76) J. P. Reistad, N. Østgaard, K. M. Laundal, K. Oksavik.
Generator mechanisms of non-conjugate auroras
J. Geophys. Res., 2012JA018537, in press, 2013.
[pdf]
75) N. Østgaard, T. Gjesteland, B. E. Carlson, A. B. Collier,
S. A. Cummer, G. Lu and H. J. Christian.
Simultaneous observations of optical lightning and terrestrial gamma ray flash from space.
Geophys. Res. Lett., doi:10.1029/2013GL055733. In press, 2013.
[pdf]
74) R. Hansen , N. Østgaard, T. Gjesteland , B. Carlson.
How simulated fluence of photons from Terrestrial Gamma ray flashes at
aircraft and balloon altitudes depends on initial parameters
J. Geophys. Res., In press 2013.
[pdf]
73) N. Østgaard ,B. K. Humberset, K. M. Laundal.
Correction to 'Evolution of auroral asymmetries in the conjugate hemispheres during two substorms.' (paper #59 below)
Geophys. Res. Lett., doi:10.1029/2012GL055020. 2013.
[pdf]
72) S. Milan, M. Dunlop, A. Fazakerley, B. Hubert, B. Lavraud,
N. Østgaard, J. Shi, C. P. Escoubet, M. Taylor, P. Falkner, A. Wielders
KuaFu Sun-Earth connection explorer
Astronomy and Geophysics., 2012
[pdf]
71) S. Haaland, A. Eriksson, E. Engwall, B. Lybekk, H. Nilsson, A. Pedersen,
K. Svenes, M. Andre, M. Forster, K. Li, C. Johnsen, N. Østgaard.
Estimating the capture and loss of cold plasma from ionospheric outflow.
J. Geophys. Res., Vol. 117, A07311, doi:10.1029/2012JA017679, 2012.
[pdf]
70) N. Østgaard, K. M. Laundal, L. Juusola , A. Aasnes, S. E. Haaland, J. M. Weygand.
Correction to 'Interhemispherical asymmetry of substorm onset locations and the Interplanetary Magnetic Field.' (paper #60 below)
Geophys. Res. Lett., Vol. 39, L10104, 2012.
[pdf]
AGU
69) N. Østgaard, T. Gjesteland, R. S. Hansen, A. B. Collier, B. E. Carlson
The true fluence distribution of terrestrial gamma flashes at satellite altitude.
J. Geophys. Res, Vol. 117, A03327, doi:10.1029/2011JA017365, 2012.
[pdf]
AGU
68) T. Gjesteland, N. Østgaard, A. B. Collier, B. E. Carlson, C. Eyles, D.
M. Smith. A new method reveals more TGFs in RHESSI data, Geophys. Res. Lett., Vol. 39, L05102,
doi:10.1029/2012GL050899, 2012
[pdf]
67) K. Snekvik, E. Tanskanaen, N. Østgaard, L. Juusola, K. M. Laundal,
E. I. Gordeev, A. L. Borg.
Changes in the magnetotail configuration before near-Earth reconnection.
J. Geophys. Res, Vol. 117, A02219, doi:10.1029/2011JA017040, 2012.
[pdf]
66) B. E. Carlson, T. Gjesteland, N. Østgaard.
Connecting the terrestrial gamma-ray flash source strength and observed fluence distributions,
J. Geophys. Res., Vol. 117, A01314, doi:10.1029/2011JA017122, 2012.
[pdf]
65) B. E. Carlson, T. Gjesteland, N. Østgaard.
Terrestrial gamma-ray flash electron beam geometry, fluence, and detection frequency.
J. Geophys. Res., Vol.116, No. A11, A11217, doi:10.1029/2011JA016812, 2011.
[pdf]
64) T. Gjesteland, N. Østgaard, A. B. Collier, B. E. Carlson, M. B. Cohen, N. G. Lehtinen
Confining the Angular Distribution of Terrestrial Gamma-ray Flash Emission.
J. Geophys. Res, 116, A11313, doi:10.1029/2011JA016716, 2011.
[pdf]
63) L. Juusola, N. Østgaard, E. Tanskanaen, N. Partamies, K. Snekvik.
Earthward Plasma Sheet Flows During Substorm Phases.
J. Geophys. Res, Vol. 116, A10228, doi:10.1029/2011JA016852, 2011.
[pdf]
62) A. Collier, T. Gjesteland, N. Østgaard.
Assessing the Power Law Distribution of TGFs.
J. Geophys. Res, Vol. 116, A10320, doi:10.1029/2011JA016612, 2011.
[pdf]
61) L. Juusola, N. Østgaard, E. Tanskanaen.
