Browsing Institutt for teoretisk astrofysikk by Title

Now showing items 979-998 of 1279

  • Probing the Physics of the Solar Atmosphere with the Multi-slit Solar Explorer (MUSE). II. Flares and Eruptions 
    Cheung, Mark C. M.; Martinez-Sykora, Juan; Testa, Paola; De Pontieu, Bart Walter; Chintzoglou, Georgios; Rempel, Matthias; Polito, Vanessa; Kerr, Graham S.; Reeves, Katharine K.; Fletcher, Lyndsay; Jin, Meng; Nóbrega Siverio, Daniel Elias; Danilovic, Sanja; Antolin, Patrick; Allred, Joel; Hansteen, Viggo Haraldson; Ugarte-Urra, Ignacio; DeLuca, Edward; Longcope, Dana; Takasao, Shinsuke; DeRosa, Marc L.; Boerner, Paul; Jaeggli, Sarah; Nitta, Nariaki V.; Daw, Adrian; Carlsson, Mats; Golub, Leon (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Current state-of-the-art spectrographs cannot resolve the fundamental spatial (subarcseconds) and temporal (less than a few tens of seconds) scales of the coronal dynamics of solar flares and eruptive phenomena. The ...
  • Progress in the Design of the Atacama Large Aperture Submillimeter Telescope 
    Mroczkowski, Tony; Cicone, Claudia; Reichert, Matthias; Gallardo, Patricio A.; Kaercher, Hans; Hills, Richard; Bok, Daniel; Dahl, Erik; Dubois-Dit-Bonclaude, Pierre; Kiselev, Aleksej; Timpe, Martin; Zimmerer, Thomas; Dicker, Simon R.; Macintosh, Mike; Klaassen, Pamela D.; Niemack, Michael D. (Chapter / Bokkapittel / PublishedVersion; Peer reviewed, 2023)
    The Atacama Large Aperture Submillimeter Telescope (At- LAST) aims to be the premier next generation large diameter (50 meter) single dish observatory capable of observations across the millimeter/submillimeter spectrum, ...
  • Propagating Alfvén waves in open structures with random structuring 
    Pascoe, David J.; de Moortel, Ineke; Pagano, P.; Howson, T. A. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    ABSTRACT We consider the behaviour of Alfvén waves propagating in a medium with random density perturbations. The imposed density perturbations have a broad-band spectrum and their characteristic spatial scale ...
  • Propagating Spectropolarimetric Disturbances in a Large Sunspot 
    Stangalini, M.; Jafarzadeh, Shahin; Ermolli, I.; Erdélyi, R.; Jess, D. B.; Keys, P. H.; Giorgi, F.; Murabito, M.; Berrilli, F.; Del Moro, D. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    We present results derived from the analysis of spectropolarimetric measurements of active region AR12546, which represents one of the largest sunspots to have emerged onto the solar surface over the last 20 years. The ...
  • Propagation of transverse waves in the solar chromosphere probed at different heights with ALMA sub-bands 
    Guevara Gomez, Juan Camilo; Jafarzadeh, Shahin; Wedemeyer, Sven; Szydlarski, Mikolaj (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    The Atacama Large Millimeter/sub-millimeter Array (ALMA) has provided us with an excellent diagnostic tool for studies of the dynamics of the Solar chromosphere, albeit through a single receiver band at one time presently. ...
  • Properties of shock waves in the quiet-Sun chromosphere 
    Mathur, Harsh; Joshi, Jayant; Nagaraju, K.; Rouppe van der Voort, Luc; Bose, Souvik (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Context. Short-lived (100 s or less), sub-arcsec to a couple of arcsec sized features of enhanced brightenings in the narrowband images at the H 2V and K 2V positions of the Ca  II H&K lines in the quiet Sun are known ...
  • Properties of the multiphase outflows in local (ultra)luminous infrared galaxies 
    Fluetsch, Andrin; Maiolino, Roberto; Carniani, Stefano; Arribas, S.; Belfiore, Francesco; Bellocchi, E.; Cazzoli, S.; Cicone, Claudia; Cresci, G.; Fabian, Andrew C.; Gallagher, R.; Ishibashi, W.; Mannucci, F.; Marconi, A.; Perna, M.; Sturm, E.; Venturi, Giacomo (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Galactic outflows are known to consist of several gas phases; however, the connection between these phases has been investigated little and only in a few objects. In this paper, we analyse Multi Unit Spectroscopic Explorer ...
