• Daedalus: A low-flying spacecraft for in situ exploration of the lower thermosphere-ionosphere 

      Sarris, Theodoros E.; Talaat, Elsayed R.; Palmroth, Minna; Dandouras, Iannis; Armandillo, Errico; Kervalishvili, Guram; Buchert, S. C.; Tourgaidis, Stylianos; Malaspina, David; Jaynes, Allison N.; Paschalidis, Nikolaos; Sample, John; Halekas, Jasper; Doornbos, Eelco; Lappas, Vaios; Moretto, Therese; Stolle, Claudia; Clilverd, Mark; Wu, Qian; Sandberg, Ingmar; Pirnaris, Panagiotis; Aikio, Anita (Journal article; Peer reviewed, 2020)
      The Daedalus mission has been proposed to the European Space Agency (ESA) in response to the call for ideas for the Earth Observation program's 10th Earth Explorer. It was selected in 2018 as one of three candidates for a ...
    • Dark matter and fundamental physics with the Cherenkov Telescope Array 

      Doro, M; Conrad, J.; Emmanoulopoulos, D.; Sanchez-Conde, M.A.; Barrio, JA; Birsin, E.; Bolmont, J.; Brun, P.; Colafrancesco, S.; Connell, S.H.; Contreras, JL; Daniel, M.K.; Fornasa, M.; Gaug, M.; Glicenstein, J.F.; Gonzalez-Munoz, A.; Hassan, T; Horns, D.; Jacholkowska, A; Jahn, C.; Mazini, R; Mirabal, N.; Moralejo, A; Moulin, E.; Nieto, D; Ripken, J.; Sandaker, Heidi; Schwanke, U; Spengler, G.; Stamerra, A; Viana, A.; Zechlin, H.S.; Zimmer, S. (Peer reviewed; Journal article, 2013-03)
      The Cherenkov Telescope Array (CTA) is a project for a next-generation observatory for very high energy (GeV–TeV) ground-based gamma-ray astronomy, currently in its design phase, and foreseen to be operative a few years ...
    • Dark matter in a CP-violating three-Higgs-doublet model with S3 symmetry 

      Kuncinas, Anton; Øgreid, Odd Magne; Osland, Per; Rebelo, Margarida N. (Journal article; Peer reviewed, 2022)
      In spite of the success of the Standard Model of particle physics, there are some theoretical predictions which are not yet fully established experimentally, as well as some experimental observations which cannot be fitted ...
    • Dark matter in three-Higgs-doublet models with S3 symmetry 

      Khater, W.; Kunčinas, A.; Øgreid, Odd Magne; Osland, Per; Rebelo, M.N. (Journal article; Peer reviewed, 2022)
      Models with two or more scalar doublets with discrete or global symmetries can have vacua with vanishing vacuum expectation values in the bases where symmetries are imposed. If a suitable symmetry stabilises such vacua, ...
    • Dark Matter Searches with ATLAS and Fermi 

      Morå, Knut Dundas (Master thesis, 2013-06-03)
      This thesis presents Dark matter inspired searches for supersymmetry with a one-tau analysis at ATLAS, which excludes a region close to that of allowed dark matter densities at m_0 ~ 400 GeV, m_1/2 ~ 600 GeV, tan \beta = ...
    • Dawn-dusk asymmetries in the coupled solar wind-magnetosphere-ionosphere system: a review 

      Walsh, Andrew P.; Haaland, Stein; Forsyth, Colin; Keesee, Amy M.; Kissinger, Jennifer; Li, Kun; Runov, Andrei; Soucek, Josef; Walsh, Brian M.; Wing, Simon; Taylor, Matthew G.G.T. (Peer reviewed; Journal article, 2014-07-01)
      Dawn–dusk asymmetries are ubiquitous features of the coupled solar-wind–magnetosphere–ionosphere system. During the last decades, increasing availability of satellite and ground-based measurements has made it possible to ...
    • Dayside and nightside magnetic field responses at 780 km altitude to dayside reconnection 

      Snekvik, Kristian; Østgaard, Nikolai; Tenfjord, Paul; Reistad, Jone Peter; Laundal, Karl Magnus; Milan, Stephen Eric; Haaland, Stein (Peer reviewed; Journal article, 2017-02)
      During southward interplanetary magnetic field, dayside reconnection will drive the Dungey cycle in the magnetosphere, which is manifested as a two‐cell convection pattern in the ionosphere. We address the response of the ...
    • Dayside Field-Aligned Current Impacts on Ionospheric Irregularities 

      Follestad, Anna Kristine Fæhn; Herlingshaw, Katie; Ghadjari, Hossein; Knudsen, David J.; McWilliams, Kathryn A.; Moen, Jøran Idar; Spicher, Andres; Wu, Jingjing; Oksavik, Kjellmar (Journal article; Peer reviewed, 2020)
      Global Navigation Satellite Systems (GNSS) are subject to disturbances caused by plasma irregularities in the ionosphere. Studies have suggested that in addition to the gradient drift and Kelvin‐Helmholtz instabilities, ...
    • Dayside Transient Phenomena and Their Impact on the Magnetosphere and Ionosphere 