Statistics of Plasma Sheet Convection.
J. Geophys. Res, Vol. 116, A08201,
doi:10.1029/2011JA016479, 2011.
[pdf]
AGU
60) N. Østgaard, K. M. Laundal, L. Juusola , A. Aasnes, S. E. Haaland, J. M. Weygand.
Interhemispherical asymmetry of substorm onset locations and the Interplanetary Magnetic Field.
Geophys. Res. Lett., Vol. 38, L08104, doi:10.1029/2011GL046767, 2011.
See paper #70 with correction
[pdf]
AGU
59) N. Østgaard ,B. K. Humberset, K. M. Laundal.
Evolution of auroral asymmetries in the conjugate hemispheres during two substorms.
Geophys. Res. Lett., Vol. 38, L03101, doi:10.1029/2010GL046057, 2011.
See paper #73 with correction
[pdf]
AGU
58) K. M. Laundal, N. Østgaard, H. U. Frey, J. Weygand.
Seasonal and IMF dependent polar cap contraction during substorm expansion phase
J. Geophys. Res., Vol. 115, A11224, doi: 10.1029/2010JA015910, 2010.
[pdf]
57) H. U. Frey, O. Amm, C. C. Chaston, S. Fu, G. Haerendel, L. Juusola , T.
Karlsson, B. Lanchester, R. Nakamura, N. Østgaard, T. Sakanoi, E. Seran , D.
Whiter, J. Weygand, K. Asamura and M. Hirahara. Small and Meso-scale Properties of a Substorm Onset Auroral
Arc.
J. Geophys. Res., Vol. 115, A10209, doi:10.1029/2010JA015537, 2010.
[pdf]
56) K. M. Laundal, N. Østgaard, K. Snekvik, H. U. Frey.
Inter-hemispheric observations of emerging polar cap
asymmetries
J. Geophys. Res., Vol. 115, No. A7, A07230, doi: 10.1029/2009JA015160.
[pdf]
AGU
55) T. Gjesteland, N. Østgaard, P. H. Connell , J. Stadsnes , G. J. Fishman,
Effects of deadtime losses on Terrestrial Gamma ray Flash (TGF) measurements with the Burst and
Transient Source Experiment (BATSE)
J. Geophys. Res., Vol. 115, A00E21, doi: 10.1029/2009JA014754, 2010.
[pdf]
54) K. M. Laundal and N. Østgaard Asymmetric auroral intensities in the Earth's Northern and Southern
hemispheres.
Highlight and Cover in Nature Letters, Vol. 460, pg. 491-493, doi:10.1038/nature08154, 2009.
paper from the nature site
the cover at nature site
download an e-print version
53) N. Østgaard, K Snekvik, A. L. Borg, A. Åsnes, A. Pedersen, M. Øieroset, T. D. Phan, S. E.
Haaland.
Can magnetotail reconnection produce the auroral intensities observed in the conjugate
ionosphere?
J. Geophys. Res, 114, A06204,doi:10.1029/2009JA014185, 2009.
JGR site: id & pssw: 20978614
[pdf]
52) Anil Bhardwaj, Ronald F. Elsner, G. Randall Gladstone, Graziella Branduardi-Raymont,
Konrad Dennerl, Carey M. Lisse, Thomas E. Cravens, J. Hunter Waite Jr., Nikolai Østgaard,
Stephen M. Petrinec, Bradford J Wargelin, Ina Robertson, Peter Beiersdorfer,
Steven L. Snowden, Vasili Kharchenko. X-ray emission from planets and comets: Relationship with solar X-rays and Solar Wind,
Advances in Geosciences, October, Vol 15, Planetary Science, 2009.
[pdf]
URL reference
51) K. Snekvik, L. Juusola , O. Amm, N. Østgaard.
Reconnection Hall current system observed in the magnetotail
and in the ionosphere.
Geophys. Res. Lett., Vol. 36, L08104, doi:10.1029/2009GL037239, 2009.
[pdf]
50) K. Snekvik, R. Nakamura, N. Østgaard, S. Haaland, A. Retino.
The Hall current system revealed as a statistical significant pattern during fast flows.
Ann. Geophys., Vol 26, No 11, 3429-3437, 2008
[pdf]
49) K. M. Laundal and N. Østgaard Persistent Global Proton Aurora Caused by High Solar Wind Pressure.
J. Geophys. Res., Vol. 113, A08231, doi:10.1029/2008JA013147, 2008.
[pdf]
48) N. Østgaard ,T. Gjesteland, J. Stadsnes, P. H. Connell, B. Carlson.
