Physics
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ang....38..315h&link_type=abstract
Annales de Geophysique, vol. 38, July-Sept. 1982, p. 315-320. Research supported by the Deutsche Forschungsgemeinschaft.
Physics
Current Density, Equatorial Electrojet, Geomagnetism, Ionospheric Currents, Magnetic Signatures, Magnetic Variations, Brazil, Diurnal Variations, E Region, Ionospheric Conductivity, Magnetic Equator, Wind Effects
Scientific paper
A total of 3400 sq km were covered during measurements of the horizontal components of the daily magnetic variations from 9 ground stations in northeastern Brazil. The stations were arrayed perpendicular to the magnetic equator, and data were gathered during the period May-Nov. 1971. Latitudinal hourly profiles of the 3 components of the daily magnetic variations were made on 13 quiet days. A persistent undulated shape oriented perpendicular to the magnetic equator was observed in the profiles and shown to be independent of the local ionospheric winds. It is suggested that the undulations are caused by the equatorial electrojet, with the mechanism consisting of a reduction of current density for a nondivergent current system. A relationship was analytically defined between the height-integrated current densities of the electrojet and the Sq current system. The relationship was used to describe the daily variations, and it was found that the Cowling conductivity is dependent on the current density.
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