Now showing items 1809-1828 of 2098

    • Seasonal and hemispheric asymmetries of F‐region polar cap plasma density: Swarm and CHAMP observations 

      Hatch, Spencer Mark; Haaland, Stein; Laundal, Karl Magnus; Moretto, Therese; Yau, Andrew; Bjoland, Lindis Merete; Reistad, Jone Peter; Ohma, Anders; Oksavik, Kjellmar (Journal article; Peer reviewed, 2020)
      One of the primary mechanisms of loss of Earth's atmosphere is the persistent “cold” ( urn:x-wiley:jgra:media:jgra56068:jgra56068-math-0001 20 eV) ion outflow that has been observed in the magnetospheric lobes over large ...
    • Seasonal and Solar Cycle Variations of Thermally Excited 630.0 nm Emissions in the Polar Ionosphere 

      Kwagala, Norah Kaggwa; Oksavik, Kjellmar; Lorentzen, Dag Arne; Johnsen, Magnar Gullikstad; Laundal, Karl Magnus (Peer reviewed; Journal article, 2018-08)
      Solar cycle and seasonal variations have been found in the occurrence of strong thermally excited 630.0 nm emissions in the polar ionosphere. Measurements from the European Incoherent Scatter Svalbard Radar have been used ...
    • Seasonality and drivers of water column optical properties on the northwestern Barents Sea shelf 

      Sandven, Håkon; Hamre, Børge; Petit, Tristan; Röttgers, Rudiger; Liu, Hongbo; Granskog, Mats (Journal article; Peer reviewed, 2023)
      Hydrographic and bio-optical measurements were conducted along a south–north transect on the northwestern Barents Sea shelf from early spring to late summer in 2021. Strong climate change manifestations observed in this ...
    • The Second AGILE MCAL Gamma-Ray Burst Catalog: 13 yr of Observations 

      Ursi, A.; Romani, M.; Verrecchia, F.; Pittori, C.; Tavani, M.; Marisaldi, Martino; Galli, M.; Labanti, C.; Parmiggiani, N.; Bulgarelli, A.; Addis, A.; Baroncelli, L.; Cardillo, M.; Casentini, C.; Cattaneo, P.W.; Chen, A.; Di Piano, Piano; Fuschino, F.; Longo, F.; Lucarelli, F.; Morselli, A.; Piano, G.; Vercellone, S. (Journal article; Peer reviewed, 2022)
      We present the results of a systematic search and analysis of GRBs detected by the Astrorivelatore Gamma ad Immagini LEggero (AGILE) MiniCALorimeter (MCAL; 0.4–100 MeV) over a time frame of 13 yr, from 2007 to 2020 November. ...
    • The Second Catalog of Interplanetary Network Localizations of Konus Short-duration Gamma-Ray Bursts 

      Svinkin, D.S.; Hurley, K.; Ridnaia, A.V.; Lysenko, A.L.; Frederiks, D.D.; Golenetskii, S.V.; Tsvetkova, A.E.; Ulanov, M.V.; Kokomov, A.; Cline, T.L.; Mitrofanov, I.; Golovin, D.; Kozyrev, A.; Litvak, M.; Sanin, A.; Goldstein, A.; Briggs, M.S.; Wilson-Hodge, C.; Burns, E.; Von Kienlin, Kienlin; Zhang, X.-L.; Rau, A.; Savchenko, V.; Bozzo, E.; Ferrigno, C.; Barthelmy, S.; Cummings, J.; Krimm, H.; Palmer, D.M.; Tohuvavohu, A.; Yamaoka, K.; Ohno, M.; Fukazawa, Y.; Hanabata, Y.; Takahashi, T.; Tashiro, M.; Terada, Y.; Murakami, T.; Makishima, K.; Boynton, W.; Fellows, C.W.; Harshman, K.P.; Enos, H.; Starr, R.; Goldsten, J.; Gold, R.; Ursi, A.; Tavani, M.; Bulgarelli, A.; Casentini, C.; Del Monte, Monte; Evangelista, Y.; Galli, M.; Longo, F.; Marisaldi, Martino; Parmiggiani, N.; Pittori, C.; Romani, M.; Verrecchia, F.; Smith, D.M.; Hajdas, W.; Xiao, S.; Cai, C.; Yi, Q.B.; Zhang, Y.Q.; Xiong, S.L.; Li, X.B.; Huang, Y.; Li, C.K.; Zhang, S.N.; Song, L.M.; Liu, C.Z.; Li, X.Q.; Peng, W.X.; Martinez-Castellanos, I. (Journal article; Peer reviewed, 2022)
      We present the catalog of InterPlanetary Network (IPN) localizations for 199 short-duration gamma-ray bursts (sGRBs) detected by the Konus-Wind (KW) experiment between 2011 January 1 and 2021 August 31, which extends the ...
    • The seeding of ice algal blooms in Arctic pack ice: The multiyear ice seed repository hypothesis 

      Olsen, Lasse Mork; Laney, Samuel R.; Duarte, Pedro; Kauko, Hanna M.; Fernández-Méndez, Mar; Mundy, Christopher John; Rösel, Anja; Meyer, Amelie; Itkin, Polona; Cohen, Lana; Peeken, Ilka; Tatarek, Agnieszka; Róźańska-Pluta, Magdalena; Wiktor, Josef; Taskjelle, Torbjørn; Pavlov, Alexey; Hudson, Stephen R.; Granskog, Mats A.; Hop, Haakon; Assmy, Philipp (Peer reviewed; Journal article, 2017-07)
      During the Norwegian young sea ICE expedition (N-ICE2015) from January to June 2015 the pack ice in the Arctic Ocean north of Svalbard was studied during four drifts between 83° and 80°N. This pack ice consisted of a mix ...
    • A seismic field test with a Low level Acoustic Combustion Source and Pseudo Noise codes 

