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Bilde av Gulbrandsen, Njål
Bilde av Gulbrandsen, Njål
Reaseacher Tromsø Geofys Observator njal.gulbrandsen@uit.no +4777623201 You can find me here

Njål Gulbrandsen

  • Gunter Stober, Sharon L. Vadas, Erich Becker, Alan Liu, Alexander Kozlovsky, Diego Janches et al.:
    Gravity waves generated by the Hunga Tonga-Hunga Ha′apai volcanic eruption and their global propagation in the mesosphere/lower thermosphere observed by meteor radars and modeled with the High-Altitude general Mechanistic Circulation Model
    Atmospheric Chemistry and Physics (ACP) 2024 ARKIV / DOI
  • Juha-Pekka Vierinen, F.L. Poblet, J.L. Chau, V. Avsarkisov, Hans Laszlo Pecseli, M. Tsutsumi et al.:
    Dissipation Rates of Mesospheric Stratified Turbulence From Multistatic Meteor-Radar Observations
    Geophysical Research Letters 2024 ARKIV / DOI
  • Jorge L. Chau, Facundo L. Poblet, Hanli Liu, Alan Liu, Njål Gulbrandsen, Christoph Jacobi et al.:
    Mesosphere and Lower Thermosphere Wind Perturbations Due To the 2022 Hunga Tonga-Hunga Ha'apai Eruption as Observed by Multistatic Specular Meteor Radars
    Radio Science 2024 ARKIV / DOI
  • E.C.M. Dawkins, D Janches, Gunter Stober, J.D. Carrillo-Sánchez, R.S. Lieberman, C. Jacobi et al.:
    Seasonal and Local Time Variation in the Observed Peak of the Meteor Altitude Distributions by Meteor Radars
    Journal of Geophysical Research (JGR): Atmospheres 2024 DOI
  • E.C.M. Dawkins, G. Stober, D. Janches, J.D. Carrillo-Sánchez, R.S. Lieberman, C. Jacobi et al.:
    Solar Cycle and Long-Term Trends in the Observed Peak of the Meteor Altitude Distributions by Meteor Radars
    Geophysical Research Letters 2023 ARKIV / DOI
  • Baozhu Zhou, Wen Yi, Xianghui Xue, Hailun Ye, Jie Zeng, Guozhu Li et al.:
    Impact of sudden stratospheric warmings on the neutral density, temperature and wind in the MLT region
    Frontiers in Astronomy and Space Sciences 2023 ARKIV / DOI
  • Gunter Stober, Alan Liu, Alexander Kozlovsky, Zishun Qiao, Witali Krochin, Guochun Shi et al.:
    Identifying gravity waves launched by the Hunga Tonga-Hunga Ha′apai volcanic eruption in mesosphere/lower-Thermosphere winds derived from CONDOR and the Nordic Meteor Radar Cluster
    Annales Geophysicae 2023 ARKIV / DOI
  • Florian Günzkofer, Dimitry Pokhotelov, Gunter Stober, Ingrid Brigitte Mann, Sharon L. Vadas, Erich Becker et al.:
    Inferring neutral winds in the ionospheric transition region from atmospheric-gravity-wave traveling-ionospheric-disturbance (AGW-TID) observations with the EISCAT VHF radar and the Nordic Meteor Radar Cluster
    Annales Geophysicae 2023 ARKIV / DOI
  • Juliana Jaen, Toralf Renkwitz, Huixin Liu, Christoph Jacobi, Robin Wing, Aleš KuchaÅ™ et al.:
    Long-Term studies of the summer wind in the mesosphere and lower thermosphere at middle and high latitudes over Europe
    Atmospheric Chemistry and Physics (ACP) 2023 ARKIV / DOI
  • Gunter Stober, Alan Liu, Alexander Kozlovsky, Zishun Qiao, Ales Kuchar, Christoph Jacobi et al.:
    Meteor radar vertical wind observation biases and mathematical debiasing strategies including the 3DVAR+DIV algorithm
    Atmospheric Measurement Techniques 2022 ARKIV / DOI
  • Njål Gulbrandsen, Åshild Fredriksen :
    RFEA Measurements of High-Energy Electrons in a Helicon Plasma Device with Expanding Magnetic Field
    Frontiers in Physics 2017 ARKIV / DOI
  • Jøran Idar Moen, Keisuke Hosokawa, Njål Gulbrandsen, Lasse Boy Novock Clausen :
    On the symmetry of ionospheric polar cap patch exits around magnetic midnight
    Journal of Geophysical Research (JGR): Space Physics 2015 ARKIV / DOI
  • Njål Gulbrandsen, Åshild Fredriksen, Jerry Carr, Jr, Earl Scime :
    A comparison of ion beam measurements by retarding field energy analyzer and laser induced fluorescence in helicon plasma devices
    Physics of Plasmas 2015 DOI
  • Åshild Fredriksen, Njål Gulbrandsen :
    Beam formation in a weakly collisional expanding, inductively coupled plasma.
