Magnetotelluric Response Estimates under the Equatorial Electrojet in Brazil

Magnetotelluric responses of soundings under the equatorial electrojet in Brazil have been estimated for four distinct locations at the north and south of the Magnetic Equator. It has been observed that the effect of the concentrated ionospheric currents (electrojet) in equatorial zones is added to the electromagnetic data and act as source. The difference between daytime and nighttime data indicates that source boosted by the electrojet, mainly observed at daytime, provides better estimation of the earth response functions even for lower frequencies (<0.01Hz).