Njål Gulbrandsen
Job description
Forsker ved Tromsø Geofysiske Observatorium
Rudolf,
Wenche,
Åshild Ønvik,
Jørgen,
Rune,
Øystein
et al.:
Towards an integrated data-driven infrastructure (InfraNor)
2025 DOI
Gunter,
Sharon L.,
Erich,
Alan,
Alexander,
Diego
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
E.C.M.,
D,
Gunter,
J.D.,
R.S.,
C.
et al.:
Seasonal and Local Time Variation in the Observed Peak of the Meteor Altitude Distributions by Meteor Radars
Juha-Pekka,
F.L.,
J.L.,
V.,
Hans Laszlo,
M.
et al.:
Dissipation Rates of Mesospheric Stratified Turbulence From Multistatic Meteor-Radar Observations
Jorge L.,
Facundo L.,
Hanli,
Alan,
Njål,
Christoph
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
Florian,
Dimitry,
Gunter,
Ingrid Brigitte,
Sharon L.,
Erich
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
Juliana,
Toralf,
Huixin,
Christoph,
Robin,
Aleš
et al.:
Long-Term studies of the summer wind in the mesosphere and lower thermosphere at middle and high latitudes over Europe
Gunter,
Alan,
Alexander,
Zishun,
Witali,
Guochun
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
Baozhu,
Wen,
Xianghui,
Hailun,
Jie,
Guozhu
et al.:
Impact of sudden stratospheric warmings on the neutral density, temperature and wind in the MLT region
E.C.M.,
G.,
D.,
J.D.,
R.S.,
C.
et al.:
Solar Cycle and Long-Term Trends in the Observed Peak of the Meteor Altitude Distributions by Meteor Radars
Gunter,
Alan,
Alexander,
Zishun,
Ales,
Christoph
et al.:
Meteor radar vertical wind observation biases and mathematical debiasing strategies including the 3DVAR+DIV algorithm
Njål,
Åshild
:
RFEA Measurements of High-Energy Electrons in a Helicon Plasma Device with Expanding Magnetic Field
Njål,
Åshild,
Jerry Carr,,
Earl
:
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,
Keisuke,
Njål,
Lasse Boy Novock
:
On the symmetry of ionospheric polar cap patch exits around magnetic midnight
Åshild,
Njål
:
Beam formation in a weakly collisional expanding, inductively coupled plasma.
2014 DOI
Åshild,
Wojciech Jacek,
Njål,
Lekha Nath
:
On the Use of a Retarding Field Energy Analyzer for Plasma Flow Analysis
Contributions to Plasma Physics 2013 DOI
Njål,
Wojciech Jacek,
Åshild
:
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. janvier 2013 DOI
Jerry,
Paul A.,
Matthew,
Amy M.,
Greg,
Richard M.
et al.:
Spontaneous ion beam formation in the laboratory, space, and simulation
Physics of Plasmas 2013 DOI
Richard M.,
Matthew E.,
Njål,
Dustin W.,
Earl
:
Direct measurements of the ionization profile in krypton helicon plasmas
Physics of Plasmas 2012 DOI
B. Urban E.,
Carl-Fredrik,
Ola,
Thord,
Daniel,
Sanna
et al.:
Results from the intercalibration of optical low-light calibration sources 2011
Wojciech Jacek,
Njål,
Lekha Nath,
Åshild
:
Ion velocity distributions in the sheath and presheath of a biased object in plasma
Physics of Plasmas 2011 DOI
Åshild,
Lekha Nath,
Njål,
Wojciech Jacek
:
On the measurement of subsonic flow in a capacitevly coupled helicon plasma source
Wojciech Jacek,
Njål,
Lekha Nath,
Åshild
:
The role of acceptance angle in measurements with ion energy analyzers: Study by numerical simulations
Applied Physics Letters 2010 DOI
Jøran Idar,
Njål,
Dag Arne,
HC
:
On the MLT distribution of F region polar cap patches at night
Geophysical Research Letters 2007 DOI
Alexander,
Gunter,
Ruslan,
Mark,
Evgenia,
Johan
et al.:
Atmospheric Gravity Waves and Medium Scale Traveling Ionospheric Disturbances at Auroral Latitudes
Surveys in geophysics 2025 DOI
Andres,
Axel,
Devin Ray,
Yasunobu,
Juha,
Johann Immanuel
et al.:
EISCAT and EISCAT 3D Primer
2023
Andres,
Axel,
Devin Ray,
Yasunobu,
Juha,
Johann Immanuel
et al.:
EISCAT 3D Status and Future Development
2023
Lisa Marie,
Njål,
Åshild
:
Energetic electrons upstream and downstream of a current-free double
layer (CFDL) in an inductively coupled helicon plasma.
2019
Åshild,
Njål,
Lisa Marie,
Erik
:
On the ion beams and energetic electrons through a current-free double layer(CFDL)
2019
Åshild,
Njål,
Lisa
:
Energetic electrons near a current-free double layer in inductively coupled helicon plasma.
2018
Jøran Idar,
K.,
Njål,
Lasse Boy Novock
:
On the Symmetry of Ionospheric Polar Cap Patch Exits Around Magnetic Midnight
2014
Njål,
Åshild
:
Comparison of ion beam diagnostics with laser induced fluorescence (LIF) and retarding field energy analyzer (RFEA) in a low-temperature RF-plasma
2014
Åshild,
Njål
:
Beam formation in a weakly collisional expanding, inductively coupled plasma.
2014
Åshild,
Njål
:
Ion beam formation in a plasma with expanding magnetic field
2013
Åshild,
Njål,
Wojciech Jacek
:
Potential and ion flow profiles in a Helicon-source plasma
2013
Jøran Idar,
Keisuke,
Njål
:
On the IMF BY dependence on polar cap patch exits at night
2012
Åshild,
Njål,
Wojciech Jacek,
Alexander,
Earl
:
Plasma flows in expanding magnetic field: simulations, probe and Laser Induced Fluorescence (LIF) measurements
2012
Njål,
Åshild,
Jerry Carr,
Earl,
Dustin W.,
Robert
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,
Njål,
Wojciech Jacek
:
Plasma flows in expanding magnetic field
2012
Åshild,
Wojciech Jacek,
Njål,
Lekha Nath
:
On the use of a retarding field energy analyzer for plasma flow analysis
2011
Njål,
Wojciech Jacek,
Åshild
:
Interpretation of ion velocity distributions measured with a retartding field energy analyzer (RFEA) in a inducitively coupled helicon plasma
2011
Åshild,
Wojciech Jacek,
Njål,
Lekha Nath
:
The role of sheath and acceptance angle in front of a retarding field energy analyzer for plasma flow analysis
2011
Ragnhild Schrøder,
Yngvild Linnea,
Anja Lyng,
Jone,
Christine,
Owen
et al.:
Study of an auroral breakup during quiet solar wind conditions
2011
Åshild,
Lekha Nath,
Njål,
Wojciech Jacek
:
Magnetic field geometry, beams and flows in the inductively coupled helicon plasma Njord
2010
Wojciech Jacek,
Lekha Nath,
Njål,
Åshild
:
Numerical simulations of the influence of an ion beam on the plasma analyzer performance in Njord helicon device
2010
Jøran Idar,
Njål,
D. A.
:
Polar cap patches as a new tool to explore tail reconnection dynamics
2008
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