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Investigation of Polar Mesospheric Summer Echoes observed with the EISCAT VHF radar
(Master thesis, 2025)During the summer months at high and mid-latitudes, VHF and UHF radars can detect strong radar echoes, known as Polar Mesospheric Summer Echoes (PMSE), at altitudes between 80 and 90 km. The formation of PMSE is closely linked to the presence of ice particles, turbulence, and irregularities in the electron density. Current theories suggest that neutral turbulence causes the spatial structuring of ... -
Numerical simulations of sheath-interchange turbulence at the boundary of magnetically confined plasmas
(Master thesis, 2025)Controlled thermonuclear fusion holds great potential as an abundant, safe and environmentally friendly source of electrical energy. One of the most promising approach to harness fusion energy is trough the use of tokamak, a machine with a strong toroidal magnetic field. However the intrinsic curvature of the tokamak leads to an interchange instability, akin to the Rayleigh Taylor instability, in ... -
Variability of Circulation and Water Masses in Kvitøya Trough
(Master thesis, 2025)The physical environment of the northern Barents Sea is shaped by the inflow of warm, saline Atlantic Water (AW) and the seasonal cycle of sea ice. Recent years have seen a rapid shift toward more Atlantic conditions, driven by reduced sea ice import and increased influence of AW intrusions. Although seasonal variability is crucial for understanding these changes, observations from the ice-covered ... -
Comparison between high-resolution large-eddy simulation (LES) of atmospheric flows and the WindNinja wind downscaling algorithm, emphasizing Lagrangian coherent structures to enhance predictions for snow redistribution in alpine environments.
(Master thesis, 2025)Avalanche forecasters, hydrologists and winter recreationalists are asking themselves the same question: where is the snow on the mountain. Unfortunately, snow distribution is a highly complex area of research due to the turbulent behavior of atmospheric flow. The structural organization of the flow can be analyzed via Lagragian coherent structure (LCS) methods, such as finite-time Lyapunov exponents ... -
Geological Investigation of the Polaris CO₂ Storage Prospect in the Barents Sea
(Master thesis, 2025)This thesis investigates the Polaris prospect in the southwestern Barents Sea as a potential site for geological CO₂ storage. The study’s objectives were to (1) map the storage complex, (2) assess reservoir and seal suitability, (3) estimate storage capacity, and (4) evaluate leakage potential through the regional fault system. To achieve this, 3D seismic data were interpreted in Petrel alongside ... -
Fragmentation and Volatile Depletion in Meteor Head Echo Measurements
(Master thesis, 2025)The main source of mass influx to Earth is thought to come from microgram sized meteoroids. These micro-meteoroids are indirectly detectable by high powered large aperture radars through the plasma they generate while ablating. A subset of meteor head echoes is known to contain abrupt drops in radar cross section (RCS). These drops can indicate meteor fragmentation, depletion of volatile elements, ... -
Presisjons fotometri ved Skibotn observatorium
(Master thesis; Mastergradsoppgave, 1996-12-17)Denne oppgaven viser at det er mulig å gjøre differensiell fotometri av ∂-Scuti stjerner med rimelig god presisjon ved Skibotn observatorium. Den høyeste presisjonen som ble oppnådd i C1-C2 var 28 mmag. Sammenligningen av den beste natten fra Skibotn med en god natt fra FG Vir kampanjen (året før) viser at muligheten er til stede for å oppnå gode resultater. En bekreftelse på dette fikk vi da to av ... -
Stellar CCD Photometry in the Auroral Zone
(Master thesis; Mastergradsoppgave, 2000-12)Observing pulsating stars in the auroral zone, seemed for many years to be an impossible task. Due to the aurora, the sky is bright and rapidly changing. Precise photometry could only be performed on stars down to 7 th. magnitude.<p> <p>A new instrument for continuous photometry, with the use of CCD technology, and windowed readout, is developed by the Astrophysics group at the University of ... -
Seasonal and interannual variability in hydrography and currents along the Nansen Legacy transect across the Barents Sea
(Master thesis; Mastergradsoppgave, 2023-12-20)The Barents Sea is an Arctic shelf sea that is an important site forwater mass formation and transformation. It is characterized by interactions between Atlanticand Arctic-originWaters, and by strong seasonality in terms of alternating atmospheric and sea-ice conditions throughout the year. How these aspects impact the seasonal evolution of the water column properties is yet to be fully ... -
Offshore Wind Prediction with Graph Neural Networks
(Mastergradsoppgave; Master thesis, 2024-06-14)Offshore wind energy, especially in regions like the Norwegian Arctic, is a promising source of renewable energy. Graph Neural Networks (GNNs) have shown potential in modeling complex systems like weather, making them suitable for improving wind resource assessments. This thesis investigates the use of GNNs for predicting offshore wind patterns, utilizing high-resolution Synthetic Aperture Radar ... -
