Abstract
Using the Sq current profiles measured with rocket born magnetometer, off the coast of Peru, by Davis et al. ( J. geophys. Res. 72, 1845) comparison is made between measured and calculated profiles near noon on geomagnetic dip equator, and a mismatch is pointed out in the height pattern of Sq current. Theory is worked out to determine the eastward electric field ( E y ) with which computed j y (eastward current density) coincides with the observed one. It is found that the neutral wind plays very important rôle in keeping E y height-independent. E y is found to be about 0.6 mVm −1, ranging from 0.5 to 0.7 mVm −1 in some cases. Flow of meridional current is obtained and its effect on jet current construction is discussed.
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