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Observational Evidence for the Plausible Linkage of Equatorial Electrojet (Eej) Electric Field Variations with the Post Sunset F-region Electrodynamics : Volume 27, Issue 11 (10/11/2009)

By Sreeja, V.

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Book Id: WPLBN0003986982
Format Type: PDF Article :
File Size: Pages 10
Reproduction Date: 2015

Title: Observational Evidence for the Plausible Linkage of Equatorial Electrojet (Eej) Electric Field Variations with the Post Sunset F-region Electrodynamics : Volume 27, Issue 11 (10/11/2009)  
Author: Sreeja, V.
Volume: Vol. 27, Issue 11
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: copernicus


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Pant, T. K., Ravindran, S., Devasia, C. V., & Sreeja, V. (2009). Observational Evidence for the Plausible Linkage of Equatorial Electrojet (Eej) Electric Field Variations with the Post Sunset F-region Electrodynamics : Volume 27, Issue 11 (10/11/2009). Retrieved from

Description: Space Physics Laboratory, Vikram Sarabhai Space Centre, Trivandrum 695022, India. The paper is based on a detailed observational study of the Equatorial Spread F (ESF) events on geomagnetically quiet (Ap≤20) days of the solar maximum (2001), moderate (2004) and minimum (2006) years using the ionograms and magnetograms from the magnetic equatorial location of Trivandrum (8.5° N; 77° E; dip lat ~0.5° N) in India. The study brings out some interesting aspects of the daytime Equatorial Electrojet (EEJ) related electric field variations and the post sunset F-region electrodynamics governing the nature of seasonal characteristics of the ESF phenomena during these years. The observed results seem to indicate a plausible linkage of daytime EEJ related electric field variations with pre-reversal enhancement which in turn is related to the occurrence of ESF. These electric field variations are shown to be better represented through a parameter, termed as E, in the context of possible coupling between the E- and F-regions of the ionosphere. The observed similarities in the gross features of the variations in the parameter E and the F-region vertical drift (Vz) point towards the potential usage of the EEJ related parameter E as an useful index for the assessment of Vz prior to the occurrence of ESF.

Observational evidence for the plausible linkage of Equatorial Electrojet (EEJ) electric field variations with the post sunset F-region electrodynamics

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