Results 11 to 20 of about 614 (179)

Influences on the radius of the auroral oval [PDF]

Annales Geophysicae, 2009
We examine the variation in the radius of the auroral oval, as measured from auroral images gathered by the Imager for Magnetopause-to-Aurora Global Exploration (IMAGE) spacecraft, in response to solar wind inputs measured by the Advanced Composition ...
S. E. Milan, J. Hutchinson, P. D. Boakes, P. D. Boakes, B. Hubert   +4 more
doaj   +4 more sources

A radio oval above Earth's auroral oval. [PDF]

Sci Adv
Auroral kilometric radiation (AKR), Earth’s strongest radio emission, has long been associated with discrete auroras and electrons near a few kilo–electron volt (keV) range. However, auroras also occur in diffuse forms with broader electron energies, raising the question of why AKR has not been observed above diffuse auroras or linked to electrons ...
Wu S, Whiter DK, Lamy L, Taubenschuss U, Zarka P, Collet B, Wang X, Fischer G, Ning H, Chen Y, Wang M, Ye S, Yao Z, Kurth WS, Luan X.   +14 more
europepmc   +3 more sources

Problems with mapping the auroral oval and magnetospheric substorms. [PDF]

Earth Planets Space, 2015
Accurate mapping of the auroral oval into the equatorial plane is critical for the analysis of aurora and substorm dynamics. Comparison of ion pressure values measured at low altitudes by Defense Meteorological Satellite Program (DMSP) satellites during their crossings of the auroral oval, with plasma pressure values obtained at the equatorial plane ...
Antonova EE, Vorobjev VG, Kirpichev IP, Yagodkina OI, Stepanova MV.   +4 more
europepmc   +4 more sources

Wandering of the auroral oval 41,000 years ago. [PDF]

Sci Adv
In the recent geological past, Earth’s magnetic field reduced to ~10% of the modern values and the magnetic poles shifted away from the geographic poles, causing the Laschamps geomagnetic excursion, about 41 millennia ago. The excursion lasted ~2000 years, with dipole strength reduction and tilting spanning 300 years.
Mukhopadhyay A, Panovska S, Garvey R, Liemohn MW, Ganjushkina N, Brenner A, Usoskin I, Balikhin M, Welling DT.   +8 more
europepmc   +5 more sources

Auroral electrojet oval [PDF]

Earth, Planets and Space, 2014
The auroral electrojet is enhanced in the polar ionosphere associated with charged particle precipitation and field-aligned currents during substorms. In this paper the geometry of the elctrojet is determined by using the ionospheric equivalent current systems for every 5 minutes during March 18 and 19, 1978.
Chen, Geng-Xiong, Xu, Wen-Yao, Wei, Zi-Gang, Ahn, B. H., Kamide, Y.   +4 more
openaire   +1 more source

SuperDARN E-region backscatter boundary in the dusk-midnight sector – tracer of equatorward boundary of the auroral oval [PDF]

Annales Geophysicae, 2002
We compare the locations of the equatorward boundaries of SuperDARN E-region backscatter and Hb  emissions, focusing on the dusk-midnight sector of the auroral oval where the proton aurora is statistically located equatorward of the discrete ...
P. T. Jayachandran, P. T. Jayachandran, E. F. Donovan, J. W. MacDougall, D. R. Moorcroft, J.-P. St. Maurice, P. Prikryl   +6 more
doaj   +1 more source

Discontinuity in Jupiter's main auroral oval [PDF]

Journal of Geophysical Research: Space Physics, 2008
On the basis of a series of FUV Hubble Space Telescope images obtained between 1997 and 2007 it is shown that there is a segment of the main auroral oval where the emission drops significantly from a few hundreds to a few tens of kiloRayleigh, forming a discontinuity in the oval.
Radioti, Aikaterini, Gérard, Jean-Claude, Grodent, Denis, Bonfond, Bertrand, Krupp, N., Woch, J.   +5 more
openaire   +2 more sources

Correspondence between the ULF wave power spatial distribution and auroral oval boundaries

Solar-Terrestrial Physics, 2016
The world-wide spatial distribution of the wave power in the Pc5 band during magnetic storms has been compared with auroral oval boundaries. The poleward and equatorward auroral oval boundaries are estimated using either the British Antarctic Survey ...
Kozyreva O.V., Pilipenko V.A., Engebretson M.J., Klimushkin D.Yu., Mager P.N.   +4 more
doaj   +1 more source

Thermospheric vertical winds in the auroral oval/polar cap region [PDF]

Annales Geophysicae, 2002
Thermospheric mean vertical winds from high-resolution Fabry-Perot Spectrometer observations of the l630 nm emission (from ~ 240 km altitude), over a four year interval 1997–2000, from Mawson (67.6° S, 62.9° E, Inv 70.5° S) and Davis (68.6° S, 78.
P. A. Greet, P. A. Greet, P. A. Greet, J. L. Innis, J. L. Innis, P. L. Dyson   +5 more
doaj   +1 more source

Study of time- and distance-dependent degradations of network RTK performance at high latitudes in Norway

SN Applied Sciences, 2023
Article highlights Professional satellite positioning services in the vicinity of the auroral oval region are frequently degraded during night-time.
Knut Stanley Jacobsen, Nadezda Sokolova, Mohammed Ouassou, Anders Martin Solberg   +3 more
doaj   +1 more source