Solar quiet day ionospheric source current in the West African region

The solar quiet (sq) day source current were calculated using the magnetic data obtained from a chain of 10 magnetotelluric stations installed in the african sector during the french participation in the international equatorial electrojet year (ieey) experiment in africa. the components of geomagnetic field recorded at the stations from january–december in 1993 during the experiment were separated into the source and (induced) components of sq using spherical harmonics analysis (sha) method. the range of the source current was calculated and this enabled the viewing of a full year’s change in the source current system of sq.