The effect of source field geometry on the response function (AZ/OH), used in geomagnetic depth sounding to decipher lateral conductivity distribution within the earth is highlighted with the help of contour plots of OZ/OH ratios for day and nighttime short-period fluctuations recorded through a largescale magnetometer array operated in the equatorial region of southern India. The representation of the difference between day (non-uniform) and night (uniform) time ratios in terms of the spatial derivatives of source field suggests that the reduction in daytime OZ/OH ratios at stations close to the periphery of the electrojet is due to the mutual balance of external and internal parts in OZ. The reduction in daytime AZ/A.Hratios near the center of electrojet axis is interpreted to indicate the weakening of the intensity of induced currents due to the presence of second and higher order spatial derivatives in the non-uniform source field.
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