Physics
Scientific paper
Mar 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976p%26ss...24..203k&link_type=abstract
Planetary and Space Science, vol. 24, Mar. 1976, p. 203-213.
Physics
3
Auroral Electrojets, Current Distribution, Earth Magnetosphere, Field Aligned Currents, Ionospheric Currents, Magnetic Fields, Satellite Observation, Alignment, Geomagnetism, Magnetic Disturbances, Magnetic Recording, Polar Substorms
Scientific paper
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 analyzed. It is shown that an intense upward field-aligned current flows out from the region of the westward electrojet where discrete auroras are located. The downward flowing current exists in the region further equatorward, namely, in the region of the eastward electrojet. However, the downward current is present even when there is no eastward electrojet. The boundary between the upward and the downward currents coincides, in most cases, with the boundary between the westward and the eastward auroral electrojets. Thus, the Harang discontinuity, a narrow area separating the positive and negative H bays, is the region where there is no field-aligned current.
Akasofu Syuh-Ichi
Kamide Yohsuke
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