Estimating daytime vertical ExB drift velocities in the equatorial F-region using ground-based magnetometer observations
Article first published online: 28 JUN 2002
Copyright 2002 by the American Geophysical Union.
Geophysical Research Letters
Volume 29, Issue 12, pages 37-1–37-4, June 2002
How to Cite
Estimating daytime vertical ExB drift velocities in the equatorial F-region using ground-based magnetometer observations, Geophys. Res. Lett., 29(12), doi:10.1029/2001GL014562, 2002., , , , and ,
- Issue published online: 28 JUN 2002
- Article first published online: 28 JUN 2002
- Manuscript Accepted: 28 MAR 2002
- Manuscript Revised: 20 MAR 2002
- Manuscript Received: 12 DEC 2001
 The daytime equatorial electrojet is a narrow band of enhanced eastward current flowing in the 100 to 120 km altitude region within ±2° latitude of the dip equator. A unique way of determining the daytime strength of the electrojet is to observe the difference in the magnitudes of the Horizontal (H) component between a magnetometer placed directly on the magnetic equator and one displaced 6 to 9 degrees away. The difference between these measured H values provides a direct measure of the daytime electrojet current, and in turn, the magnitude of the vertical ExB drift velocity in the F region ionosphere. This paper discusses a recent study that has established the quantitative relationship between the vertical ExB drift velocity in the ionospheric F region and the daytime strength of the equatorial electrojet in the South American (west coast) longitude sector.