      Askeland, Bjørn; Ruud, Bent; Hobæk, Halvor; Mjelde, Rolf (Journal article, 2007-01-20)
      The Low level Acoustic Combustion Source (LACS) is a new type of pulsed underwater acoustic source with an output level of 0.5-1.0 barm peak to peak. The source is based on a combustion engine and intended for shallow ...
    • The self-discharging of supercapacitors interpreted in terms of a distribution of rate constants 

      Helseth, Lars Egil (Journal article; Peer reviewed, 2021)
      Supercapacitors are prone to self-discharging, which is most often measured as a voltage decrease with time under open circuit conditions. It is of substantial interest to find simple and general methods to extract information ...
    • Semirelativistic Schrödinger Equation for Relativistic Laser-Matter Interactions 

      Kjellsson Lindblom, Tor; Førre, Morten; Lindroth, Eva; Selstø, Sølve (Peer reviewed; Journal article, 2018-12)
      A semirelativistic formulation of light-matter interaction is derived using the so called propagation gauge and the relativistic mass shift. We show that relativistic effects induced by a superintense laser field can, to ...
    • Separation and quantification of ionospheric convection sources: 1. A new technique 

      Reistad, Jone Peter; Laundal, Karl Magnus; Østgaard, Nikolai; Ohma, Anders; Haaland, Stein; Oksavik, Kjellmar; Milan, Stephen Eric (Peer reviewed; Journal article, 2019-07-04)
      This paper describes a novel technique that allows separation and quantification of different sources of convection in the high‐latitude ionosphere. To represent the ionospheric convection electric field, we use the Spherical ...
    • Separation and quantification of ionospheric convection sources: 2. The dipole tilt angle influence on reverse convection cells during northward IMF 

      Reistad, Jone Peter; Laundal, Karl Magnus; Østgaard, Nikolai; Ohma, Anders; Thomas, Evan G.; Haaland, Stein; Oksavik, Kjellmar; Milan, Stephen Eric (Peer reviewed; Journal article, 2019-07-04)
      This paper investigates the influence of Earth's dipole tilt angle on the reverse convection cells (sometimes referred to as lobe cells) in the Northern Hemisphere ionosphere during northward IMF, which we relate to ...
    • A setup for electrical tests of ATLAS SCT barrel modules 

      Øye, Ola Kristoffer (Master thesis, 2003)
      The ATLAS SemiConductor Tracker (SCT) is part of the inner detector in the ATLAS detector at the LHC complex at CERN. SCT will consist of a system of silicon strip detectors with digital readout, reading out space point ...
    • A setup for electronic tests of ATLAS silicon strip detectors 

      Pommeresche, Bjørn (Master thesis, 2001)
    • Severe and localized GNSS scintillation at the poleward edge of the nightside auroral oval during intense substorm aurora 

      van der Meeren, Christer; Oksavik, Kjellmar; Lorentzen, Dag Arne; Rietveld, Michael T.; Clausen, Lasse Boy Novock (Peer reviewed; Journal article, 2015-12)
      In this paper we study how GPS, GLONASS, and Galileo navigation signals are compromised by strong irregularities causing severe phase scintillation (σϕ>1) in the nightside high-latitude ionosphere during a substorm on 3 ...
    • Signal estimation in on/off measurements including event-by-event variables 

      D'Amico, Giacomo; Terzić, T.; Strišković, J.; Doro, M.; Strzys, M.; van Scherpenberg, J. (Journal article; Peer reviewed, 2021)
      Signal estimation in the presence of background noise is a common problem in several scientific disciplines. An “on/off” measurement is performed when the background itself is not known, being estimated from a background ...
    • Signal mixture estimation for degenerate heavy Higgses using a deep neural network 

      Kvellestad, Anders; Mæland, Steffen; Strümke, Inga (Peer reviewed; Journal article, 2018-12)
      If a new signal is established in future LHC data, a next question will be to determine the signal composition, in particular whether the signal is due to multiple near-degenerate states. We investigate the performance of ...
    • A Silicon Photomultiplier Based Readout System For A Cosmic Muon Telescope; Design And Implementation 

      Lauritzen, Magne Eik (Master thesis, 2017-06-16)
      The Cosmic Ray Telescope (CRT) is a 4 m^2 scintillator detector segmented into 16 slabs with dimensions of 25100 cm^2. The detector is located at the Department of Physics, University of Bergen, and is intended primarily ...
    • A simple method to detect spontaneous CP violation in multi-Higgs models 

      Øgreid, Odd Magne; Osland, Per; Rebelo, Margarida N. (Peer reviewed; Journal article, 2017-08)
      For models with several Higgs doublets we present an alternative method to the one proposed by Branco, Gerard and Grimus, in 1984, to check whether or not CP is spontaneously violated in the Higgs potential. The previous ...
    • Simplified modelling of explosion propagation by dust lifting in coal mines 

      Skjold, Trygve; Eckhoff, Rolf Kristian; Arntzen, Bjørn Johan; Lebecki, K.; Dyduch, Z.; Klemens, R.; Zydak, P. (Chapter; Peer reviewed, 2007)
      Dispersion of accumulated layers of combustible dust by turbulent flow or shock waves ahead of the propagating flame may sustain explosion propagation in coal mine galleries and other industrial facilities. The mechanisms ...