Recent Submissions

  • The Impact of Energetic Electron Precipitation on Mesospheric Hydroxyl Radical 

    Zawedde, Annet Eva (Doctoral thesis, 2018-12-12)
  • Impacts of Ionospheric Ions on Magnetic Reconnection and Earth's Magnetosphere Dynamics 

    Toledo-Redondo, S; Andre, M; Aunai, N; Chappell, Charles Richard; Dargent, Jeremy; Fuselier, S.; Glocer, Alex; Graham, D. B.; Håland, Stein Egil; Hesse, M.; Kistler, L. M.; Lavraud, B.; Li, W.; Moore, T. E.; Tenfjord, Paul Arne Riksheim; Vines, S. K. (Journal article; Peer reviewed, 2021)
    Ionospheric ions (mainly H+, He+, and O+) escape from the ionosphere and populate the Earth's magnetosphere. Their thermal energies are usually low when they first escape the ionosphere, typically a few electron volt to ...
  • A New Concept to Measure the Ambipolar Electric Field Driving Ionospheric Outflow 

    Li, Kun; Håland, Stein Egil; Wei, Yong (Journal article; Peer reviewed, 2021)
    Over the last few decades, the role of ionospheric outflow for the loss of atmospheric constituents, as a plasma supplier to the magnetosphere and hence for the evolution of the Earth’s atmosphere has been recognized. A ...
  • Results of the Electron Drift Instrument on Cluster 

    Paschmann, G; Quinn, Jack M.; Torbert, R.B.; McIllwain, C; Vaith, H; Haaland, S.; Matsui, Hiroshi; Kletzing, Craig A.; Baumjohann, W; Haerendel, G (Journal article; Peer reviewed, 2021)
    The electron drift instrument (EDI) on Cluster pioneered a new method of measuring electric fields, using a beam of electrons to sample the drift velocity over a km-scale gyro orbit. The technique is especially well suited ...
  • Heavy Metal and Rock in Space: Cluster RAPID Observations of Fe and Si 

    Håland, Stein Egil; Daly, Patrick W.; Vilenius, Esa (Journal article; Peer reviewed, 2021)
    Metallic and silicate ions carry essential information about the evolution of the Earth and near-Earth small bodies. Despite this, there has so far been very little focus on ions with atomic masses higher than oxygen in ...
  • Aspects of in situ angular scattering measurements in contrasting waters 

    Sandven, Håkon Johan (Doctoral thesis, 2022-01-28)
    Rapid changes are observed in oceanic and coastal environments around the world due to global temperatures increases, ocean acidification and changing weather patterns - anthropogenic climate change. These changes have ...
  • Analysis of multiple scattering errors in LISST-VSF volume scattering function measurements using Monte Carlo simulations and experimental data 

    Ugulen, Håvard Stavn; Sandven, Håkon; Hamre, Børge; Kristoffersen, Arne Skodvin; Sætre, Camilla (Journal article; Peer reviewed, 2021)
    A Monte Carlo algorithm has been developed to investigate the effects of multiple scattering on the volume scattering function measured by the LISST-VSF instrument. The developed algorithm is compared to experimental results ...
  • Quantification of Cold-Ion Beams in a Magnetic Reconnection Jet 

    Li, Yu-Xuan; Li, Wen-Ya; Tang, Bin-Bin; Norgren, C.; He, Jian-Sen; Wang, Chi; Zong, Qiu-Gang; Toledo-Redondo, S.; André, M.; Chappell, C.; Dargent, J.; Fuselier, S.A.; Glocer, A.; Graham, D.B.; Haaland, S.; Kistler, L.; Lavraud, B.; Moore, T.E.; Tenfjord, P.; Vines, S.K.; Burch, J. (Journal article; Peer reviewed, 2021)
    Cold (few eV) ions of ionospheric origin are widely observed in the lobe region of Earth’s magnetotail and can enter the ion jet region after magnetic reconnection is triggered in the magnetotail. Here, we investigate a ...
  • On the Presence and Thermalization of Cold Ions in the Exhaust of Antiparallel Symmetric Reconnection 

    Norgren, Astrid Elisabet Cecilia; Tenfjord, Paul Arne Riksheim; Hesse, Michael; Toledo-Redondo, Sergio; Li, Wenya; Xu, Yin; Kwagala, Norah Kaggwa; Spinnangr, Susanne Flø; Kolstø, Håkon Midthun; Moretto, Therese (Journal article; Peer reviewed, 2021)
    Using fully kinetic 2.5 dimensional particle-in-cell simulations of anti-parallel symmetric magnetic reconnection, we investigate how initially cold ions are captured by the reconnection process, and how they evolve and ...
  • Medium-induced radiative kernel with the Improved Opacity Expansion 

    Barata, João; Mehtar-Tani, Yacine; Soto-Ontoso, Alba; Tywoniuk, Konrad (Journal article; Peer reviewed, 2021)
    We calculate the fully differential medium-induced radiative spectrum at next-to-leading order (NLO) accuracy within the Improved Opacity Expansion (IOE) framework. This scheme allows us to gain analytical control of the ...
  • Water shutoff and conformance improvement: an introduction 