  • Properties of ubiquitous magnetic reconnection events in the lower solar atmosphere 
    Joshi, Jayant; Rouppe van der Voort, Luc (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Context. Magnetic reconnection in the deep solar atmosphere can give rise to enhanced emission in the Balmer hydrogen lines, a phenomenon referred to as Ellerman bombs. Recent high-quality Hβ observations indicate that ...
  • Prospects and challenges of numerical modeling of the Sun at millimeter wavelengths 
    Wedemeyer, Sven; Fleishman, Gregory; de la Cruz Rodríguez, Jaime; Gunár, Stanislav; da Silva Santos, João M.; Antolin, Patrick; Guevara Gomez, Juan Camilo; Szydlarski, Mikolaj; Eklund, Henrik (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    The Atacama Large Millimeter/submillimeter Array (ALMA) offers new diagnostic possibilities that complement other commonly used diagnostics for the study of the Sun. In particular, ALMA’s ability to serve as an essentially ...
  • Prospects for detecting dipolar asymmetry in Planck polarization data 
    Bastnes, Simen Nyhus (Master thesis / Masteroppgave, 2018)
    In the 2015 Planck Isotropy and Statistics article, the dipolar asymmetry previously found in the WMAP data (Hansen et al. 2009) was found to extend to the smallest scales. While the statistical significance of this anomaly ...
  • Prospects for high-z cluster detections with Planck, based on a follow-up of 28 candidates using MegaCam at CFHT 
    van der Burg, R. F. J.; Aussel, H; Pratt, G. W.; Arnaud, Monique; Melin, J.-B.; Aghanim, Nabila; Barrena, R.; Dahle, Håkon; Douspis, M.; Ferragamo, A; Fromenteau, S.; Herbonnet, R.; Hurier, G.; Pointecouteau, E.; Rubiño-Martín, J. A.; Streblyanska, A (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)
    The Planck catalogue of SZ sources limits itself to a significance threshold of 4.5 to ensure a low contamination rate by false cluster candidates. This means that only the most massive clusters at redshift z> 0.5, and in ...
  • A publicly available simulation of an enhanced network region of the Sun 
    Carlsson, Mats; Hansteen, Viggo; Gudiksen, Boris Vilhelm; Leenaarts, Jorrit; De Pontieu, Bart Walter (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)
    Context. The solar chromosphere is the interface between the solar surface and the solar corona. Modelling of this region is difficult because it represents the transition from optically thick to thin radiation escape, ...
  • Pushing automated morphological classifications to their limits with the Dark Energy Survey 
    Vega-Ferrero, Jesús; Domínguez Sánchez, Helena; Bernardi, Mariangela; Huertas-Company, M.; Morgan, R.; Margalef, B.; Aguena, Michel; Allam, Sahar; Annis, James; Avila, S.; Bacon, D.; Bertin, Emmanuel; Brooks, D.; Carnero Rosell, Aurelio; Carrasco Kind, Matias; Carretero, Jorge; Choi, A.; Conselice, Christopher; Costanzi, Matteo; da Costa, Luiz N.; Pereira, Maria Elidaiana da Silva; De Vicente, Juan; Desai, S.; Ferrero, Ismael; Fosalba, Pablo; Frieman, Josh; García-Bellido, Juan; Gruen, Daniel; Gruendl, Robert A.; Gschwend, Julia; Gutierrez, G.; Hartley, William G.; Hinton, Samuel R.; Hollowood, Devon L.; Honscheid, Klaus; Hoyle, B.; Jarvis, M.; Kim, Alex G.; Kuehn, Kyler; Kuropatkin, Nikolay; Lima, M.; Maia, Marcio A. G.; Menanteau, Felipe; Miquel, Ramon; Ogando, Ricardo L. C.; Palmese, Antonella; Paz-Chinchón, Francisco; Plazas, Andrés A.; Romer, A. K.; Sanchez, E.; Scarpine, Vic; Schubnell, M.; Serrano, S.; Sevilla-Noarbe, Ignacio; Smith, Mathew; Suchyta, Eric; Swanson, Molly E. C.; Tarlé, Gregory; Tarsitano, F.; To, Chun-Hao; Tucker, D. L.; Varga, Tamas Norbert; Wilkinson, Reese D. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    ABSTRACT We present morphological classifications of ∼27 million galaxies from the Dark Energy Survey (DES) Data Release 1 (DR1) using a supervised deep learning algorithm. The classification scheme separates: ...
