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(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- ...
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(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 ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)© 2017. The American Astronomical Society. All rights reserved.
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)Context. The mechanism(s) behind coronal heating still elude(s) direct observation and modelling of viable theoretical processes and the subsequent effect on coronal structures is one of the key tools available to assess ...
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(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 ...
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(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 ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)We study the effect of the cubic torus topology of the Universe on scalar cosmological perturbations which define the gravitational potential. We obtain three alternative forms of the solution for both the gravitational ...
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(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 ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)© 2017 American Physical Society
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)Context. Small-scale processes are thought to be important for the dynamics of the solar atmosphere. While numerical resolution fundamentally limits their inclusion in magnetohydronamic (MHD) simulations, real observations ...
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(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 ...
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(Master thesis / Masteroppgave, 2021)
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)The emergence of magnetic flux through the photosphere and into the outer solar atmosphere produces, amongst other dynamical phenomena, Ellerman bombs (EBs), which are observed in the wings of Hα and are due to magnetic ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)The emergence of magnetic flux through the photosphere and into the outer solar atmosphere produces, amongst other dynamical phenomena, Ellerman bombs (EBs), which are observed in the wings of Hα and are due to magnetic ...
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(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 ...
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(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 ...
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(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. ...
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(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 ...
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(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 ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)We study, for the first time, the ascent of granular-sized magnetic bubbles from the solar photosphere through the chromosphere into the transition region and above. Such events occurred in a flux emerging region in NOAA ...