Production altitude and time delays of the terrestrial gamma flashes:
Revisiting the Burst and Transient Source Experiment spectra.
J. Geophys. Res., 113, A02307, doi:10.1029/2007JA012618, 2008.
[pdf]
47) C. Sætre , C. A. Barth, J. Stadsnes, N. Østgaard, S. M. Baily,
D. N. Baker, G. A. Germany and J. W. Gjerloev. Thermospheric nitric oxide at higher
latitudes - Model calculations with auroral energy input.
J. Geophys. Res., Vol. 112, No. A8, A08306, doi: 19.1029.2006JA012203, 2007.
[pdf]
46) K. Snekvik, S. Haaland, N. Østgaard, H. Hasegawa, R. Nakamura, T. Takada, F. Pitout,
H. R`eme, B. Klecker, and E. A. Lucek.
Cluster observations of a field aligned current at the dawn
flank of a bursty bulk flow.
Ann. Geophys., 25, 1405-1415, 2007.
[pdf]
45) A. L. Borg, N. Østgaard, A. Pedersen M. Øieroset, T. D. Phan, G.
Germany, A. Aasnes, W. Lewis, J. Stadsnes, E. A. Lucek, H. R`eme, C. Moukis. Simultaneous observations of magnetotail
reconnection and bright X-ray aurora on 2. October 2002.
J. Geophys. Res., Vol. 112, No. A6, A06215, doi: 10.1029/2006JA011913, 2007.
[pdf]
44) Anil Bhardwaj, Ronald F. Elsner, G. Randall Gladstone,
Thomas E. Cravens, Carey M. Lisse, Konrad Dennerl, Graziella Branduardi-Raymont, Brad Wargelin, J. Hunter Waite Jr., Ina Robertson,
Nikolai Østgaard, Peter Beiersdorfer,
Steven L. Snowden,
Vasili Kharchenko. X-rays from Solar System Bodies,
Review paper in Planet Space Science, Vol 55/9, pp 1135-1189, doi: 10.1016/j.pss.2006.11.009, 2007.
[online pdf]
43) N. Østgaard , S. B. Mende, H. U. Frey, J. B. Sigwarth, A. Aasnes, J. Weygand.
Auroral conjugacy studies based on global imaging
J. Atmos. Solar-Terr. Phys., special issue from Yosemite 2006, 69, 249-255, 2007.
[pdf]
42) Anil Bhardwaj , G. Randall Gladstone, Ronald F. Elsner, Nikolai Østgaard, J. Hunter
Waite, Jr., Thomas E. Cravens, Shen-Wu Chang, Tariq Majeed, Albert E. Metzger.
First terrestrial soft X-ray auroral observation by the Chandra X-ray Observatory.
J. Atmos. Solar-Terr. Phys., Vol 69/ 1-2 pp 179-187, DOI: 10.1016/j.jastp.2006.07.011, 2007.
[pdf]
41) C. Sætre , C. A. Barth, J. Stadsnes, N. Østgaard, S. M. Baily,
D. N. Baker and J. W. Gjerloev. Comparison of electron energy deposition calculated
by a photochemical nitric oxide model, and derived
from X.ray bremsstrahlung measurements
J. Geophys. Res., Vol. 111, No. A4, A04301
doi:10.1029/2005JA011399, 2006.
[pdf]
40) A. Aksnes , J. Stadsnes, N. Ostgaard, G. A. Germany, K. Oksavik,
R. R. Vondrak, A. Brekke, U. P. Lovhaug.
Height profiles of the ionospheric electron density derived using
space-based remote sensing of UV and X-ray emissions, and EISCAT radar
data: A ground-truth experiment.
J. Geophys. Res., Vol. 111, No. A2, A02301, doi:10.1029/2005JA011331, 2006.
[pdf]
39) E. Tanskanen, M. Palmroth, T.I. Pulkkinen, H.E.J. Koskinen, P. Janhunen, N. Østgaard, J.A.
Slavin, K. Liou. Energetics of a substorm on 15 august, 2001: comparing empirical methods and a
global MHD simulation.
Advances in Space Research, 36, 10, 1825, 2005.
[pdf]
38) N. Østgaard, S. B. Mende , H. U. Frey , J. B.
Sigwarth. Simultaneous imaging of the reconnection spot in the
conjugate hemispheres during northward IMF.
Highlight in Geophys. Res. Lett., Vol. 32, No. 21, L21104, doi: 10.1029/2005GL024491, 2005.
