Fluctuations of the auroral zone current system and geomagnetic pulsations

Details Fluctuations of the auroral zone current system and geomagnetic pulsations Fluctuations of the auroral zone current system and geomagnetic pulsations

Jul 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.2705w&link_type=abstract

Journal of Geophysical Research, vol. 82, July 1, 1977, p. 2705-2716.

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1

Auroral Zones, Current Sheets, Geomagnetic Pulsations, Ionospheric Currents, Magnetic Effects, Polar Substorms, Auroral Electrojets, Birkeland Currents, Frequency Response, Geomagnetism, Ground Stations, Magnetometers

Scientific paper

Recordings of Pi 1 and Pi 2 pulsations obtained on a short-distance network of magnetometer stations were used to investigate the relationship between fluctuations of the auroral zone currents and geomagnetic pulsations. During the early part of the substorm expansion phase the pulsations of the D and H components are decoupled from each other at all stations. Similarly, the pulsations of the D components are not significantly correlated at stations with separation distances of approximately 100 km. For this interval the pulsations of the H component are interpreted as being predominantly the magnetic effect of fluctuations of the auroral electrojet, and the pulsations of the D component as being a consequence of fluctuations of Birkeland sheet currents. The conclusion can be drawn from these observations that the Birkeland currents are not directly connected in the north-south direction. Thus a considerable east-west component of the currents is required in order to maintain current continuity in the ionosphere. These effects disappear in the late expansion phase and early recovery phase.

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