      Zhang, Hui; Zong, Qiugang; Connor, Hyunju; Delamere, Peter; Facskó, Gábor; Han, Desheng; Hasegawa, Hiroshi; Kallio, Esa; Kis, Árpád; Le, Guan; Lembège, Bertrand; Lin, Yu; Liu, Terry; Oksavik, Kjellmar; Omidi, Nojan; Otto, Antonius; Ren, Jie; Shi, Quanqi; Sibeck, David; Yao, Shutao (Journal article; Peer reviewed, 2022)
      Dayside transients, such as hot flow anomalies, foreshock bubbles, magnetosheath jets, flux transfer events, and surface waves, are frequently observed upstream from the bow shock, in the magnetosheath, and at the magnetopause. ...
    • Deciphering Spatio-Temporal Variations in the Auroral Ionosphere using Magnetometer Data 

      Walker, Simon James (Doctoral thesis, 2024-03-22)
      Den polare ionosfæren er et dynamisk plasma-miljø dominert av koblingen mellom solvinden og jordens magnetosfære. Nordlyset, plasma-bevegelsen og elektriske strømmer i ionosfæren er skalert og drevet av dagsidekoblingen ...
    • Decontamination of persistent organic pollutants in fishmeal and fish oil. Process optimization and modeling 

      Oterhals, Åge (Doctoral thesis, 2011-10-07)
      Persistent organic pollutants (POPs) are fat soluble chemical substances that persist in the environment and bioaccumulate in the food chain. Through long-range environmental transportation by air, water and migratory ...
    • Deep learning jet modifications in heavy-ion collisions 

      Du, Yi-lun; Pablos Alfonso, Daniel; Tywoniuk, Konrad (Journal article; Peer reviewed, 2021)
      Jet interactions in a hot QCD medium created in heavy-ion collisions are conventionally assessed by measuring the modification of the distributions of jet observables with respect to the proton-proton baseline. However, ...
    • Defect detection and acoustic penetration of grout in offshore structures 

      Fjellheim, Mats Johan (Master thesis, 2023-08-31)
    • Demonstrating the potential of CO2 hydrate self-sealing in Svalbard, Arctic Norway 

      Almenningen, Stian; Hussain, Arif; Betlem, Peter; Roy, Srikumar; Senger, Kim; Ersland, Geir (Peer reviewed; Journal article, 2019-10)
      Here we report the potential self-sealing properties of CO2 hydrate for the Longyearbyen CO2 Lab’s shallow aquifer in Svalbard, Arctic Norway, through hydrate formation experiments. The experiments were conducted on a 9 cm ...
    • The Dependence of Cold and Hot Patches on Local Plasma Transport and Particle Precipitation in Northern Hemisphere Winter 

      Zhang, Duan; Zhang, Qing-He; Ma, Y.-Z.; Oksavik, Kjellmar; Lyons, L.R.; Xing, Zan-Yang; Hairston, Marc; Deng, Z.-X.; Liu, J.-J. (Journal article; Peer reviewed, 2022)
      By using a database of 4,634 cold patches (high density and low electron temperature) and 4,700 hot patches (high density and high electron temperature) from Defense Meteorological Satellite Program F16 in 2005–2018 winter ...
    • Dependence of Sudden Stratospheric Warmings on Internal and External Drivers 

      Salminen, Antti; Asikainen, T.; Maliniemi, Ville Aleksi; Mursula, K. (Journal article; Peer reviewed, 2020)
      A sudden stratospheric warming (SSW) is a large-scale disturbance of the wintertime stratosphere, which occurs especially in the Northern Hemisphere. Earlier studies have shown that SSW occurrence depends on atmospheric ...
    • Dependence of the global dayside reconnection rate on interplanetary magnetic field By and the earth’s dipole tilt 

      Reistad, Jone Peter; Holappa, Lauri; Ohma, Anders; Gabrielse, Christine; Sur, Dibyendu; Asikainen, Timo; DeJong, Anna (Journal article; Peer reviewed, 2022)
      In the recent years, significant attention has been given to the combined effect of Interplanetary Magnetic Field (IMF) duskward component (By) and dipole tilt on the global magnetosphere-ionosphere system response. Numerous ...
    • Design and Development of the SMILE SXI Radiation Shutter Control System 

      Lylund, Ove (Master thesis, 2018-06-19)
      This thesis concerns the design, implementation, testing and verification of the radiation shutter control system, an embedded, microcontroller-based system, to be used in the Solar Wind Magnetosphere Ionosphere Link ...
    • Design and Implementation of a High-Speed Readout and Control System for a Digital Tracking Calorimeter for proton CT 

      Grøttvik, Ola Slettevoll (Doctoral thesis, 2021-02-18)
      Particle therapy, a non-invasive technique for treating cancer using protons and light ions, has become more and more common. For example, a particle treatment facility is currently being built, in Bergen, Norway. Proton ...