Physics
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993angeo..11..273r&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 11, no. 4, p. 273-282.
Physics
2
Diurnal Variations, Earth Ionosphere, Electrojets, Geomagnetism, Magnetic Anomalies, Electric Fields, Latitude, Solar Terrestrial Interactions
Scientific paper
During the month of December 1975, when the mean solar daily variation of geomagnetic horizontal intensity was the lowest, an abnormally large number of days had reversed counter electrojet current features at Indian longitudes. The electrojet current is shown to be a system fairly independent of the general Sq current system. Latitudinal profiles of Delta H and Delta Z are described which do not always conform to the current system of normal or counter electrojet and present complex mixtures of the Sq and equatorial electrojet current systems. A new current loop during a counter equatorial electrojet day, when a westward current at low latitudes is associated with an eastward current at latitudes higher than 12 dip latitude, is suggested to be superposed over the normal Sq current system. It is suggested that these complex structures of low latitude current systems are the result of various tidal modes of atmospheric oscillations.
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