[pdf]
37) M. Palmroth , P. Janhunen, T. I. Pulkkinen, A. Aksnes, G. Lu , N. Østgaard,
J. Watermann, G. D. Reeves, G. A. Germany. Assessment of ionospheric Joule heating by
GUMICS-4 MHD simulation, AMIE, and satellite-based statistics:
Towards a synthesis.
Annales Geophysicae, 23, 2051-2068, 2005,
[pdf]
36) A. Åsnes, J. Stadsnes, R. W. Friedel, N. Østgaard, M. Thomsen.
Medium energy pitch anglke distribution during substorm injected electron
cloud.
Geophys. Res. Lett., Vol. 32, No. 10, L10101, doi: 10.1029/2004GL022008, 2005.
[pdf]
35) A. Åsnes, R. W. Friedel, J. Stadsnes, M. Thomsen, N. Østgaard,
T. Cayton. Statistical pitch angle properties of substorm injected electron
clouds and their relation to dawnside energetic electron precipitation.
J. Geophys. Res., Vol. 110, No. A5, A05207, doi:10.1029/2004JA010838, 2005.
[pdf]
34) O. Amm, A. Aksnes, J. Stadsnes, N. Østgaard, R. R. Vondrak, G. A. Germany,
G. Lu, A. Viljanen. Mesoscale ionospheric electrodynamics of omega bands determined
from ground-based electromagnetic and satellite optical observations.
Ann. Geophys., 23 (2): 325-342 2005.
[pdf]
33) A. Aksnes, O. Amm, J. Stadsnes, N. Østgaard, G. A. Germany, R. R. Vondrak,
I. Sillanpaa. Ionospheric conductances derived from satellite measurements
and auroral UV and X-ray emissions, and ground-based electromagnetic data: A
comparison.
Ann. Geophys., 23 (2): 343-358 2005.
[pdf]
32) A. Kozlovsky, V. Safargaleev, N. Østgaard, T. Turunen, J. Jussila, A
Roldugin. On the motion of dayside auroras caused by a solar wind pressure pulse.
Ann. Geophys., 23 (2): 509-521 2005.
[pdf]
31) N. Østgaard, N. A. Tsyganenko, S. B. Mende , H. U. Frey , T. J. Immel, M. Fillingim, L. A. Frank, J. B.
Sigwarth. Observations and model predictions of substorm auroral asymmetries in the
conjugate hemispheres.
Geophys. Res. Lett., 32, 5, L05111, doi:10.1029/2004GL022166, 2005.
[pdf]
30) N. Østgaard, J. Moen, S. B. Mende, H. U. Frey, T. J. Immel, P. Gallop, K.
Oksavik, M. Fujimoto. Estimates of magnetotail reconnection rate based on IMAGE FUV
and EISCAT measurements
Ann. Geophys. (Eleventh International EISCAT Workshop),
23 (1), 123-134, 2005.
[pdf]
29) T. J. Stubbs , R. R. Vondrak and N. Østgaard, J. B. Sigwarth and
L. A. Frank. Simultaneous observations of the auroral oval in both
hemispheres under varying conditions.
Geophys. Res. Lett., Vol 32, L03103, doi:10.1029/2004GL021199, 2005.
[pdf]
28) H.U. Frey , G. Haerendel, S.B. Mende, W. T. Forrester, T.J. Immel, N. Østgaard.
Sub-auroral morning proton spots (SAMPS) as a result of plasmapause-ring current
interaction,
J. Geophys. Res., 109, A10305, 10.1029/2004JA010516, 2004.
[pdf]
27) C. Sætre , J. Stadsnes, H. Nesse, A. Aksnes, S. M. Petrinec, C. A. Barth,
D. N. Baker, R. R. Vondrak and N. Østgaard. Energetic electron precipitation
and the NO abundance in the upper atmosphere - A direct comparison during
geomagnetic storm.
J. Geophys. Res., Vol. 109, No. A9, A09302
10.1029/2004JA010485, 2004.
[pdf]
26) A. Åsnes, J. Stadsnes, J. Bjordal, N. Østgaard, M. Schulz, D. L. Detrick, T. J. Rosenberg,
S. E. Haaland, H. Singer. Pi2-pulsations observed in energetic electron precipitation and magnetic
field in association with a substorm surge.
Ann. Geophys., 22 (6): 2097-2105, 2004.
[pdf]
25) N. Østgaard, S. B. Mende , H. U. Frey , T. J. Immel, L. A. Frank, J. B.
Sigwarth, T. J. Stubbs. Interplanetary magnetic field control of the location of
substorm onset and auroral features in the conjugate hemispheres.
