, F.; Aznar Cuadrado, R.; Barczynski, K.; Chitta, L.P.; Gissot, S.; Harra, L.; Huang, Z.; Janvier, M.; Kraaikamp, E.; Long, D.M.; Mandal, S.; Mierla, M.; Parenti, S.; Peter, H.; Rodriguez, L.; Schühle, U.; Smith, P.J.; Solanki, S.K.; Stegen, K.; Teriaca, L.; Verbeeck, C.; West, M.J.; Zhukov, A.N.; Appourchaux, T.; Aulanier, Guillaume; Buchlin, E.; Delmotte, F.; Gilles, J.M.; Haberreiter, M.; Halain, J.-P.; Heerlein, K.; Hochedez, J.-F.; Gyo, M.; Poedts, S.; Renotte, E.; Rochus, P. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Context. The Extreme Ultraviolet Imager (EUI) on board Solar Orbiter consists of three telescopes: the two High Resolution Imagers, in EUV (HRI EUV ) and in Lyman- α (HRI Lya ), and the Full Sun Imager (FSI). Solar Orbiter/EUI ...