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S. Ullaland · SciRah

Researcher profile · Semantic Scholar

S. Ullaland

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S. Ullaland — researcher profile on SciRah

h-index: 16
Works: 44
Citations: 837

Most-cited papers

RAPID – The Imaging Energetic Particle Spectrometer on Cluster
B. Wilken, W. I. Axford, I. Daglis, P. Daly +29 more
1993157 citations
Semantic Scholar
Geotail observations of energetic ion species and magnetic field in plasmoid-like structures in the course
Q. Zong, B. Wilken, G. Reeves, I. Daglis +11 more
199780 citations
Semantic Scholar
Tailward flowing energetic oxygen ion bursts associated with multiple flux ropes in the distant magnetotail: GEOTAil observations
B. Wilken, Q.-G. Zong, I. Daglis, T. Doke +5 more
199549 citations
Semantic Scholar
Electron and Proton wide-Angle Spectrometer (EPAS) on the CRRES spacecraft
A. Korth, G. Kremser, B. Wilken, W. Guettler +2 more
199248 citations
Semantic Scholar
Energetic oxygen ion bursts in the distant magnetotail as a product of intense substorms: Three case studies
Q. Zong, B. Wilken, J. Woch, T. Mukai +7 more
199847 citations Open access
Semantic Scholar
Field‐aligned beams of energetic electrons (16 keV ≤ E ≤ 80 keV) observed at geosynchronous orbit at substorm onsets
G. Kremser, A. Korth, S. Ullaland, S. Perraut +4 more
198841 citations
Semantic Scholar
The Energetic Particle Spectrometer Hep onboard the Geotail Spacecraft
T. Doke, M. Fujii, M. Fujimoto, K. Fujiki +32 more
199439 citations Open access
Semantic Scholar
On the morphology of auroral-zone X-ray events—I Dynamics of midnight events
J. Bjordal, H. Trefall, S. Ullaland, A. Bewersdorff +5 more
197136 citations
Semantic Scholar
Coordinated balloon‐satellite observations of energetic particles at the onset of a magnetospheric substorm
G. Kremser, J. Bjordal, L. Block, K. Bronstad +11 more
198230 citations
Semantic Scholar
On the morphology of auroral-zone X-ray events—II. Events during the early morning hours
G. Kremser, K. Wilhelm, W. Riedler, K. Bronstad +5 more
197330 citations
Semantic Scholar
Different phases of a magnetospheric substorm on June 23, 1979
P. Tanskanen, J. Kangas, L. Block, G. Kremser +8 more
198727 citations
Semantic Scholar
Observations of large-scale coherent pulsating electron precipitation events in the auroral zone, accompanied by geomagnetic continuous pulsations
S. Ullaland, H. Trefall, G. Kremser, A. Bewersdorff
196726 citations
Semantic Scholar
Energetic Electron Precipitation During a Magnetospheric Substorm and Its Relationship to Wave Particle Interaction
G. Kremser, A. Korth, S. Ullaland, J. Stadsnes +10 more
198624 citations
Semantic Scholar
Energetic neutral atoms in the outer magnetosphere: An upper flux limit obtained with the HEP‐LD Spectrometer on board GEOTAIL
B. Wilken, I. Daglis, A. Milillo, S. Orsini +3 more
199723 citations Open access
Semantic Scholar
Electron precipitation associated with a sudden commencement of a geomagnetic storm
S. Ullaland, K. Wilhelm, J. Kangas, W. Riedler
197023 citations
Semantic Scholar
Simultaneous balloon measurements of auroral X-rays during slowly varying ionospheric absorption events
A. Bewersdorff, G. Kremser, J. Stadsnes, H. Trefall +1 more
196820 citations
Semantic Scholar
On the development of a magnetospheric substorm influenced by a storm sudden commencement: Ground, balloon, and satellite observations
S. Ullaland, G. Kremser, P. Tanskanen, A. Korth +4 more
199316 citations
Semantic Scholar
Morphology and fine time structure of an early-morning electron precipitation event
H. Trefall, S. Ullaland, J. Stadsnes, I. Singstad +6 more
197515 citations
Semantic Scholar
On the extension of auroral-zone X-ray microbursts
H. Trefall, J. Bjordal, S. Ullaland, J. Stadsnes
196615 citations
Semantic Scholar
Substorm activity on January 11, 1994: Geotail observations in the distant tail during the leading phase of a corotating interaction region
B. Wilken, Q. Zong, T. Doke, T. Mukai +5 more
199814 citations
Semantic Scholar
