Results 51 to 60 of about 4,774 (237)

Observed effects of a geomagnetic storm on an RTK positioning network at high latitudes

Journal of Space Weather and Space Climate, 2012
At high latitudes, above 60° N, in the vicinity of the auroral oval, the ionosphere frequently experiences disturbed conditions that impact GNSS-based services.
Jacobsen Knut Stanley, Schäfer Sebastian   +1 more
doaj   +1 more source

Ionospheric currents estimated simultaneously from CHAMP satelliteand IMAGE ground-based magnetic field measurements: a statisticalstudy at auroral latitudes [PDF]

Annales Geophysicae, 2004
One important contribution to the magnetic field measured at satellite altitude and at ground level comes from the external currents. We used the total field data sampled by the Overhauser Magnetometer on CHAMP and the horizontal magnetic field ...
P. Ritter, H. Lühr, A. Viljanen, O. Amm, A. Pulkkinen, I. Sillanpää   +5 more
doaj   +1 more source

Cold Plasma Source of Upflowing Ionospheric Ions in the Nightside Auroral Ionosphere

Journal of geomagnetism and geoelectricity, 1996
The frequent occurrence of energetic O+ upflowing ionospheric ions (UFI) at high altitude during auroral substorms raises the question of the cold plasma source and acceleration altitude for the O+ ions, and their possible effects on the substorm-time plasma sheet.
Yau, A. W., Abe, T., Whalen, B. A.
openaire   +2 more sources

Auroral streamers and magnetic flux closure [PDF]

, 2007
peer reviewedOn 7 December 2000 at 2200 UT an auroral streamer was observed to develop above Scandinavia with the IMAGE-FUV global imagers. The ionospheric equivalent current deduced from the MIRACLE-IMAGE Scandinavian ground-based network of ...
Kauristie, K., Hubert, Benoît, Hubert, B., Milan, S. E., S. W. H. Cowley (7590302), Steve E. Milan (7589666), Grocott, A., Adrian Grocott (7590026), Pulkkinen, T. I., Cowley, S. W. H., B. Hubert (7590023), O. Amm (7591346), K. Kauristie (7591778), Amm, O., T. I. Pulkkinen (7591781)   +14 more
core   +1 more source

Possible role of magnetosphere-ionosphere coupling in auroral arc generation [PDF]

Annales Geophysicae, 2000
Three models for the magnetosphere-ionosphere coupling feedback instability are considered. The first model is based on demagnetization of hot ions in the plasma sheet.
W. Lyatsky, A. M. Hamza
doaj   +1 more source

Production of small-scale Alfvén waves by ionospheric depletion, nonlinear magnetosphere-ionosphere coupling and phase mixing [PDF]

, 2013
The authors acknowledge the International Space Science Institute (Switzerland) for funding the program that inspired this work. AJBR is grateful to the Royal Commission for the Exhibition of 1851 for present support and acknowledges an STFC studentship ...
Russell, A. J.B., Wright, A. N., Streltsov, A. V., Wright, A.N., A. J. B. Russell, Russell, A.J.B., A. N. Wright, Russell, A. J. B., A. V. Streltsov, Streltsov, A.V.   +9 more
core   +1 more source

Nonlinear model of short-scale electrodynamics in the auroral ionosphere [PDF]

Annales Geophysicae, 2000
The optical detection of auroral subarcs a few tens of m wide as well as the direct observation of shears several m/s per m over km to sub km scales by rocket instrumentation both indicate that violent and highly localized electrodynamics can occur at
J.-M. A. Noël, J.-P. St.-Maurice, P.-L. Blelly   +2 more
doaj   +1 more source

Studies of the Conductivities in the Auroral Zone Ionosphere

Journal of geomagnetism and geoelectricity, 1991
A review of some recent studies by EISCAT of the conductivities in the auroral zone ionosphere is presented. The quiet time Hall and Pedersen conductivities appear to vary smoothly with the solar zenith angle in agreement with a photochemical equilibrium state of the ionospheric plasma.
BREKKE, A., MOEN, J., HALL, C.
openaire   +2 more sources

Localized fast flow disturbance observed in the plasma sheet and in the ionosphere [PDF]

, 2005
An isolated plasma sheet flow burst took place at 22:02 UT, 1 September 2002, when the Cluster footpoint was located within the area covered by the Magnetometers-Ionospheric Radars-All-sky Cameras Large Experiment (MIRACLE). The event was associated with
A. Balogh (7591361), Laakso, H., H. Rème, Balogh, A., Klecker, B., N.C. Draper (7591352), Mccrea, I. W., H. Laakso (7591349), Draper, N. C., Adrian Grocott (7590026), A. Grocott, M. André (3683134), Amm, O., McCrea, I., Rème, H., André, M., H. Laakso, Nakamura, R., Draper, N., O. Amm, Lester, M., H. Rème (7591274), I. W. McCrea, Grocott, A., M. Lester, R. Nakamura (7591343), A. Balogh, M. Lester (7589660), M. André, N. C. Draper, I.W. McCrea (7591358), B. Klecker, B. Klecker (7591355), O. Amm (7591346), R. Nakamura   +34 more
core   +1 more source

First Kinetic 3‐D Simulations of the High‐Latitude Electrojet Spanning an Entire Turbulent Flux Tube

Geophysical Research Letters, Volume 53, Issue 13, 16 July 2026.
Abstract Radar and rocket observations of the terrestrial ionosphere frequently measure turbulent plasma waves, especially during geospace storms. The non‐linear behavior of these waves remains poorly characterized. This paper presents the first fully kinetic 3‐D particle‐in‐cell simulations of Farley–Buneman (FB) turbulence spanning an entire high ...
Meers Oppenheim, Y. Dimant, R. Koontaweepunya, A. Q. Green, S. Evans   +4 more
wiley   +1 more source