J. Geophys. Res., Vol. 109, No. A7, A07204, 10.1029/2003JA010370, 2004
[pdf]
24) C. J. Farrugia, P. E. Sandholt, R. B. Torbert, N. Østgaard. Temporal and spatial
aspects of the cusp inferred from local and global ground- and space-based
observations in a case study.
J. Geophys. Res., Vol. 109, No. A4, A04209
10.1029/2003JA010121, 2004.
[pdf]
23) H.U. Frey , N. Østgaard, T.J. Immel, H. Korth, S.B. Mende,
Seasonal dependence of localized, High Latitude Dayside Aurora (HiLDA).
J. Geophys. Res., Vol. 109, No. A4, A04303, doi: 10.1029/2003JA010293, 2004.
[pdf]
22) A. Aksnes, J Stadsnes, G. Lu, N. Østgaard, R. R. Vondrak, D. L. Detrick, T. J. Rosenberg,
G. A. Germany, M. Schulz. Effects of energetic electrons on the electrondynamics in the ionosphere.
Ann. Geophys., 2, 475 - 496, 2004.
[pdf]
21) N. Østgaard, S. B. Mende, H. U.
Frey, L. A. Frank , J. B. Sigwarth. Observations of non-conjugate theta
aurora.
Geophys. Res. Lett., Vol. 30, No. 21, 2125, doi: 10.1029/2003GL017914, 2003.
[pdf]
20) M. Meurant, J.-C. Gérard, B. Hubert, C. Blockx,
N. Østgaard, S.B. Mende.
Dynamics of global scale electron and proton precipitation induced by a solar wind pressure pulse.
Geophys. Res. Lett., Vol. 30, No. 20, 2032, doi: 10.1029/2003GL018017, 2003
[pdf]
19) S. B. Mende, C. W. Carlson, H. U. Frey, L. M. Peticolas, N. Østgaard.
FAST and IMAGE-FUV observations of a Substorm onset.
J. Geophys. Res.,Vol. 108, (A9), 1344, doi:10.1029/2002JA009787, 2003.
[pdf]
18) H. U. Frey, S. B. Mende, T. J. Immel, S. A. Fuselier, N. Østgaard. Proton aurora in the
CUSP during southward IMF.
J. Geophys. Res.,108 (A7), 1277 , doi:10.1029/2003JA009861R, 2003.
[pdf]
17) N. Østgaard, S. B. Mende, H. U. Frey, G. R. Gladstone, H. Lauche.
Neutral hydrogen density profiles derived from geocoronal imaging.
J. Geophys. Res., Vol. 108, No. A7, 1300, doi:10.1029/2002JA009749, 2003.
[pdf]
16) T. Christensen, N. Østgaard, T. J. Rosenberg, D. L. Detrick, G. A. Germany,
P. Stauning. Conjugate high-intensity energetic electron precipitation at high latitude.
Ann. Geophysicae, 21, 1443-1455, 2003 .
[pdf]
15) T. J. Immel, S. B. Mende, H. U. Frey, N. Østgaard, G. R. Gladstone. Effect of the July 14, 2000 solar flare
on Earth's FUV emissions.
J. Geophys. Res., Vol. 108 (A4), 1155, doi:10.1029/2001JA009060, 2003.
[pdf]
14) H. U. Frey, T. J. Immel, G. Lu, J. Bonnell, S. A. Fuselier, S. B. Mende, B. Hubert, N. Østgaard, G. Le.
Properties of localized, high latitude, dayside aurora.
J. Geophys. Res., Vol. 108 (A4), 8008, doi:10.1029/2002JA009356, 2003.
[pdf]
13) N. Østgaard, D. L. Detrick, T. J. Rosenberg, R. R. Vondrak, H. U. Frey, S. B. Mende, S. E. HÅland, J.
Stadsnes, High-latitude dayside energetic precipitation and IMF BZ rotations.
J. Geophys. Res., Vol. 108 (A4), 8013, doi:10.1029/2002JA009350, 2003
[pdf]
12) N. Østgaard, G. A. Germany, J. Stadsnes, R. R. Vondrak. Energy analysis of substorms based on remote sensing
techniques, solar wind measurements and geomagnetic indices.
J. Geophys. Res.,
Vol. 107, NO. A9, 1233, doi: 10.1029/2001JA002002, 2002.
[pdf]
11) N. Østgaard, R. R. Vondrak, J. W. Gjerloev, G. A. Germany. A relation between the energy deposition by
electron precipitation and geomagnetic indices during substorms.
J. Geophys. Res.,
Vol. 107, NO. A9, 1246, doi: 10.1029/2001JA002003, 2002.
