Results 231 to 240 of about 24,672 (257)

Field-aligned Currents in the Undisturbed Polar Ionosphere

pure and applied geophysics, 1989
Field-aligned currents, FAC’s, which couple ionospheric currents at high latitudes with magnetospheric currents have become an essential cornerstone to our understanding of plasma dynamics in the polar region and in the earth’s magnetosphere. Initial investigators of polar electrodynamics including the aurora were unable to distinguish between the ...
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The Auroral electrojet and field-aligned current

Planetary and Space Science, 1976
Abstract The location of field-aligned currents in the evening sector with respect to the auroral electrojets is examined. The tri-axial TRIAD satellite data and the simultaneous ground magnetometer data from along the Alaska meridian are analysed.
Y. Kamide, S.-I. Akasofu
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Field Aligned Currents in the Magnetosphere

1974
This paper deals with field aligned currents in general. Specific topics are: a brief review of the well established features; new results from the triaxial magnetometer experiment on the TRIAD satellite; comparison of the results from a variety of studies; relation of field aligned currents to other areas of research; and comments on future studies.
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Minimization of field-aligned current and flow

Journal of Plasma Physics, 2005
The radial profiles of current and flow permitted by the relaxed states of a two-fluid cylindrical plasma system using double Beltrami formulation are presented. The relaxed states are then compared with those of the internal conductor plasma configuration.
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Field-aligned currents in nonlinear auroral vortices

2023
Velocity shears at the boundary layer that forms between a planetary magnetosheath and its magnetosphere can serve as effective voltage generators driving field-aligned currents and powering auroral emissions. Previously, an analytic solution was developed for the field aligned currents and electron precipitation assuming a linear Knight relation as an
Johnson, J., Navarro, A., Wing, S.
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Closure of field-aligned currents in the ionosphere

Astrophysics and Space Science, 1981
The ionospheric currentsj⊥ closing the field-aligned currents (FACs) flow mostly along the auroral oval and connect dawn and dusk sides of the oval. The currentj⊥ has a significant component directed across the auroral oval in the immediate vicinity of the interface between the two regions of Iijima and Potemra (1976) only.
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Current Helicity and the Generation of Magnetic Field Aligned Currents

1991
Reliable magnetic field measurements are still restricted to the photosphere and information on chromospheric and coronal magnetic fields stems mainly from the extrapolation of measured photospheric fields. The comparison of extrapolated force-free magnetic fields with chromospheric and coronal observations indicates that in active regions the current ...
N. Seehafer, K.-H. Rädler
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Field‐Aligned Currents in the Magnetosphere–Ionosphere

2021
Field‐aligned currents play a major role in magnetized plasmas. They are the main agents for coupling the dynamics between magnetosphere and ionosphere. Perturbations of magnetic field distribution, plasma pressure or flow on one end are communicated by field‐aligned currents along the whole flux tube.
Lühr, H., Kervalishvili, G.
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The diurnal flow pattern of field-aligned currents

Journal of Geophysical Research, 1974
Gross characteristics of the vector magnetic field perturbations detected by the Triad satellite at 800-km altitude in the auroral oval are analyzed as a function of dipole local time (DLT) under a broad range of magnetic activity. The perturbations are always transverse to the main field and thus result from field-aligned currents.
A. J. Zmuda, James C. Armstrong
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Field‐aligned currents in the magnetospheric boundary layer

Journal of Geophysical Research: Space Physics, 1980
A self‐consistent magnetopause‐boundary layer model is constructed which contains two current layers, one for the magnetopause and one for the magnetosphere‐boundary layer transition region. Field‐aligned sheet currents in the boundary layer are generated by the plasma flow along the boundary layer.
L.C. Lee, J.R. Kan
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