Simultaneous observations of a pulsation event from the ground, with balloons and with a geostationary satellite on August 12, 1978
I. B. Iversen, L. Block, K. Bronstad, R. Grard +10 more
198414 citations
Semantic Scholar
A study of the interaction of VLF waves with equatorial electrons and its relationship to auroral X-rays in the morning sector
K. Torkar, W. Riedler, G. Kremser, A. Korth +8 more
198710 citations
Semantic Scholar
Investigation of the conjugacy between auroral breakup and energetic electron injection
L. Lazutin, L. Borovkov, T. Kozelova, I. Kornilov +4 more
20008 citations Open access
Semantic Scholar
Magnetospheric and ionospheric response to a substorm : Geotail HEP-LD and Polar PIXIE observations
S. Håland, N. Østgaard, J. Bjordal, J. Stadsnes +8 more
19998 citations
Semantic Scholar
Dynamics of the plasma sheet in the dawn sector of the magnetosphere: Observations from CRRES
A. Korth, R. Friedel, D. Baker, H. Lühr +3 more
19947 citations
Semantic Scholar
Large-scale auroral-zone electron precipitation event, briefly interrupted during a negative magnetic impulse
T. Pytte, J. Bjordal, K. Bronstad, I. Singstad +5 more
19745 citations
Semantic Scholar
Auroral X-rays and equatorial electrons in the morning sector
K. Torkar, W. Riedler, G. Kremser, A. Korth +7 more
19844 citations
Semantic Scholar
Long-Period Pulsations of Auroral-Zone X-Rays
H. Trefall, S. Ullaland
1964Nature4 citations
Semantic Scholar
Propagation velocities and dimensions of plasmoid structures in the near‐Earth magnetotail
Stein Håland, F. Søraas, S. Ullaland
19993 citations
Semantic Scholar
Auroral zone X-ray pulsations associated with VLF pulsations: B16-3N balloon experiment
H. Yamagishi, T. Ono, H. Fukunishi, T. Yamagami +7 more
19843 citations
Semantic Scholar
Geoactivity at X=−200 RE in the tail-the trailing phase of a solar wind high speed sector
B. Wilken, Q. Zong, T. Doke, S. Kokubun +1 more
19982 citations
Semantic Scholar
GEOTAIL observation of energetic ion species and magnetic field in plasmoid-like structures in the course of a substorm
Q. Zong, B. Wilken, I. Daglis, S. Livi +9 more
19962 citations
Semantic Scholar
Testing of some substorm features by multiple balloon observations
J. Kangas, P. Tanskanen, A. Korth, G. Kremser +6 more
19842 citations
Semantic Scholar
SBARMO‐79; A Multi‐Balloon Campaign in the Auroral Zone
P. Tanskanen, J. Bjordal, L. Block, K. Bronstad +14 more
20131 citations
Semantic Scholar
X-line formation in the near-earth magnetotail during magnetospheric substorms
S. Håland, S. Ullaland, B. Wilken, Q. Zong +3 more
19981 citations
Semantic Scholar
Radiation belt proton contribution to substorm structure and dynamics
L. Lazutin, T. Kozelova, R. Rasinkangas, A. Korth +4 more
19981 citations
Semantic Scholar
Preliminary results from the auroral zone ionosphere observations during the AZCO balloon campaign in 1985
I. B. Iversen, H. Miyaoka, N. Sato, S. Ullaland +1 more
19871 citations
Semantic Scholar
On the origin of electron precipitation in the auroral zone related to the onset of magnetospheric substorms
G. Kremser, J. Bjordal, K. Bronstad, I. B. Iversen +10 more
19811 citations
Semantic Scholar
A case study of the January 23-24, 1991 substorm event
R. Stadsnes, S. Håland, S. Ullaland, A. Korth +4 more
19960 citations
Semantic Scholar
On the relationship between cosmic noise absorption and auroral X-rays—a case study
K. Olafsson, S. Ullaland
19890 citations
Semantic Scholar
Balloon measurements in future exploration of auroral zone phenomena
S. Ullaland
19850 citations
Semantic Scholar
The Co-Ordinated EISCAT and Balloon Observations (cebo) - Experiment and Results
S. Ullaland, T. Hansen, W. Riedler
19850 citations
Semantic Scholar
Observations during a magnetosphere substorm triggered by a Storm Sudden Commencement (SSC): A case study
S. Ullaland, J. Stadsnes, M. Haavaag, J. Bjordal +6 more
19840 citations
Semantic Scholar
Electron precipitation in the auroral zone at the beginning of a geomagnetic storm /SSC/
S. Ullaland, G. Kremser, W. Riedler, P. Tanskanen
19760 citations
Semantic Scholar

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