Physics
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jatp...54..871s&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 54, no. 7-8, July-Aug. 1992, p. 871-880.
Physics
3
Equatorial Electrojet, Magnetic Effects, Magnetic Equator, Geomagnetism, Secular Variations
Scientific paper
Geomagnetic data are examined emphasizing results relevant to the dip equator and the axis of the electrojet. The data are taken from a 1971 geomagnetic survey, a 1980 magnetometer array experiment, and recent data on the ground magnetic data (H component) and Sq observations. The continuing southward migration of the magnetic dip equator is shown to move at 1-6 km/yr in the 1970s and at about 7 km/yr in the 1980s. The mean axis of the equatorial electrojet is located north of the dip equator, and Sq(Z) values of 25 nT are noted on the dip equator itself. Also given are values for the half-width and midday-peak total current intensity of the electrojet based on H data and an assumed uniform west-east current-band model. The data presented are significant revisions of earlier determinations since they incorporate severe induction anomalies and more complete data.
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