Morphology of Equatorial Electrojet over the West African Sector (P36)

Details Morphology of Equatorial Electrojet over the West African Sector (P36) Morphology of Equatorial Electrojet over the West African Sector (P36)

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ihy..worke.128r&link_type=abstract

2nd UN/NASA Workshop on International Heliophysical Year and Basic Space Science. Proceedings of the conference held 27 Novembe

Astronomy and Astrophysics

Astrophysics

Scientific paper

The temporal variations of the landmark and current parameters of the equatorial electro-jet over the West African sector have been evaluated from Onwumechili’s thick current shell format of continuous current distribution model of equatorial electro-jet using a set of data taken during the International Equatorial Electro-jet Year (IEEY). The thick current shell model which takes into account the vertical ionospheric currents permits both the width and the thickness of the jet to be determined simultaneously. The variations of the landmark and current parameters of equatorial electro- jet (EEJ) exhibit consistent diurnal variations. Generally, the EEJ intensity current parameters, including forward current and current density and current intensity increase from dawn, reach the peak at about local noon and thereafter decay towards sunset. The landmark parameters such as current width and latitudinal extent of the current also increase from dawn towards the local noon and thereafter begin to decrease towards sunset. The dynamics of the variation of electro-jet intensity and thickness shows that electro-jet shrinks as its intensity increases. The electro-jet centre has a consistent diurnal variation pattern and comes closer to the dip equator at about local noon when the intensity of the jet maximizes. The thin current shell model best fits only the near local noon jet observation, as the electro- jet is thinnest at the period of maximum intensity. The transient variation of the jet thickness is explained in terms of the wind shears in consistency with the electrodynamics of the dynamo region.

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