The effect of the depth of the non-conducting layer on the induced magnetic field at the Peruvian dip equator.

Abstract

The internal part of the geomagnetic daily variations at the Peruvian dip equator shows the presence of an anomaly in the earth conductivity. This anomaly is further investigated in the present work using the external and internal parts of those variations, found in a previous work. The field induced at the ground by the current system determined from the external part is computed assuming a simple conductivity model. The depth of the non-conducting layer, p, is then found by fitting the results with the internal part. This procedure makes it possible to remove the usual assumption that the quotient between the internal and external parts of the planetary field is 0.4 and to find its actual value which, in the model, is a function of p.