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(Doctoral thesis / Doktoravhandling, 2024)
Magnetic reconnection is a fundamental mechanism in astrophysics and a promising candidate for solving the coronal heating problem. This process has been shown to produce a variety of different observable phenomena on the ...
(Master thesis / Hovedoppgave, 2007)
The goals of this thesis are to provide a general introduction to CMB fundamentals, give an overview of non-Gaussianity analysis, and to compare the sensitivities of a selection of tests (Minkowski functionals, skeleton ...
(Master thesis / Masteroppgave, 2012)
The Q/U-Imaging ExperimenT (QUIET) is a ground-based coherent polarimeter experiment, primarily targeting the detection of low-l B-mode polarization in the CMB. Such modes are a signature of primordial tensor perturbations, ...
(Master thesis / Hovedoppgave, 2002)
Five years (1992-1997, ~2650 images) of optical observations of the
gravitational lens system QSO 0957+561 were analyzed using a new
photometry package developed by Jan Teuber and me. My supervisor was
Prof. Rolf Stabell, ...
(Master thesis / Masteroppgave, 2010)
The solar chromosphere is a region where the thermodynamics are out of equilibrium, and realistic values of temperature and electron densities here are difficult to obtain. Hydrogen, being the most abundant element in solar ...
(Master thesis / Masteroppgave, 2008)
In-situ observations together with spectroscopic measurements show that the elemental abundance in the solar atmosphere varies from the photosphere to solar wind.
An enrichment for low First Ionisation Potential elements ...
(Master thesis / Masteroppgave, 2008)
The solar chromosphere has previously been thought to be a homogenic layer of the solar atmosphere, but better observations have made it evident that the chromosphere is a highly dynamic area.
Spicules are structures ...
(Master thesis / Masteroppgave, 2007)
Gravitational lensing has played an important role in cosmology since the discovery of the first gravitational lensing system in 1979 (Walsh et al.), where the quasar QSO 0957+561 can be seen in two images. Such multiple ...
(Master thesis / Masteroppgave, 2009)
The cosmic microwave background (CMB) radiation at 2.7 K is the leftover radiation from the Big Bang.
By studying this radiation we can extract much information about the universe we live in.
CMB experiments over the last ...
(Master thesis / Masteroppgave, 2008)
Observations of how matter is distributed on different length scales in the universe are an important test of cosmological models. For example, such observations can give an upper limit for the mass of neutrinos: As the ...