Now showing items 94-113 of 517

  • Llinares, Claudio; Pogosian, Levon (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
    We study properties of domain walls in the symmetron model, in which the scalar gravitational degree of freedom decouples from matter in regions of high density and exhibits a spontaneously broken Z2 symmetry at low ...
  • Emblemsvåg, Geir (Master thesis / Hovedoppgave, 2007)
  • Cristaldi, A.; Guglielmino, S. L.; Zuccarello, F.; Romano, P.; Falco, M.; Rouppe, Van Der Voort Luc; de la Cruz Rodriguez, Jaime; Ermolli, I.; Criscuoli, S. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
    Delta (δ) spots are complex magnetic configurations of sunspots characterized by umbrae of opposite polarity sharing a common penumbra. In order to investigate the fine structure of the region separating the two magnetic ...
  • Masset, F.S.; Velasco Romero, D.A.; Eklund, Lars Henrik (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    A massive and luminous perturber moving across an opaque gas is subjected to a force different from the gravitational friction that it would experience if it were cold. The heat released by the perturber diffuses in the ...
  • Vissers, Gregal Joan Maria (Doctoral thesis / Doktoravhandling, 2013)
    This thesis presents an observational study of the dynamics of fine structure in the (mostly lower) atmosphere of solar active regions. The considered phenomena – Ellerman bombs, flocculent flows and coronal rain – are ...
  • Mooroogen, K.; Morton, R. J.; de Jorge Henriques, Vasco Manuel (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    Aims. Current observational instruments are now providing data with the necessary temporal and spatial cadences required to examine highly dynamic, fine-scale magnetic structures in the solar atmosphere. Using the spectroscopic ...
  • Carlesi, Edoardo; Mota, David; Winther, Hans Arnold (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    In this work, we study the dynamics of the Local Group (LG) within the context of cosmological models beyond General Relativity (GR). Using observable kinematic quantities to identify candidate pairs, we build up samples ...
  • Verde, Licia; Bellini, Emilio; Pigozzo, Cassio; Heavens, Alan F.; Jimenez, Raul (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2017)
    We investigate our knowledge of early universe cosmology by exploring how much additional energy density can be placed in different components beyond those in the ΛCDM model. To do this we use a method to separate early- ...
  • Hodzic, Vedad (Master thesis / Masteroppgave, 2017)
    The Next Generation Transit Survey (NGTS) is an ongoing wide-field exoplanet transit survey at ESO Paranal Observatory, Chile. It is searching for Neptune and super-Earth size planets around nearby stars using 12 robotic ...
  • Falck, Bridget Lynn; McCullagh, N.; Neyrinck, M. C.; Wang, J.; Szalay, A. S. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    © 2017. The American Astronomical Society. All rights reserved.
  • Tangvald, Anders (Master thesis / Masteroppgave, 2008)
    Observations of the Cosmic Microwave Background is impaired by other astrophysical sources that also radiate in the microwave spectrum. These other, non-CMB sources are known as foregrounds. In this thesis, three different ...
  • Leenaarts, Jorrit; de la Cruz Rodriguez, Jaime; Kochukhov, Oleg; Carlsson, Mats (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
    The Ca II 854.2 nm spectral line is a common diagnostic of the solar chromosphere. The average line profile shows an asymmetric core, and its bisector shows a characteristic inverse-C shape. The line actually consists of ...
  • Yang, Weiqiang; Pan, Supriya; Xu, Lixin; Mota, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    We study a novel interacting dark energy − dark matter scenario where the anisotropic stress of the large-scale inhomogeneities is considered. The dark energy has a constant equation of state and the interaction model ...
  • Yang, Weiqiang; Nunes, Rafael C.; Pan, Supriya; Mota, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    © 2017 American Physical Society
  • Pereira, Tiago Mendes Domingos; De Pontieu, Bart; Carlsson, Mats (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
    Spicules have been observed on the Sun for more than a century, typically in chromospheric lines such as Hα and Ca II H. Recent work has shown that so-called "type II" spicules may have a role in providing mass to the ...
  • Hansteen, Viggo; Ortiz, Ada; Archontis, Vasilis; Carlsson, Mats; Mendes Domingos Pereira, Tiago; Bjørgen, Johan Pires (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Context: Ellerman bombs (EBs), observed in the photospheric wings of the Hα line, and UV bursts, observed in the transition region Si IV line, are both brightenings related to flux emergence regions and specifically to ...
  • Vissers, Gregal Joan Maria; Rouppe, Van Der Voort Luc; Rutten, Robert; Carlsson, Mats; De Pontieu, Bart Walter (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    Ellerman bombs (EBs) are transient brightenings of the extended wings of the solar Balmer lines in emerging active regions. We describe their properties in the ultraviolet lines sampled by the Interface Region Imaging ...
  • Rutten, Robert; Rouppe, Van Der Voort Luc; Vissers, Gregal Joan Maria (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    Ellerman bombs are transient brightenings of the wings of the solar Balmer lines that mark reconnection in the photosphere. Ellerman noted in 1917 that he did not observe such brightenings in the Na i D and Mg i b lines. ...
  • Ortiz, Ada; Bellot Rubio, L. R.; Hansteen, Viggo; de la Cruz Rodriguez, Jaime; Rouppe, Van Der Voort Luc (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
    We study a granular-sized magnetic flux emergence event that occurred in NOAA 11024 in 2009 July. The observations were made with the CRISP spectropolarimeter at the Swedish 1 m Solar Telescope achieving a spatial resolution ...
  • de la Cruz Rodriguez, Jaime; Hansteen, Viggo; Bellot-Rubio, Luis; Ortiz, Ada (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    Magnetic flux emergence into the outer layers of the Sun is a fundamental mechanism for releasing energy into the chromosphere and the corona. In this paper, we study the emergence of granular-sized flux concentrations and ...