G
G. Holmgren
Researcher at Swedish Institute of Space Physics
Publications - 32
Citations - 1816
G. Holmgren is an academic researcher from Swedish Institute of Space Physics. The author has contributed to research in topics: Electric field & Magnetosphere. The author has an hindex of 18, co-authored 32 publications receiving 1754 citations.
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Journal ArticleDOI
The electric field and wave experiment for the cluster mission
Georg Gustafsson,Rolf Boström,B. Holback,G. Holmgren,A Lundgren,K. Stasiewicz,L. Åhlén,F. S. Mozer,David H. Pankow,Peter Harvey,Peter Berg,R Ulrich,Arne Pedersen,R. Schmidt,A Butler,A W C Fransen,D Klinge,M Thomsen,Carl-Gunne Fälthammar,Per-Arne Lindqvist,Sverker Christenson,J. A. Holtet,Bjørn Lybekk,T A Sten,P. Tanskanen,K. Lappalainen,John R. Wygant +26 more
TL;DR: The electric-field and wave experiment (EFW) on Cluster is designed to measure the electric field and density fluctuations with sampling rates up to 36000 samples s-1 as mentioned in this paper, which can also be used to determine the electron density and temperature.
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Observation of kinetic Alfvén waves by the FREJA spacecraft
Philippe Louarn,Jan-Erik Wahlund,T. Chust,H. de Feraudy,Alain Roux,B. Holback,P. O. Dovner,Anders Eriksson,G. Holmgren +8 more
TL;DR: In this article, it was shown that the low-frequency (from 1 to 20 Hz) auroral electromagnetic turbulence consists of two kinds of phenomena: magnetic fluctuations due to quasi-static currents and strong electric spikes (larger than 100 mV/m) with associated magnetic (30 nT) and density (dn/n ≥ 30%) fluctuations.
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On ion acoustic turbulence and the nonlinear evolution of kinetic Alfvén waves in aurora
Jan-Erik Wahlund,Philippe Louarn,Thomas Chust,H. de Feraudy,Alain Roux,B. Holback,P. O. Dovner,G. Holmgren +7 more
TL;DR: In this article, the authors show a close relationship between solitary kinetic Alfven wave activity and ion acoustic wave activity within auroral energization regions, and argue that these signatures have evolved from solitary kinetic AFW (SKAW) and may be important for auroral energy harvesting.
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Freja observatons of correlated small-scale density depletions and enhanced lower hybrid waves
Anders Eriksson,B. Holback,P. O. Dovner,Rolf Boström,G. Holmgren,Mats André,Lars Eliasson,Paul M. Kintner +7 more
TL;DR: Lower hybrid cavities (LHCs) are commonly observed by the wave instrument on the Freja satellite as mentioned in this paper, where the amplitude of the density depletion is a few per cent of the ambient plasma density, and its width is around 50 m.
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Detailed analysis of broadband electrostatic noise in the dayside auroral zone
TL;DR: The great number of bursts of broadband electrostatic noise (BEN) recorded during crossings of the dayside auroral zone by the Viking satellite enables their statistical study as discussed by the authors, and the angular distribu...