[pdf]
10) J. A. Slavin, D. H. Fairfield, R. P. Lepping, M. Hesse, A. Ieda, E. Tanskanen, N. Østgaard, T. Mukai, T.
Nagai, H. J. Singer, P. R. Sutcliffe. Simultaneous observations of earthward flow bursts and plasmoid
ejection during magnetospheric substorms.
J. Geophys. Res.,Vol. 107, NO. A7, 10.1029/2000JA003501, 2002.
[pdf]
9) A. Aksnes, J. Stadsnes, J. Bjordal, N. Østgaard, R. R. Vondrak, D. L. Detrick, T. J. Rosenberg, G. A.
Germany, D. Chenette. Instantaneous ionosphericglobal conductance maps during an isolated substorm.
Ann.
Geophysicae, 20, 1181 - 1191, 2002.
[pdf]
8) N. Østgaard, J. Stadsnes, J. Bjordal, G. A. Germany, R. R. Vondrak, G. K. Parks, S. A Cummer, D. L.
Chenette, J. G. Pronko. Auroral electron distributions derived from combined UV and X-ray emissions.
J. Geophys. Res., Vol.106, 26,081 - 26,090, 2001.
[pdf]
7) J. Bjordal, L. Borovkov, I. Kornilov, T. Kornilova, L. Lazutin, N. Østgaard, J. Stadsnes, G. Starkov, E.
Thorsen, S. Chernouss. Structure of polar aurora over Kola Peninsula and X-ray oval measured by Polar
satellite on February 9, 1997.
Geomagnetism and Aeronomie, No.3, 2000.
6) N. Østgaard, J. Stadsnes, J. Bjordal, R. R. Vondrak, S. A Cummer, D. L. Chenette, M. Schulz, J. G.
Pronko. Cause of the localized maximum of X-ray emission in the morning sector: A comparison with electron
measurements.
J. Geophys. Res., Vol. 105, No A9, p. 20,869 - 20,885, 2000.
[pdf]
5) N. Østgaard, J. Stadsnes, J. Bjordal, R. R. Vondrak, S. A Cummer, D. L. Chenette, M. Schulz, G. K. Parks, M.
J. Brittnacher, D. L. McKenzie, J. G. Pronko. Global X-ray emission during an isolated substorm - A case
study.
J. Atmos. Solar-Terr. Phys., Vol. 62 (10), p. 889 - 900, 2000.
[pdf]
4) S. A. Cummer, R. R. Vondrak, N. Østgaard, J. Bjordal, J. Stadsnes, D. L. Chenette, G. K. Parks, M. J.
Brittnacher, L. Frank and J. Sigwarth. Global multi-spectral auroral imaging of an isolated substorm.
Geophys. Res. Letter, Vol 27, No 5, p. 637-640, 2000.
[pdf]
3) S. Håland, N. Østgaard, J. Bjordal, J. Stadsnes, S. Ullaland, G. D. Reeves, D. L. Chenette, B. Wilken, T.
Yamamoto, T. Doke, G. K. Parks, M. J. Brittnacher. Magnetospheric and Ionospheric Response to a Substorm:
Geotail HEP-LD and Polar PIXIE Observations.
J. Geophys. Res., Vol. 104, No. A12, p. 28,459. 1999.
[pdf]
2) N. Østgaard, J. Stadsnes, J. Bjordal, R. R. Vondrak, S. A Cummer, D. L. Chenette, G. K. Parks, M. J.
Brittnacher, D. L. McKenzie. Global Scale Electron Precipitation Features seen in UV and X-rays During
Substorms.
J. Geophys. Res., Vol. 104, p. 10,191 - 10,204, 1999.
[pdf]
1) N. Østgaard, J. Stadsnes, K. Aarsnes, F. Søraas, Karl Måseide, M. Smith, J.Sharber. Simultaneous
Measurements of X-rays and Electrons During a Pulsating Aurora.
Ann. Geophysicae, 16, 148 - 160, 1998.
[pdf]
5) S. Haaland, K. Li, A. Eriksson, M. Andre, E. Engwall, M. Forster, C. Johnsen,
B. Lybekk, H. Nilsson, N. Østgaard, A. Pedersen,
K. Svenes.
Cold ion outflow as source of plasma for the magnetosphere.
AGU monograph, 'Relationship between Auroral Phenomenology and Magnetospheric Processes', June 2012.
[pdf]
4)A. Keiling, K. Shiokawa, V. Uritsky, V. Sergeev, E. Zesta,
L. Kepko, N. Østgaard.
Auroral Signatures of the Dynamic Plasma Sheet
AGU monograph, 'Relationship between Auroral Phenomenology and Magnetospheric Processes', Feb 2012.
