Inter-relationships Between the Thickness, Width and Intensity of the Equatorial Electrojet in Indian Sector (P38)

Details Inter-relationships Between the Thickness, Width and Intensity of the Equatorial Electrojet in Indian Sector (P38) Inter-relationships Between the Thickness, Width and Intensity of the Equatorial Electrojet in Indian Sector (P38)

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ihy..worke.130r&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 thickness, width and current intensity of the equatorial electro-jet over the Indian sector have been evaluated from Onwumechili’s thick current shell format of continuous current distribution model of equatorial electro-jet on quiet condition. 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 EEJ intensity increases from dawn, reaches a peak at about local noon, and thereafter decays towards sunset. The thickness and width of equatorial electro-jet EEJ exhibit consistent diurnal variations. The thickness decreases from about 0.06642º at dawn to the minimum at about 1100 hr local time and then begins to increase towards the dusk. The width increases with the sunrise, reach a maximum at about 1100 hr local time and then begin to decrease towards the dusk. The mean annual half thickness and half width for the solar minimum year 1986 (Sunspot number R = 13.4) is 0.0625 + 0.0037º and 2.68 + 0.23º, respectively. The dynamics of the variation of electro-jet intensity and thickness shows that the electro- jet shrinks as its intensity increases. The thick current shell model is shown to give better hourly representation of jet behavior than the thin shell format hitherto being used. 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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