    IEEE Sarnoff Symposium 2014 SAMMENDRAG / DOI
  • Njål Gulbrandsen, Wojciech Jacek Miloch, Åshild Fredriksen :
    Interpretation of Ion Velocity Distributions Measured with a Grounded Retarding Field Energy Analyzer (RFEA) in an Inductively Coupled Helicon Plasma
    Contributions to Plasma Physics 09. January 2013 DOI
  • Jerry Carr, Paul A. Cassak, Matthew Galante, Amy M. Keesee, Greg Lusk, Richard M. Magee et al.:
    Spontaneous ion beam formation in the laboratory, space, and simulation
    Physics of Plasmas 2013 DOI
  • Åshild Fredriksen, Wojciech Jacek Miloch, Njål Gulbrandsen, Lekha Nath Mishra :
    On the Use of a Retarding Field Energy Analyzer for Plasma Flow Analysis
    Contributions to Plasma Physics 2013 DOI
  • Richard M. Magee, Matthew E. Galante, Njål Gulbrandsen, Dustin W. McCarren, Earl Scime :
    Direct measurements of the ionization profile in krypton helicon plasmas
    Physics of Plasmas 2012 DOI
  • B. Urban E. Brändström, Carl-Fredrik Enell, Ola Widell, Thord Hansson, Daniel Whiter, Sanna Mäkinen et al.:
    Results from the intercalibration of optical low-light calibration sources 2011
    Geoscientific Instrumentation, Methods and Data Systems 2011 OMTALE / ARKIV / DOI
  • Wojciech Jacek Miloch, Njål Gulbrandsen, Lekha Nath Mishra, Åshild Fredriksen :
    Ion velocity distributions in the sheath and presheath of a biased object in plasma
    Physics of Plasmas 2011 DOI
  • Wojciech Jacek Miloch, Njål Gulbrandsen, Lekha Nath Mishra, Åshild Fredriksen :
    The role of acceptance angle in measurements with ion energy analyzers: Study by numerical simulations
    Applied Physics Letters 2010 DATA / DOI
  • Åshild Fredriksen, Lekha Nath Mishra, Njål Gulbrandsen, Wojciech Jacek Miloch :
    On the measurement of subsonic flow in a capacitevly coupled helicon plasma source
    Journal of Physics: Conference Series (JPCS) 2010 DATA / ARKIV / DOI
  • Jøran Idar Moen, Njål Gulbrandsen, Dag Arne Lorentzen, HC Carlson :
    On the MLT distribution of F region polar cap patches at night
    Geophysical Research Letters 2007 DOI
  • Andres Spicher, Axel Steuwer, Devin Ray Huyghebaert, Yasunobu Ogawa, Juha Vierinen, Johann Immanuel Stamm et al.:
    EISCAT 3D Status and Future Development
    2023
  • Andres Spicher, Axel Steuwer, Devin Ray Huyghebaert, Yasunobu Ogawa, Juha Vierinen, Johann Immanuel Stamm et al.:
    EISCAT and EISCAT 3D Primer
    2023
  • Lisa Marie Buschmann, Njål Gulbrandsen, Åshild Fredriksen :
    Energetic electrons upstream and downstream of a current-free double layer (CFDL) in an inductively coupled helicon plasma.