  • THE Q/U IMAGING EXPERIMENT: POLARIZATION MEASUREMENTS of the GALACTIC PLANE at 43 and 95 GHz 
    Ruud, Tone Melvær; Fuskeland, Unni; Wehus, Ingunn Kathrine; Vidal, M.; Araujo, D.; Bischoff, C.; Buder, I.; Chinone, Y.; Cleary, K.; Dumoulin, R. N.; Kusaka, A.; Monsalve, R.; Næss, Sigurd Kirkevold; Newburgh, L. B.; Reeves, R. A.; Zwart, J. T. L.; Bronfman, L.; Davies, R. D.; Davis, R.; Dickinson, C.; Eriksen, Hans Kristian Kamfjord; Gaier, T.; Gundersen, J. O.; Hasegawa, M.; Hazumi, M.; Huffenberger, K. M.; Jones, M. E.; Lawrence, C. R.; Leitch, E. M.; Limon, M.; Miller, A. D.; Pearson, T. J.; Piccirillo, L.; Radford, S. J. E.; Readhead, A. C. S.; Samtleben, D.; Seiffert, M.; Shepherd, M. C.; Staggs, S. T.; Tajima, O.; Thompson, K. L. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    We present polarization observations of two Galactic plane fields centered on Galactic coordinates (l, b) = (0°, 0°) and (329°, 0°) at both Q (43 GHz) and W bands (95 GHz), covering between 301 and 539 square degrees ...
  • A Quadratic Estimator for Statistical Anisotropy in the Cosmic Microwave Background 
    Saxrud, Svein Rune (Master thesis / Masteroppgave, 2011)
    The standard model of cosmology has proven to be a great success. Through measurements of the Cosmic Microwave Background radiation, cosmologists have been able to constrain parameters such as the age and geometry of the ...
  • Quantifying Properties of Photospheric Magnetic Cancellations in the Quiet Sun Internetwork 
    Ledvina, Vincent E.; Kazachenko, Maria D.; Criscuoli, Serena; Tilipman, Dennis; Ermolli, Ilaria; Falco, Mariachiara; Guglielmino, Salvatore; Jafarzadeh, Shahin; Rouppe van der Voort, Luc; Zuccarello, Francesca (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    We analyzed spectropolarimetric data from the Swedish 1 m Solar Telescope to investigate the physical properties of small-scale magnetic cancellations in the quiet Sun photosphere. Specifically, we looked at the full Stokes ...
  • Quantitative Characterization of Magnetic Flux Rope Properties for Two Solar Eruption Events 
    He, Wen; Hu, Qiang; Jiang, Chaowei; Qiu, Jiong; Prasad, Avijeet (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    In order to bridge the gap between heliospheric and solar observations of coronal mass ejections (CMEs), one of the key steps is to improve the understanding of their corresponding magnetic structures like the magnetic ...
  • Quantized Vortices in Superfluid Dark Matter 
    Mauland, Renate (Master thesis / Masteroppgave, 2019)
    Investigating properties of vortices formed in the superfluid dark matter picture, along with the parameter space of the model.
  • Quiet Sun Center to Limb Variation of the Linear Polarization Observed by CLASP2 Across the Mg ii h and k Lines 
    Rachmeler, Laurel A.; Trujillo Bueno, Javier; McKenzie, D.E.; Ishikawa, R.; Auchère, F.; Kobayashi, K.; Kano, R.; Okamoto, T.J.; Bethge, C.W.; Song, D.; Alsina Ballester, E.; Belluzzi, L.; del Pino Alemán, T.; Asenio Ramos, A.; Yoshida, M.; Shimizu, T.; Winebarger, A.; Kobelski, A.R.; Vigil, G.D.; De Pontieu, Bart Walter; Narukage, N.; Kubo, M.; Sakao, T.; Hara, H.; Suematsu, Y.; Štěpán, J.; Carlsson, Mats; Leenaarts, Jorrit (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Abstract The CLASP2 (Chromospheric LAyer Spectro-Polarimeter 2) sounding rocket mission was launched on 2019 April 11. CLASP2 measured the four Stokes parameters of the Mg ii h and k spectral region ...
  • Quiet Sun flux rope formation via incomplete Taylor relaxation 
    Robinson, Rebecca Anne; Aulanier, Guillaume; Carlsson, Mats (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Context. Low-altitude nanoflares are among the candidates for atmospheric heating in the quiet Sun’s corona. Low-altitude twisted magnetic fields may be involved in such events, as they are in larger flares. But for ...