Physics
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.1181h&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, Feb. 1, 1992, p. 1181-1192.
Physics
47
Equatorial Electrojet, Ionospheric Drift, Plasma Dynamics, Diurnal Variations, E Region, Electrodynamics, Evening, Ionospheric Currents
Scientific paper
The role of the equatorial E region in the electrodynamics of the evening ionosphere is examined. The influence and reaction of the electrojet current on the equatorial ionosphere at sunset are investigated using a field-line-integrated 1D electrodynamic model. The 1D time-varying model predicts the divergence of the horizontal current of the equatorial electrojet for a given time variation of the horizontal electric field. The negative divergence of the horizontal current during the evening hours provides a net upward current out of the equatorial E region into the integrated ionosphere of higher equatorial altitudes and equivalent latitudes. This upward current affects the vertical electric field magnitudes and subsequent horizontal plasma drifts of the overlying ionosphere. It is proposed that the equatorial electrojet current near sunset has a significant role in the determination of the postsunset enhancement of the horizontal electric field.
Eccles Vincent J.
Haerendel Gerhard
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