469 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Centre for Arctic Gas Hydrate, Environment and ClimateNO44 papers
- Centre National de la Recherche ScientifiqueFR28 papers
- University of OsloNO21 papers
- Norwegian Computing CenterNO16 papers
- University of WarwickGB13 papers
- University of ArizonaUS12 papers
- Technical University of DenmarkDK11 papers
- KTH Royal Institute of TechnologySE10 papers
- Massachusetts Institute of TechnologyUS10 papers
- Norwegian University of Science and TechnologyNO10 papers
- Observatoire de ParisFR10 papers
- University Hospital of North NorwayNO10 papers
21 papers · 1 filter
Geometric Shape Modelling and Volume Estimation of Dry Bulk Cargo Piles using a Single Image
Debanshu Ratha, Madhu Koirala, Pål Gunnar Ellingsen
Volume estimation of onshore cargo piles is of economic importance for shipping and mining companies as well as public authorities for real-time planning of logistics, business int…
A Characteristic Signature of Magnetospheric Wave-Particle Interactions Found in the Turbulent E-region
Magnus F Ivarsen, Yukinaga Miyashita, Jean-Pierre St-Maurice +16
Plasma waves in the magnetosphere scatter electrons, causing them to precipitate into Earth's atmosphere, imparting their temporal characteristics to diffuse auroras. In a case stu…
A Point-cloud Clustering & Tracking Algorithm for Radar Interferometry
Magnus F Ivarsen, Jean-Pierre St-Maurice, Glenn C Hussey +2
In data mining, density-based clustering, which entails classifying datapoints according to their distributions in some space, is an essential method to extract information from la…
Modelling Solar Orbiter Dust Detection Rates in Inner Heliosphere as a Poisson Process
Samuel Kočiščák, Andreas Kvammen, Ingrid Mann +3
Solar Orbiter provides dust detection capability in inner heliosphere, but estimating physical properties of detected dust from the collected data is far from straightforward. Firs…
First Radar -- CubeSat Transionospheric HF Propagation Observations: Suomi 100 Satellite and EISCAT HF Facility
Esa Kallio, Antti Kero, Ari-Matti Harri +14
Radio waves provide a useful diagnostic tool to investigate the properties of the ionosphere because the ionosphere affects the transmission and properties of High Frequency (HF) e…
Energetic Electron Precipitation Occurrence Rates Determined Using the Syowa East SuperDARN Radar
Emma C. Bland, Noora Partamies, Erkka Heino +2
We demonstrate that the Super Dual Auroral Radar Network (SuperDARN) radar at Syowa station, Antarctica, can be used to detect high frequency radio wave attenuation in the D region…
First dust measurements with the Solar Orbiter Radio and Plasma Wave instrument
A. Zaslavsky, I. Mann, J. Soucek +20
Impacts of dust grains on spacecraft are known to produce typical impulsive signals in the voltage waveform recorded at the terminals of electric antennas. Such signals are routine…
Patch Size Evolution During Pulsating Aurora
N. Partamies, K. Bolmgren, E. Heino +3
We report both decreasing and increasing trends in the patch sizes during pulsating aurora events. About 150 pulsating auroral events over the Fennoscandian Lapland have been succe…
Cosmic Noise Absorption During Solar Proton Events in WACCM-D and Riometer Observations
Erkka Heino, Pekka T. Verronen, Antti Kero +2
Solar proton events (SPEs) cause large-scale ionization in the middle atmosphere leading to ozone loss and changes in the energy budget of the middle atmosphere. The accurate imple…
Eastward-expanding auroral surges observed in the post-midnight sector during a multiple-onset substorm
Yoshimasa Tanaka, Yasunobu Ogawa, Akira Kadokura +9
We present three eastward-expanding auroral surge (EEAS) events that were observed intermittently at intervals of about 15 min in the post-midnight sector (01:55-02:40 MLT) by all-…
Network analysis of geomagnetic substorms using the SuperMAG database of ground-based magnetometer stations
J. Dods, S. C. Chapman, J. W. Gjerloev
The overall morphology and dynamics of magnetospheric substorms is well established in terms of the observed qualitative auroral features seen in ground-based magnetometers. This p…
Multi-Spacecraft Measurement of Turbulence within a Magnetic Reconnection Jet
K. T. Osman, K. H. Kiyani, W. H. Matthaeus +3
The relationship between magnetic reconnection and plasma turbulence is investigated using multipoint in-situ measurements from the Cluster spacecraft within a high-speed reconnect…
Magnetic Reconnection and Intermittent Turbulence in the Solar Wind
K. T. Osman, W. H. Matthaeus, J. T. Gosling +5
A statistical relationship between magnetic reconnection, current sheets and intermittent turbulence in the solar wind is reported for the first time using in-situ measurements fro…
Anisotropic Intermittency of Magnetohydrodynamic Turbulence
K. T. Osman, K. H. Kiyani, S. C. Chapman +1
A higher-order multiscale analysis of spatial anisotropy in inertial range magnetohydrodynamic turbulence is presented using measurements from the STEREO spacecraft in fast ambient…
Proton Kinetic Effects and Turbulent Energy Cascade Rate in the Solar Wind
Kareem T. Osman, William H. Matthaeus, Khurom H. Kiyani +2
The first observed connection between kinetic instabilities driven by proton temperature anisotropy and estimated energy cascade rates in the turbulent solar wind is reported using…
Proton Kinetic Effects in Vlasov and Solar Wind Turbulence
S. Servidio, K. T. Osman, F. Valentini +5
Kinetic plasma processes have been investigated in the framework of solar wind turbulence, employing Hybrid Vlasov-Maxwell (HVM) simulations. The dependency of proton temperature a…
Is there long-range memory in solar activity on time scales shorter than the sunspot period?
Martin Rypdal, Kristoffer Rypdal
The sunspot number (SSN), the total solar irradiance (TSI), a TSI reconstruction, and the solar flare index (SFI), are analyzed for long-range persistence (LRP). Standard Hurst ana…
Organization of the magnetosphere during substorms
Tatjana Zivkovic, Kristoffer Rypdal
The change in degree of organization of the magnetosphere during substorms is investigated by analyzing various geomagnetic indices, as well as interplanetary magnetic field z-comp…
Low-dimensionality and predictability of solar wind and global magnetosphere during magnetic storms
Tatjana Zivkovic, Kristoffer Rypdal
The storm index SYM-H, the solar wind velocity v, and interplanetary magnetic field Bz show no signatures of low-dimensional dynamics in quiet periods, but tests for determinism in…
Cavitating Langmuir Turbulence in the Terrestrial Aurora
B. Isham, M. T. Rietveld, P. Guio +3
Langmuir cavitons have been artificially produced in the earth's ionosphere, but evidence of naturally-occurring cavitation has been elusive. By measuring and modeling the spectra…
The Capabilities of the EISCAT Svalbard Radar for Inter-hemispheric Coordinated Studies
Tom Grydeland, Anja Strømme, Tony van Eyken +1
In this article we want to present the EISCAT Svalbard Radar (ESR) in some detail, as well as some of the instruments of interest for ionospheric and magnetospheric research that a…