Geomagnetic and geoelectricvariations in the West African longitudes of the equatorial electrojet (EEJ)

Ten electromagnetic stations were set up as a coordinated programme for the International Equatorial Electrojet Year (IEEY) between November 1992 and November 1994 by a French Team. The stations occupied covered a distance of 1200 km from Lamto 6.2°N, 5.02°W in the South to Tombouctou 16.7°N, 3°W in the North. The stations are listed in Table 1 and Fig .1a. Similar experimentations were carried out in American and Asian sectors and over 200 stations were occupied across the dip equator. Simultaneous recordings of H, D, Z, Ex and Ey for the quiet days of May 1st and 2nd 1993 (A