Recent Changes in Mid-latitude Wave Propagation
(Mastergradsoppgave; Master thesis, 2024-06-12)In recent years climate change in the polar areas has attracted a lot of attention. Not only for its consequences in polar areas, but also for its possible effects on lower latitudes. A reduced temperature gradient between the polar areas is expected to weaken the mid-latitude jet stream. This weaker jet stream is hypothesised to lead to a reduction in the propagation velocity of atmospheric Rossby ... -
Wind resource assessment using LiDAR
(Mastergradsoppgave; Master thesis, 2024-06-07)This thesis presents a comprehensive wind resource assessment for the expansion of the Fakken wind park in Norway, leveraging Light Detection and Ranging (LiDAR) technology. The measurement campaign conducted from December 2022 to June 2023, aims to detail LiDAR measurement methodologies, analyze collected data, and estimate wind energy production. -
The Role of Clouds in Arctic Climate
(Mastergradsoppgave; Master thesis, 2024-05-14)Anthropogenic climate change is causing the Arctic to warm faster than any other region on Earth, a phenomenon also known as Arctic amplification. The warming and its consequences induce, amongst other things, a change in clouds, impacting their role in the Arctic climate by introducing a feedback. Clouds play an important role in the global radiation budget. They cool the surface by reflecting ... -
Analyzing the Impact of Peak-Shaving on Load Reduction and on Battery Energy Storage System Degradation: A Simulation-Based Study in Husøy
(Mastergradsoppgave; Master thesis, 2023-11-14)The island of Husøy, in Northern Senja, Norway, faces numerous voltage quality difficulties, which arise from the consequent surge in electricity demand by the local growing fishing industry. Collaborating with the local distribution system operator (DSO), Arva, the current study explores the implementation of Battery Energy Storage Systems (BESS) using a peak-shaving strategy to alleviate high-demand ... -
Effects of subglacial meltwater runoff on the ocean circulation beneath the Filchner Ice Shelf
(Mastergradsoppgave; Master thesis, 2023-06-15)Antarctic ice shelves, by restraining ice streams and affecting the discharge of grounded ice, play a critical role in the mass balance of the Antarctic ice sheet. In this study, sub-ice shelf CTD measurements and time series data from an ice shelf cavity mooring were used to detect subglacial runoff beneath the Filchner Ice Shelf. CTD measurements from four boreholes across the southern Filchner ... -
On the Linkage Between Rossby Waves and Heatwaves
(Mastergradsoppgave; Master thesis, 2023-05-14)This thesis examines the relationship between upper-level atmospheric circulation and heatwaves. We studied the role of planetary Rossby waves in the observed increase in intensity, frequency, and duration of extreme temperature events in the mid-latitudes. Focusing on the summer season, we tested the proposed hypothesis that links recent changes in the Rossby wave amplitudes and propagation speed ... -
Oceanographic variability and change in two fjords in northern Norway
(Mastergradsoppgave; Master thesis, 2023-06-01)Long-term hydrographic time series data from two fixed stations in the northern Norwegian fjords Malangen and Balsfjorden from the period 1980 - 2022 have been examined. The data have been supplemented with model results from the ocean model NorFjords160 over the period April 1st 2017 to December 31st 2022. To gain a deeper understanding of the oceanographic variability and change, the environmental ... -
Conditional averaging of overlapping pulses
(Mastergradsoppgave; Master thesis, 2023-05-15)Conditional averaging is a signal processing method used to study turbulent fluctuations in a variety of fields. The method, in its simplest form, works by finding peaks in a signal that fulfill a certain size threshold. Equally sized excerpts of the signal around every peak are then cut out and averaged. This yields the average shape of the events that fulfill the condition. Based on the peak ... -
A comparative study of lens-less and lens-based optical imaging using full electric field analysis
(Mastergradsoppgave; Master thesis, 2021-05-13)The focus of this thesis is to investigate the feasibility of a lens-less label-free microscope system, and compare this with a conventional lens-based microscope. The imaging performance of conventional microscopes are greatly dependent on the objective lens, due to their inherent physical space constraint and spherical aberrations. We, therefore, will investigate the conceptual feasibility of a ... -
Raman-spectroscopy and of optically trapped nanoparticles
(Mastergradsoppgave; Master thesis, 2022-11-06)The present work begins a large layer of experiments on the study of Raman radiation from extracellular vesicles. It is a promising method that provides unique information about the global biomolecular composition of a single vesicle or a small number of vesicles. Two physical phenomena are present in this work, Raman scattering and optical trapping. In Raman scattering, the scattered radiation ...
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