Results 261 to 270 of about 177,034 (301)

Field‐Aligned Currents in Auroral Vortices

Journal of Geophysical Research: Space Physics, 2021
Abstract Auroral bright spots have been observed at Earth, Jupiter, and Saturn in regions that map to the magnetopause boundary layer. It has been suggested that the bright spots are associated with the Kelvin‐Helmholtz (KH) instability.
Jay R. Johnson, Simon Wing, Peter Delamere, Steven Petrinec, Shiva Kavosi   +4 more
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Field-Aligned (Birkeland) Currents

Space Science Reviews, 1985
Following earlier suggestions of Edmond Halley and Anders Celsius for the “magnetic behavior” of auroral phenomena, Kristian Birkeland discovered in his polar expeditions of 1902–03 that large-scale electric currents were associated with the aurora. He was also the first to suggest that these currents originated far from earth and that they flowed into
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Field‐aligned currents of postnoon auroral arcs

Journal of Geophysical Research: Space Physics, 2009
On 9 January 2008, postnoon (at about 15–16 magnetic local time [MLT]) poleward moving auroral arcs were observed over Svalbard during slightly negative interplanetary magnetic field (IMF) Bz and the IMF By gradually changing from near zero to about −3 nT.
Alexander Kozlovsky, Tauno Turunen, Stefano Massetti   +2 more
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Interhemispheric field‐aligned currents: Simulation results

Journal of Geophysical Research: Space Physics, 2014
AbstractWe present simulation results of the 3‐D magnetosphere‐ionosphere current system including the Region 1 and Region 2 field‐aligned currents, ionospheric currents, and interhemispheric field‐aligned currents flowing between the northern and southern conjugate ionospheres in the case of asymmetry in ionospheric conductivities in two hemispheres ...
Sonya Lyatskaya, George V. Khazanov, Eftyhia Zesta   +2 more
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Field-aligned currents in the magnetosphere

Journal of Geophysical Research, 1967
Certain satellite and terrestrial observations of transient magnetic fluctuations show a high degree of localization, while other observations are of a definite worldwide character. The worldwide fluctuations in the magnetic field are probably well explained in terms of hydromagnetic waves propagating through the magnetosphere in modes with the wave ...
W. D. Cummings, A. J. Dessler
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Field-aligned currents from asymmetric ring current during substorms

Advances in Space Research, 1996
Abstract First results of calculated distributions of field-aligned ion currents in the magnetosphere are given. The approach and equations developed by Gurevich and Tsedilina are applied. They were used for a previous estimation of electric fields in the ionosphere and magnetosphere, appearing in the process of the spreading of energetic particles ...
E.E. Tsedilina, N.V. Beliansky
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Finite geometry effects of field‐aligned currents

Journal of Geophysical Research: Space Physics, 1992
Traditionally, field‐aligned current densities calculated from gradients in the perturbation magnetic field measured from low‐altitude spacecraft have been based on the assumption that the current regions are infinite in length. However, many measurements clearly indicate that this assumption is invalid.
Shing F. Fung, R. A. Hoffman
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Field‐aligned currents in the Earth's magnetotail

Journal of Geophysical Research: Space Physics, 1981
Three field‐aligned current sheets are directly observed with plasma and magnetometer instrumentation on board the ISEE spacecraft located at ∼20 RE in the postmidnight sector of the magnetotail. These current sheets are encountered at the northern plasma sheet boundary as the plasma sheet expanded past the spacecraft positions during the recovery ...
L. A. Frank, R. L. McPherron, R. J. DeCoster, B. G. Burek, K. L. Ackerson, C. T. Russell   +5 more
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