Browsing Institutt for teoretisk astrofysikk by Title
Now showing items 1043-1062 of 1279
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)Sunspot chromospheres display vigorous oscillatory signatures when observed using chromospheric diagnostics such as the strong Ca II lines and Hα. New high-resolution sunspot observations from the Swedish 1 m Solar Telescope ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
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(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 ...
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(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 ...
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(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 ...
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(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 ...
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(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 ...
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(Master thesis / Masteroppgave, 2023)
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(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 ...
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(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 ...
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(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 ...
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(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 ...
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(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 ...
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(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 ...
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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, 2017)© 2017. The American Astronomical Society. All rights reserved.
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(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 ...
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(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 ...
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(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, ...
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(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 ...