The phenomenon of the equatorial counterelectrojet current (CEJ) is st
udied utilizing the D, H, and Z components of the magnetic field at a
chain of geomagnetic observatories in the Indo-Russian zone extending
from 0 to 75-degrees N magnetic dip. Very significant changes in both
H and D components are shown to occur on CEJ days at all stations even
north of Sq focus. The current system associated with CEJ consists of
two vortices, one counterclockwise in the morning and another clockwi
se in the evening hours. The counterelectrojet events during December
solstices seem to be associated with the disappearance of the Sq curre
nt loop in the Indo-Russian sector and on a number of consecutive days
. The cause of the counterelectrojet is suggested to be the changes in
various modes of the tidal movements in the upper atmosphere.