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| Titel |
Observational evidence for the plausible linkage of Equatorial Electrojet (EEJ) electric field variations with the post sunset F-region electrodynamics |
| VerfasserIn |
V. Sreeja, C. V. Devasia, Sudha Ravindran, Tarun Kumar Pant |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 27, no. 11 ; Nr. 27, no. 11 (2009-11-10), S.4229-4238 |
| Datensatznummer |
250016706
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| Publikation (Nr.) |
 copernicus.org/angeo-27-4229-2009.pdf |
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| Zusammenfassung |
| 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. |
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