Njål Gulbrandsen
Stillingsbeskrivelse
Forsker ved Tromsø Geofysiske Observatorium
Florian Günzkofer,
Gunter Stober,
Johan Kero,
David R. Themens,
Anders Tjulin,
Njål Gulbrandsen
m.fl.:
Indications for particle precipitation impact on the ion-neutral collision frequency analyzed with EISCAT measurements
Annales Geophysicae 27. juni 2025 DOI
Arthur Gauthier,
Claudia Borries,
Alexander Kozlovsky,
Diego Janches,
Peter Brown,
Denis Vida
m.fl.:
TIMED Doppler Interferometer measurements of neutral winds at the mesosphere and lower thermosphere and comparison to meteor radar winds
Annales Geophysicae 16. juli 2025 DOI
Andreas Stokholm,
Njål Gulbrandsen,
Nicolas Pedersen,
Andrzej Kucik,
Daniel Haugård Olesen,
Anna Naemi Willer
m.fl.:
The first observations of auroras with dynamic vision sensors
Scientific Reports 22. juli 2025 DOI
Guochun Shi,
Hanli Liu,
Masaki Tsutsumi,
Njål Gulbrandsen,
Alexander Kozlovsky,
Dimitry Pokhotelov
m.fl.:
New insights into the polar ozone and water vapor, radiative effects, and their connection to the tides in the mesosphere–lower thermosphere during major sudden stratospheric warming events
Atmospheric Chemistry and Physics (ACP) 27. august 2025 DOI
J. Federico Conte,
Jorge L. Chau,
Toralf Renkwitz,
Ralph Latteck,
Masaki Tsutsumi,
Christoph Jacobi
m.fl.:
Observing mesoscale dynamics with multistatic specular meteor radars: first climatology of momentum flux, horizontal divergence and relative vorticity over northern central Europe
Annales Geophysicae 20. oktober 2025 DOI
Rudolf Denkmann,
Wenche Aas,
Åshild Ønvik Pedersen,
Jørgen Berge,
Rune Storvold,
Øystein Godøy
m.fl.:
Towards an integrated data-driven infrastructure (InfraNor)
20. januar 2025 DOI
Gunter Stober,
Sharon L. Vadas,
Erich Becker,
Alan Liu,
Alexander Kozlovsky,
Diego Janches
m.fl.:
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
E.C.M. Dawkins,
D Janches,
Gunter Stober,
J.D. Carrillo-Sánchez,
R.S. Lieberman,
C. Jacobi
m.fl.:
Seasonal and Local Time Variation in the Observed Peak of the Meteor Altitude Distributions by Meteor Radars
Juha-Pekka Vierinen,
F.L. Poblet,
J.L. Chau,
V. Avsarkisov,
Hans Laszlo Pecseli,
M. Tsutsumi
m.fl.:
Dissipation Rates of Mesospheric Stratified Turbulence From Multistatic Meteor-Radar Observations
Jorge L. Chau,
Facundo L. Poblet,
Hanli Liu,
Alan Liu,
Njål Gulbrandsen,
Christoph Jacobi
m.fl.:
Mesosphere and Lower Thermosphere Wind Perturbations Due To the 2022 Hunga Tonga-Hunga Ha'apai Eruption as Observed by Multistatic Specular Meteor Radars
Florian Günzkofer,
Dimitry Pokhotelov,
Gunter Stober,
Ingrid Brigitte Mann,
Sharon L. Vadas,
Erich Becker
m.fl.:
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
Juliana Jaen,
Toralf Renkwitz,
Huixin Liu,
Christoph Jacobi,
Robin Wing,
Aleš KuchaÅ™
m.fl.:
Long-Term studies of the summer wind in the mesosphere and lower thermosphere at middle and high latitudes over Europe
Gunter Stober,
Alan Liu,
Alexander Kozlovsky,
Zishun Qiao,
Witali Krochin,
Guochun Shi
m.fl.:
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
Baozhu Zhou,
Wen Yi,
Xianghui Xue,
Hailun Ye,
Jie Zeng,
Guozhu Li
m.fl.:
Impact of sudden stratospheric warmings on the neutral density, temperature and wind in the MLT region
E.C.M. Dawkins,
G. Stober,
D. Janches,
J.D. Carrillo-Sánchez,
R.S. Lieberman,
C. Jacobi
m.fl.:
Solar Cycle and Long-Term Trends in the Observed Peak of the Meteor Altitude Distributions by Meteor Radars
Gunter Stober,
Alan Liu,
Alexander Kozlovsky,
Zishun Qiao,
Ales Kuchar,
Christoph Jacobi
m.fl.:
Meteor radar vertical wind observation biases and mathematical debiasing strategies including the 3DVAR+DIV algorithm
Njål Gulbrandsen,
Åshild Fredriksen
:
RFEA Measurements of High-Energy Electrons in a Helicon Plasma Device with Expanding Magnetic Field
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
Jøran Idar Moen,
Keisuke Hosokawa,
Njål Gulbrandsen,
Lasse Boy Novock Clausen
:
On the symmetry of ionospheric polar cap patch exits around magnetic midnight
Åshild Fredriksen,
Njål Gulbrandsen
:
Beam formation in a weakly collisional expanding, inductively coupled plasma.
2014 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
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. januar 2013 DOI
Jerry Carr,
Paul A. Cassak,
Matthew Galante,
Amy M. Keesee,
Greg Lusk,
Richard M. Magee
m.fl.:
Spontaneous ion beam formation in the laboratory, space, and simulation
Physics of Plasmas 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
m.fl.:
Results from the intercalibration of optical low-light calibration sources 2011
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
Åshild Fredriksen,
Lekha Nath Mishra,
Njål Gulbrandsen,
Wojciech Jacek Miloch
:
On the measurement of subsonic flow in a capacitevly coupled helicon plasma source
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 DOI
Alexander Kozlovsky,
Gunter Stober,
Ruslan Sherstyukov,
Mark Lester,
Evgenia Belova,
Johan Kero
m.fl.:
Atmospheric Gravity Waves and Medium Scale Traveling Ionospheric Disturbances at Auroral Latitudes
Surveys in geophysics 2025 DOI
Andres Spicher,
Axel Steuwer,
Devin Ray Huyghebaert,
Yasunobu Ogawa,
Juha Vierinen,
Johann Immanuel Stamm
m.fl.:
EISCAT and EISCAT 3D Primer
2023
Andres Spicher,
Axel Steuwer,
Devin Ray Huyghebaert,
Yasunobu Ogawa,
Juha Vierinen,
Johann Immanuel Stamm
m.fl.:
EISCAT 3D Status and Future Development
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
Jøran Idar Moen,
Keisuke Hosokawa,
Njål Gulbrandsen
:
On the IMF BY dependence on polar cap patch exits at night
2012
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
m.fl.:
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
Åshild Fredriksen,
Wojciech Jacek Miloch,
Njål Gulbrandsen,
Lekha Nath Mishra
:
On the use of a retarding field energy analyzer for plasma flow analysis
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
Ragnhild Schrøder Hansen,
Yngvild Linnea Andalsvik,
Anja Lyng Bækken,
Jone Reistad,
Christine Gabrielse,
Owen Roberts
m.fl.:
Study of an auroral breakup during quiet solar wind conditions
2011
Åshild Fredriksen,
Lekha Nath Mishra,
Njål Gulbrandsen,
Wojciech Jacek Miloch
:
Magnetic field geometry, beams and flows in the inductively coupled helicon plasma Njord
2010
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
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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