    Seright, Randall S.; Brattekås, Bergit (Journal article; Peer reviewed, 2021)
    This paper provides an introduction to the topic of water shutoff and conformance improvement. After indicating the volumes of water produced during oilfield operations, a strategy is provided for attacking excess water ...
  • Material properties particularly suited to be measured with helium scattering: selected examples from 2D materials, van der Waals heterostructures, glassy materials, catalytic substrates, topological insulators and superconducting radio frequency materials 

    Holst, Bodil; Alexandrowicz, Gil; Avidor, Nadav; Benedek, Giorgio; Bracco, Gianangelo; Ernst, Wolfgang E.; Farias, Daniel; Jardine, Andrew P.; Lefmann, Kim; Manson, Joseph R.; Marquardt, Roberto; Artés, Salvador Miret; Sibener, Steven J.; Wells, Justin W; Tamtögl, Anton; Allison, William (Journal article; Peer reviewed, 2021)
    Helium Atom Scattering (HAS) and Helium Spin-Echo scattering (HeSE), together helium scattering, are well established, but non-commercial surface science techniques. They are characterised by the beam inertness and very ...
  • 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 ...
  • In Vacuo Dispersion-Like Spectral Lags in Gamma-Ray Bursts 

    Amelino-Camelia, Giovanni; D'Amico, Giacomo; Fiore, Fabrizio; Puccetti, Simonetta; Ronco, Michele (Journal article; Peer reviewed, 2021)
    Some recent studies exposed preliminary but rather intriguing statistical evidence of in vacuo dispersion-like spectral lags for gamma-ray bursts (GRBs), a linear correlation between time of observation and energy of GRB ...
  • Observations of sunlit N2+ aurora at high altitudes during the RENU2 flight 

    Ellingsen, Pål Gunnar; Lorentzen, Dag Arne; Kenward, David; Hecht, James H.; Evans, J. Scott; Sigernes, Fred; Lessard, Marc (Journal article; Peer reviewed, 2021)
    We present measurements of sunlit aurora during the launch of the Rocket Experiment for Neutral Upwelling 2 (RENU2) on the 13 December 2015, 07:34 UTC. The in situ auroral conditions coincide with those of sunlit aurora ...
  • Studies of the linear energy transfer and relative biological effectiveness in proton therapy of pediatric brain tumors 

    Fjæra, Lars Fredrik (Doctoral thesis, 2021-11-25)
    Proton therapy offers a reduction in dose to normal tissue compared to conventional photon-based radiotherapy. This is of particular benefit for pediatric patients as the majority are expected to become long-term survivors. ...
  • Magnetospheric Multiscale Observations of an Expanding Oxygen Wave in Magnetic Reconnection 

    Kolstø, Håkon Midthun; Norgren, Astrid Elisabet Cecilia; Hesse, Michael; Chen, Li-Jen; Tenfjord, Paul; Spinnangr, Susanne Flø; Kwagala, Norah Kaggwa (Journal article; Peer reviewed, 2021)
    Heavier plasma species such as oxygen ions can have a large impact on the magnetic reconnection process. It has been hypothesized that the acceleration of demagnetized oxygen ions by the Hall electric field will lead to ...
  • The Covid-19 shutdown: when studying turns digital, students want more structure 

    Gjerde, Vegard; Gray Jr, Robert; Holst, Bodil; Kolstø, Stein Dankert (Journal article; Peer reviewed, 2021)
    In March 2020, universities in Norway and many other countries shut down due to the Covid-19 pandemic. The students lost access to classrooms, libraries, study halls, and laboratories. Studying turned digital. Because it ...
  • Integrating Cognitive Learning Strategies into Physics Instruction : Developing students’ approaches to physics and learning 

    Gjerde, Vegard (Doctoral thesis, 2021-03-24)
    Introductory physics courses are obligatory for many disciplines outside of physics. As experienced by many students, they are notoriously difficult, often with high failure rates. Many students, whether they passed or ...
  • Lower-thermosphere–ionosphere (LTI) quantities: current status of measuring techniques and models 

    Palmroth, Minna; Grandin, Maxime; Sarris, Theodoros E.; Doornbos, Eelco; Tourgaidis, Stylianos; Aikio, Anita; Buchert, Stephan C.; Clilverd, Mark A.; Dandouras, I; Heelis, Roderick A.; Hoffmann, A; Ivchenko, N.; Kervalishvili, G.; Knudsen, D.; Kotova, A; Liu, H.-L.; Malaspina, D; March, G.; Marchaudon, A; Marghitu, Octav; Matsuo, T; Miloch, Wojciech Jacek; Moretto, Therese; Mpaloukidis, D; Olsen, NIls; Pfaff, R.; Papadakis, K; Pirnaris, Panagiotis; Siemes, C.; Stolle, Claudia; Suni, J.; van den IJssel, J.; Verronen, Pekka T.; Visser, P.; Yamauchi, Masatoshi (Journal article; Peer reviewed, 2021)
    The lower-thermosphere–ionosphere (LTI) system consists of the upper atmosphere and the lower part of the ionosphere and as such comprises a complex system coupled to both the atmosphere below and space above. The atmospheric ...

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