    2019
  • Åshild Fredriksen, Njål Gulbrandsen, Lisa Marie Buschmann, Erik Varberg :
    On the ion beams and energetic electrons through a current-free double layer(CFDL)
    2019
  • Åshild Fredriksen, Njål Gulbrandsen, Lisa Buschmann :
    Energetic electrons near a current-free double layer in inductively coupled helicon plasma.
    2018
  • Jøran Idar Moen, K. Hosokawa, Njål Gulbrandsen, Lasse Boy Novock Clausen :
    On the Symmetry of Ionospheric Polar Cap Patch Exits Around Magnetic Midnight
    2014
  • Njål Gulbrandsen, Åshild Fredriksen :
    Comparison of ion beam diagnostics with laser induced fluorescence (LIF) and retarding field energy analyzer (RFEA) in a low-temperature RF-plasma
    2014
  • Åshild Fredriksen, Njål Gulbrandsen :
    Beam formation in a weakly collisional expanding, inductively coupled plasma.
    2014
  • Åshild Fredriksen, Njål Gulbrandsen :
    Ion beam formation in a plasma with expanding magnetic field
    2013
  • Åshild Fredriksen, Njål Gulbrandsen, Wojciech Jacek Miloch :
    Potential and ion flow profiles in a Helicon-source plasma
    2013
  • Åshild Fredriksen, Njål Gulbrandsen, Wojciech Jacek Miloch, Alexander Hansen, Earl Scime :
    Plasma flows in expanding magnetic field: simulations, probe and Laser Induced Fluorescence (LIF) measurements
    2012
  • Njål Gulbrandsen, Åshild Fredriksen, Jerry Carr Jr, Earl Scime, Dustin W. McCarren, Robert VanDervort et al.:
    A comparison of ion velocity measurements from retarding field energy analyzer (RFEA) and laser induced fluorescence (LIF) in expanding helicon plasma
    2012
  • Åshild Fredriksen, Njål Gulbrandsen, Wojciech Jacek Miloch :
    Plasma flows in expanding magnetic field
    2012
  • Jøran Idar Moen, Keisuke Hosokawa, Njål Gulbrandsen :
    On the IMF BY dependence on polar cap patch exits at night
    2012
  • Ragnhild Schrøder Hansen, Yngvild Linnea Andalsvik, Anja Lyng Bækken, Jone Reistad, Christine Gabrielse, Owen Roberts et al.:
    Study of an auroral breakup during quiet solar wind conditions
    2011
  • Njål Gulbrandsen, Wojciech Jacek Miloch, Åshild Fredriksen :
    Interpretation of ion velocity distributions measured with a retartding field energy analyzer (RFEA) in a inducitively coupled helicon plasma
    2011
  • Åshild Fredriksen, Wojciech Jacek Miloch, Njål Gulbrandsen, Lekha Nath Mishra :
    The role of sheath and acceptance angle in front of a retarding field energy analyzer for plasma flow analysis
    2011
  • Åshild Fredriksen, Wojciech Jacek Miloch, Njål Gulbrandsen, Lekha Nath Mishra :
    On the use of a retarding field energy analyzer for plasma flow analysis
    2011
  • Wojciech Jacek Miloch, Lekha Nath Mishra, Njål Gulbrandsen, Åshild Fredriksen :
    Numerical simulations of the influence of an ion beam on the plasma analyzer performance in Njord helicon device
    2010
  • Åshild Fredriksen, Lekha Nath Mishra, Njål Gulbrandsen, Wojciech Jacek Miloch :
    Magnetic field geometry, beams and flows in the inductively coupled helicon plasma Njord
    2010
  • Jøran Idar Moen, Njål Gulbrandsen, D. A. Lorentzen :
    Polar cap patches as a new tool to explore tail reconnection dynamics
    2008

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