Results 121 to 130 of about 232 (164)

Auroral particle precipitation and Birkeland Currents

Reviews of Geophysics, 1974
Correlated measurements that provide information on Birkeland (field aligned) currents are reviewed. Because of the obvious importance of field‐aligned electric fields with regard to Birkeland currents, the last section of the paper is devoted to a presentation of recent data on the observations of field‐aligned auroral electron fluxes and ...
openaire   +3 more sources

Mercury’s Birkeland current system

Advances in Space Research, 2004
Abstract A consideration is given to the generation of field-aligned currents under different solar wind conditions. The preliminary results from a set of resistive MHD calculations indicate that the field-aligned current system could be significantly changed by the orientation of the interplanetary magnetic field.
Ip, W., Kopp, A.
openaire   +2 more sources

Observations of birkeland currents

Space Science Reviews, 1975
Recent measurements of precipitating energetic particles and vector magnetic fields from satellites and sounding rockets have verified the existence of geomagnetically-aligned electric currents at high latitudes in the ionosphere and magnetosphere. The spatial and temporal configuration of such currents, now commonly called Birkeland currents, has ...
P. A. Cloutier, H. R. Anderson
openaire   +1 more source

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
openaire   +2 more sources

Birkeland Currents in the Earth’s Magnetosphere

Astrophysics and Space Science, 1988
As a result of his polar expeditions at the beginning of this century, Kristian Birkeland determined that intense ionospheric currents were associated with the aurora. Birkeland suggested that these currents originated far from the Earth and that they flowed ointo and away from the polar atmosphere along the geomagnetic field lines.
openaire   +1 more source

Alfvén waves and birkeland currents

Physica Scripta, 1995
Hannes Alfven developed concepts over a half-century ago that continue to influence and guide modern space plasma physics. He derived the guiding center approximation for determining the motion of charged particles in a magnetic field and introduced the idea of a partial ring current formed from trapped radiation in the Earth's magnetic field.
openaire   +1 more source

Birkeland currents associated with optical aurora

Advances in Space Research, 1999
Abstract The location and magnitude of Birkeland currents associated with auroras were determined from an analysis of electron and magnetometer data from the Freja satellite during auroral overpasses in northern Saskatchewan. The upward field-aligned currents connected directly with the optical aurora.
W. Guo, D.J. McEwen, J.H. Clemmons, H. Luehr   +3 more
openaire   +1 more source

Ionospheric effects of Birkeland currents

Reviews of Geophysics, 1971
Since Birkeland's observations of high‐latitude magnetic perturbations led him to postulate the existence of geomagnetically aligned electric currents, theoretical studies have led to a general understanding of the mechanisms that are capable of driving such currents, and of the processes associated with formation and control of current configurations.
openaire   +1 more source

Birkeland currents in the plasma sheet

Journal of Geophysical Research: Space Physics, 1993
A search was conducted for the signatures of Birkeland currents in the Earth's magnetic tail, using observed values of Bx and By from large sets of spacecraft data. The data were binned by x and y for −10 > xGSM > −35 and |yGSM| ≤ 20RE (≤ 30 RE for xGSM ≤ −25 RE) and in each bin their distribution in the (Bx, By) plane was fitted by least squares
Nikolai A. Tsyganenko, David P. Stern, Zerefşan Kaymaz   +2 more
openaire   +1 more source

Three‐dimensional observations of Birkeland currents

Journal of Geophysical Research: Space Physics, 1986
The dominant coupling between the ionosphere and magnetosphere is now understood to be Birkeland currents. During substorms the Birkeland current system in the midnight sector is generally interpreted as a cross‐tail current interruption and diversion along magnetic field lines to the conducting ionosphere, which carries the intensified auroral ...
J. N. Barfield, N. A. Saflekos, R. E. Sheehan, R. L. Carovillano, T. A. Potemra, D. Knecht   +5 more
openaire   +1 more source