Depth of the nonconducting layer at the Nigerian dip equator

Details Depth of the nonconducting layer at the Nigerian dip equator Depth of the nonconducting layer at the Nigerian dip equator

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.5523d&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 88, July 1, 1983, p. 5523-5527. Research supported by the Consejo Naciona

Physics

6

Diurnal Variations, Equatorial Electrojet, Geomagnetism, Ionospheric Conductivity, Current Density, Least Squares Method, Nigeria, Parameterization

Scientific paper

The geomagnetic daily variations at the Nigerian dip equator are analyzed to find the thickness of the nonconducting layer in this zone. To do so, the external current system was determined from the external part of the geomagnetic daily variations by using a method discussed in a previous work. The field induced by this system was calculated assuming a two-layer model for the earth conductivity. Fitting this induced field to the internal part of the geomagnetic daily variations yielded a thickness of 500 km for the nonconducting layer in the interval of 100 km south to 500 km north of the dip equator. However, there is evidence showing a latitudinal gradient in the thickness south of this interval.

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