[pdf]
3)N. Østgaard and K. M. Laundal
Auroral asymmetries in the conjugate hemispheres and
interhemispheric currents
AGU monograph, 'Relationship between Auroral Phenomenology and Magnetospheric Processes',
#2011BK001190, Nov 2011.
[pdf]
2) N. Østgaard and E. Tanskanen. Energetics of isolated and stormtime substorms.
Disturbances in Geospace:
The Storm-Substorm Relationship, Geophysical Monograph 142. doi: 10.1029/142GM14, 2003.
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1) D. L. Chenette, W. L. Imhof, S. M. Petrinec, M. Schulz, J. Mobilia, J. G. Pronko, M. A. Rinaldi, J. B.
Cladis, F. Fenrich, N. Østgaard, M. C. McNab. Global Energy-Resolved X-Ray Images of Northern Aurora and
Their Mappings to the Equatorial Magnetosphere.
in The Physics of Sun-Earth Plasma and Field Processes,
edited by J. L. Burch,
Geophysical Monograph Series, AGU, Washington, D.C., 109, 1998.
16) M. Berthomier, A. N. Fazakerley, C. Forsyth, R. Pottelette,
O. Alexandrova, A. Anastasiadis, A. Aruliah, P.-L. Blelly, C. Briand,
R. Bruno, P. Canu, B. Cecconi, T. Chust, I. Daglis, J. Davies, M. Dunlop,
D. Fontaine, V. Génot, B. Gustavsson, G. Haerendel, M. Hamrin,
M. Hapgood, S. Hess, D. Kataria, K. Kauristie, S. Kemble,
Y. Khotyaintsev, H. Koskinen, L. Lamy, B. Lanchester, P. Louarn,
E. Lucek, R. Lundin, M. Maksimovic, J. Manninen, A. Marchaudon,
O. Marghitu, G. Marklund, S. Milan, J. Moen, F. Mottez, H. Nilsson,
N. Ostgaard, C. J. Owen, M. Parrot, A. Pedersen, C. Perry, J.-L. Pinçon,
F. Pitout, T. Pulkkinen, I. J. Rae, L. Rezeau, A. Roux, I. Sandahl,
I. Sandberg, E. Turunen, J. Vogt, A. Walsh, C. E. J. Watt, J. A. Wild,
M. Yamauchi, P. Zarka, I. Zouganelis. Alfvén: magnetosphere\u2014ionosphere connection
explorers,
Astrophysical Instrumentation and
Methods
ISSN 0922-6435
Exp Astron
DOI 10.1007/s10686-011-9273-y, 2011.
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15) L. R. Cenkeramaddi, G. Genov, K. Njøten, M. E. Rostad, Y. Skogseide, M. Roscoe, A. Solberg, J. Stadsnes, K. Ullaland, N. Østgaard,
C. Budtz-Jørgensen, I. Kuvvetli, S. Mikkelsen, G. Mæhlum. Low-energy CZT detector array
for the ASIM mission.
2012 IEEE International Instrumentation and Measurement Technology Conference, Graz, Austria, May 13-16, 2012.
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14) Y. Skogseide, L. R. Cenkeramaddi, G. Genov, K. Njøten, M. E. Rostad, A. Solberg, J. Stadsnes, K. Ullaland, N. Østgaard,
C. Budtz-Jørgensen, I. Kuvvetli. BGO Front-End Electronics and Signal Processing in the MXGS Instrument for the ASIM Mission.
2012 IEEE International Instrumentation and Measurement Technology Conference, Graz, Austria, May 13-16, 2012.
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13) A. Collier, T. Gjesteland, N. Østgaard.
Terrestrial Gamma-ray Flash Intensity Distribution. Proceedings of the URSI GA, 2011.
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12) B. E. Carlson, T. Gjesteland, N. Østgaard.
The frequency of Terrestrial Gamma-ray Flash Electron Beam Observations. Proceedings of the URSI GA, 2011.
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11) T. Gjesteland, N. Østgaard, A. B. Collier, B. E. Carlson, M. B. Cohen, N. G. Lehtinen
Confining the Angular Distribution of TGF Emission. Proceedings of the URSI GA, 2011.
[pdf]
10) J-B Renard, G Berthet, V Catoire, N Huret,
D Lagoutte, F Lefeuvre, J-L Pincon, C Robert, M Tagger, E Seran, M Godefroy, P-L Blelly, S Soula,
S Coquillat, N Østgaard, T Neubert, F Lebrun
COBRAT project: Long duration balloons for the study of high energy phenomena and consequence for stratospheric chemistry,
19th ESA symposium on balloon and rocket, 2009.
