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Westward equatorial electrojet during daytime hoursThe phenomenon of the depression of the geomagnetic horizontal field during the daytime hours of magnetically quiet days at equatorial stations is described. These events are generally seen around 0700 and 1600 LT, being more frequent during the evening than the morning hours. The evening events are more frequent during periods of low solar activity and in the longitude region of weak equatorial electrojet currents. The latitudinal extent of the phenomenon is limited to the normal equatorial electrojet region, and on some occasions the phenomenon is not seen at both stations, separated by only a few hours in longitude. During such an event, the latitudinal profile of the geomagnetic vertical field across the equator is reversed, the ionospheric drift near the equator is reversed toward the east, the q type of sporadic E layer is completely absent, and the height of the peak ionization in the F2 region is decreased. It is suggested that these effects are caused by a narrow band of current flowing westward in the E region of the ionosphere and within the latitude region of the normal equatorial electrojet, due to the reversal of the east-west electrostatic field at low latitudes.
Document ID
Document Type
Reprint (Version printed in journal)
Rastogi, R. G. (Denver, University Denver, Colo.; Physical Research Laboratory, Ahmedabad, India)
Date Acquired
August 7, 2013
Publication Date
April 1, 1974
Publication Information
Publication: Journal of Geophysical Research
Volume: 79
Subject Category
Funding Number(s)
Distribution Limits