Physics
Scientific paper
Apr 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.1493s&link_type=abstract
Journal of Geophysical Research, vol. 83, Apr. 1, 1978, p. 1493-1502. Navy-supported research
Physics
5
Auroral Zones, Magnetic Disturbances, Polar Regions, Satellite Observation, Electron Precipitation, Field Aligned Currents, Geomagnetism, Interplanetary Magnetic Fields, Magnetic Measurement, Magnetic Variations, Spatial Distribution
Scientific paper
Consideration is given to small-scale magnetic disturbances observed in the north and south auroral regions and in polar regions by the Triad satellite. Unlike magnetic variations corresponding to large-scale auroral field-aligned currents, the disturbances are smaller in amplitude and show finer-scale variations. The small-scale disturbances are often found in the polar cap region (poleward of large-scale field-aligned currents) and superimposed upon the magnetic signature of the large-scale currents. The small-scale variations are observed even during extreme geomagnetic quiet and when the large-scale field-aligned currents disappear. The small-scale variations are transverse to the main geomagnetic field and occur most frequently in the morning sector. The frequency of their occurrence is associated with the azimuthal direction of the interplanetary magnetic field. It is suggested that there is a direct connection between the magnetic field lines of the earth and the solar wind, and that there is a field-aligned flow of charged particles in the polar regions on 'open' field lines.
Iijima Toru
Potemra Thomas A.
Saflekos Nicholaos A.
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