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9) K. Olafsson, N. Østgaard and E. Tanskanen
The Space Science Suitcase - Instruments for exploring Near-Earth Space from Classroom, Earth Moon Planet, doi 10.1007/s11038-008-9261-z, 2008.
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8) C. Budtz-Jørgensen I. Kuvvetli, Y. Skogseide, K. Ullaland, N. Østgaard.
Characterization fo CZT detectors fro the ASIM mission, Converence Record from IEEE, Dresden, October 2008.
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7) S. Mikkelsen D. Meier, G. Mæhlum, B. Sundal, J. Talebi,
A. Helland, N. Østgaard, Y. Skogseide, K. Ullaland.
Low-Power and Low-Noise Multi Channel ASIC for X-ray and Gamma-Ray Spectrosopy,
AMISCA, Cascais, Portugal, August 2008.
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6) N. Østgaard , S. B. Mende, H. U. Frey, J. B. Sigwarth, A. Aasnes, J. Weygand.
Conjugate imaging of substorms.
Proceedings from the ICS 8, 2006, in Banff, Canada, ISBN 978-0-88953-312-7, 2007.
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5) T. Neubert, I. Kuvvetli, C. Budtz-Jorgensen, N. Østgaard, V. Reglero,
N. Arnold. The Atmosphere-Space Interactions Monitor (ASIM) for the International
Space Station. Proceedings from the ILWS Goa Workshop. p 448, ISBN-81-87099-40-2,
Quest Publications, 2006.
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4) J. Nystrand, K. BrØnstad, G. Eigen, F. Eisele, P. Fischer, H.
Helstrup, N. Herrmann, V. Lindenstruth, R. Männer, K. Meier, N. Østgaard, D.
Röhrich, B. Skaali, J. Stachel, J. Stadsnes, S. Stapnes, B. Stugu, B.G.
Svensson, T. Tveter, K. Ullaland, and U. Uwer. The International Research
Training Group. Development and Application of Intelligent Detectors.
Proceedings from the EUI-Net conference, Tallin, May, 2006.
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3) O. Amm, A. Aksnes, J. Stadsnes, N. Østgaard, R. R. Vondrak, G. A. Germany,
I. Sillanpaa. Observations and analysis of ionospheric electrodynamics during
a substorm recovery phase using the MIRACLE network.
Proceedings from the ICS 7 in Finland, 2004.
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2) A. Bhardwaj , G. R. Gladstone, R. F. Elsner, J. H. Waite, Jr., D. Grodent,
T. E. Cravens, R. R. Howell, A. E. Metzger, N. Østgaard, A. Maurellis,
R. E. Johnson, M. C. Weisskopf, T. Majeed , P. G. Ford, A. F. Tennant,
J. T. Clarke, W. S. Lewis, K. C. Hurley, F. J. Crary, E. D. Feigelson,
G. P. Garmire, D. T. Young, M. K. Dougherty, S. A. Espinosa, J.-M. Jahn.
Soft X-ray emissions from planets, moons and comets.
ESA-SP-514, Proc. ESLAB 36
Symposium, 'Earth-Like Planets and Moons', ESTEC, Noordwijk,
3-8 June 2002, pp215-226. 2002.
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1) N. Østgaard, J. Stadsnes, J. Bjordal, E. Thorsen, R. R. Vondrak, S. A. Cummer, D. L. Chenette, G. K. Parks,
M. J. Brittnacher, D. L. McKenzie. Global Scale Electron Precipitation During Substorm Expansions.
Proceedings of the International Conference on Substorms -4, 55 - 58, 1998, Terra Scientific Publishing
Company, Tokyo, edited by S. Kokubun and Y. Kamide.
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3) T. Gjesteland, N. Østgaard, R. S. Hansen, J. Stadsnes, Jordiske Gammaglimt.
Fra Fysikkens Verden, Nr. 2 - 2010, 72 Årgang
2) N. Østgaard, J. Bjordal, J. Stadsnes, E. Thorsen. PIXIE data processing at the University of Bergen.
Scientific/Technical Report No 1999-05, Dept. of Physics, University of Bergen, ISSN 0803-2696, May 1999.
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1) N. Østgaard, J. Stadsnes, K. Aarsnes, F. Søraas, M. Smith. PULSAUR II Launched 01.23 MLT 9.2.1994: X-ray
Measurements During a Pulsating Aurora.
Scientific/Technical Report No 1996-08, Dept. of Physics, University
of Bergen, ISSN 0803-2696, August 1996