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nikolai østgaard
nikolai østgaard
Professor in space physics at the University of Bergen
Verified email at uib.no
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Year
X-rays from solar system objects
A Bhardwaj, RF Elsner, GR Gladstone, TE Cravens, CM Lisse, K Dennerl, ...
Planetary and Space Science 55 (9), 1135-1189, 2007
1602007
Production altitude and time delays of the terrestrial gamma flashes: Revisiting the Burst and Transient Source Experiment spectra
N Østgaard, T Gjesteland, J Stadsnes, PH Connell, B Carlson
Journal of Geophysical Research: Space Physics 113 (A2), 2008
1472008
Overview of solar wind–magnetosphere–ionosphere–atmosphere coupling and the generation of magnetospheric currents
SE Milan, LBN Clausen, JC Coxon, JA Carter, MT Walach, K Laundal, ...
Space Science Reviews 206, 547-573, 2017
1412017
The ASIM mission on the international space station
T Neubert, N Østgaard, V Reglero, E Blanc, O Chanrion, CA Oxborrow, ...
Space Science Reviews 215, 1-17, 2019
1252019
Neutral hydrogen density profiles derived from geocoronal imaging
N Østgaard, SB Mende, HU Frey, GR Gladstone, H Lauche
Journal of Geophysical Research: Space Physics 108 (A7), 2003
1122003
FAST and IMAGE‐FUV observations of a substorm onset
SB Mende, CW Carlson, HU Frey, LM Peticolas, N Østgaard
Journal of Geophysical Research: Space Physics 108 (A9), 2003
1102003
How the IMF By induces a By component in the closed magnetosphere and how it leads to asymmetric currents and convection patterns in the two hemispheres
P Tenfjord, N Østgaard, K Snekvik, KM Laundal, JP Reistad, S Haaland, ...
Journal of Geophysical Research: Space Physics 120 (11), 9368-9384, 2015
1082015
Asymmetric auroral intensities in the Earth’s Northern and Southern hemispheres
KM Laundal, N Østgaard
Nature 460 (7254), 491-493, 2009
1052009
Energy analysis of substorms based on remote sensing techniques, solar wind measurements, and geomagnetic indices
N Østgaard, G Germany, J Stadsnes, RR Vondrak
Journal of Geophysical Research: Space Physics 107 (A9), SMP 9-1-SMP 9-14, 2002
1042002
Interplanetary magnetic field control of the location of substorm onset and auroral features in the conjugate hemispheres
N Østgaard, SB Mende, HU Frey, TJ Immel, LA Frank, JB Sigwarth, ...
Journal of Geophysical Research: Space Physics 109 (A7), 2004
1032004
Effects of dead time losses on terrestrial gamma ray flash measurements with the Burst and Transient Source Experiment
T Gjesteland, N Østgaard, PH Connell, J Stadsnes, GJ Fishman
Journal of Geophysical Research: Space Physics 115 (A5), 2010
842010
A relation between the energy deposition by electron precipitation and geomagnetic indices during substorms
N Østgaard, RR Vondrak, JW Gjerloev, G Germany
Journal of Geophysical Research: Space Physics 107 (A9), SMP 16-1-SMP 16-7, 2002
812002
Simultaneous observations of earthward flow bursts and plasmoid ejection during magnetospheric substorms
JA Slavin, DH Fairfield, RP Lepping, M Hesse, A Ieda, E Tanskanen, ...
Journal of Geophysical Research: Space Physics 107 (A7), SMP 13-1-SMP 13-23, 2002
812002
A terrestrial gamma-ray flash and ionospheric ultraviolet emissions powered by lightning
T Neubert, N Østgaard, V Reglero, O Chanrion, M Heumesser, ...
Science 367 (6474), 183-186, 2020
782020
First 10 months of TGF observations by ASIM
N Østgaard, T Neubert, V Reglero, K Ullaland, S Yang, G Genov, ...
Journal of Geophysical Research: Atmospheres 124 (24), 14024-14036, 2019
772019
Observations and model predictions of substorm auroral asymmetries in the conjugate hemispheres
N Østgaard, NA Tsyganenko, SB Mende, HU Frey, TJ Immel, M Fillingim, ...
Geophysical research letters 32 (5), 2005
772005
Simultaneous observations of optical lightning and terrestrial gamma ray flash from space
N Østgaard, T Gjesteland, BE Carlson, AB Collier, SA Cummer, G Lu, ...
Geophysical Research Letters 40 (10), 2423-2426, 2013
732013
Observations of non‐conjugate theta aurora
N Østgaard, SB Mende, HU Frey, LA Frank, JB Sigwarth
Geophysical Research Letters 30 (21), 2003
732003
The true fluence distribution of terrestrial gamma flashes at satellite altitude
N Østgaard, T Gjesteland, RS Hansen, AB Collier, B Carlson
Journal of Geophysical Research: Space Physics 117 (A3), 2012
722012
Earthward plasma sheet flows during substorm phases
L Juusola, N Østgaard, E Tanskanen, N Partamies, K Snekvik
Journal of Geophysical Research: Space Physics 116 (A10), 2011
712011
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