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The paper is based on a detailed observational study of the EquatorialSpread F (ESF) events on geomagnetically quiet (Ap≤20) days of thesolar maximum (2001), moderate (2004) and minimum (2006) years using theionograms and magnetograms from the magnetic equatorial location ofTrivandrum (8.5° N; 77° E; dip lat ~0.5° N) in India. Thestudy brings out some interesting aspects of the daytime EquatorialElectrojet (EEJ) related electric field variations and the post sunsetF-region electrodynamics governing the nature of seasonal characteristics ofthe ESF phenomena during these years. The observed results seem to indicatea plausible linkage of daytime EEJ related electric field variations withpre-reversal enhancement which in turn is related to the occurrence of ESF.These electric field variations are shown to be better represented through aparameter, termed as "E", in the context of possible coupling between the E-and F-regions of the ionosphere. The observed similarities in the grossfeatures of the variations in the parameter "E" and the F-region verticaldrift (Vz) point towards the potential usage of the EEJ relatedparameter "E" as an useful index for the assessment of Vz prior to theoccurrence of ESF

annales geophysicae

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