Results 1 to 10 of about 5,710 (186)

Electron precipitation characteristics during isolated, compound, and multi-night substorm events [PDF]

Annales Geophysicae, 2021
A set of 24 isolated, 46 compound, and 36 multi-night substorm events from the years 2008–2013 have been analysed in this study. Isolated substorm events are defined as single expansion–recovery phase pairs, compound substorms consist of multiple phase ...
N. Partamies, N. Partamies, F. Tesema, F. Tesema, E. Bland, E. Heino, H. Nesse Tyssøy, E. Kallelid, E. Kallelid   +8 more
doaj   +1 more source

A statistical study of polar cap flow channels observed in both hemispheres using SuperDARN radars

Journal of Space Weather and Space Climate, 2022
This paper details the first large-scale, interhemispheric statistical study into ionospheric fast flow (>900 m/s) channels in the polar cap using the SuperDARN radar network.
Herlingshaw Katie, Baddeley Lisa, Oksavik Kjellmar, Lorentzen Dag A., Laundal Karl M.   +4 more
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Space and atmospheric physics on Svalbard: a case for continued incoherent scatter radar measurements under the cusp and in the polar cap boundary region

Progress in Earth and Planetary Science, 2023
Incoherent scatter radars (ISRs) represent the only instrument (both ground and space based) capable of making high temporal and spatial resolution measurements of multiple atmospheric parameters—such as densities, temperatures, particle velocities, mass
Lisa Baddeley, Dag Lorentzen, Stein Haaland, Erkka Heino, Ingrid Mann, Wojciech Miloch, Kjellmar Oksavik, Noora Partamies, Andres Spicher, Juha Vierinen   +9 more
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Reconfiguration and closure of lobe flux by reconnection during northward IMF: possible evidence for signatures in cusp/cleft auroral emissions [PDF]

Annales Geophysicae, 1999
Observations are presented of the response of the dayside cusp/cleft aurora to changes in both the clock and elevation angles of the interplanetary magnetic field (IMF) vector, as monitored by the WIND spacecraft.
M. Lockwood, M. Lockwood, J. Moen
doaj   +1 more source

Impact of planktivorous little auks ( Alle alle) on soil organic matter in Spitsbergen, High Arctic [PDF]

Polish Polar Research, 2023
Seabirds constitute an important link between marine and terrestrial ecosystems, one of its manifestations being the transport of organic matter from the sea to breeding grounds.
Wojciech Szymański, Adrian Zwolicki, Katarzyna Zmudczyńska-Skarbek, Lech Stempniewicz   +3 more
doaj   +1 more source

Auroral all-sky camera calibration [PDF]

Geoscientific Instrumentation, Methods and Data Systems, 2014
A two-step procedure to calibrate the spectral sensitivity to visible light of auroral all-sky cameras is outlined. Center pixel response is obtained by the use of a Lambertian surface and a standard 45 W tungsten lamp.
F. Sigernes, S. E. Holmen, D. Biles, H. Bjørklund, X. Chen, M. Dyrland, D. A. Lorentzen, L. Baddeley, T. Trondsen, U. Brändström, E. Trondsen, B. Lybekk, J. Moen, S. Chernouss, C. S. Deehr   +14 more
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Multi-method geophysical mapping of ground properties and periglacial geomorphology in Hans Glacier forefield, SW Spitsbergen [PDF]

Polish Polar Research, 2022
This article presents the results of a geophysical survey from which detailed images of glacial and periglacial landforms and subsurface structures were obtained.
Artur Marciniak, Marzena Osuch, Tomasz Wawrzyniak, Bartosz Owoc, Wojciech Dobiński, Michał Glazer, Mariusz Majdański   +6 more
doaj   +1 more source

Jupyter Book as an open online teaching environment in the geosciences: lessons learned from Geo-SfM and Geo-UAV [PDF]

Geoscience Communication
Together with our students, we co-created two open-access geoscientific course modules using the Jupyter Book environment. We also assessed the Jupyter Book environment, integrated with GitHub to facilitate versioning, for its suitability for co-creation
P. Betlem, P. Betlem, P. Betlem, N. Rodes, S. M. Cohen, M. A. Vander Kloet, M. A. Vander Kloet   +6 more
doaj   +1 more source

Digital Drill Core Models: Structure-from-Motion as a Tool for the Characterisation, Orientation, and Digital Archiving of Drill Core Samples

Remote Sensing, 2020
Structure-from-motion (SfM) photogrammetry enables the cost-effective digital characterisation of seismic- to sub-decimetre-scale geoscientific samples.
Peter Betlem, Thomas Birchall, Kei Ogata, Joonsang Park, Elin Skurtveit, Kim Senger   +5 more
doaj   +1 more source

Permafrost trapped natural gas in Svalbard, Norway

Frontiers in Earth Science, 2023
Permafrost is widespread in the High Arctic, including the Norwegian archipelago of Svalbard. The uppermost permafrost intervals have been well studied, but the processes at its base and the impacts of the underlying geology have been largely overlooked.
Thomas Birchall, Malte Jochmann, Malte Jochmann, Peter Betlem, Peter Betlem, Kim Senger, Andrew Hodson, Andrew Hodson, Snorre Olaussen   +8 more
doaj   +1 more source