A correlation between measured E-region current and geomagnetic daily variation at equatorial latitude.

The usual methods of separation of the geomagnetic daily variations into parts of external and internal origin at equatorial latitudes have been revised to remove any previous assumption about the internal current, so that the separation may be performed in a zone of anomalous earth conductivity.The resulting procedure has been applied to obtain the distribution of the ionospheric current from the external field, at the South American dip equator and the result has been compared with previous measurements of the E-region current.