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| Titel |
Equatorial night-time F-region zonal electric fields |
| VerfasserIn |
S. S. Hari, B. V. Krishna Murthy |
| 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 ; 13, no. 8 ; Nr. 13, no. 8, S.871-878 |
| Datensatznummer |
250011961
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| Publikation (Nr.) |
 copernicus.org/angeo-13-871-1995.pdf |
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| Zusammenfassung |
| Night-time F-region vertical
electrodynamic drifts at the magnetic equatorial station, Trivandrum are
obtained for a period of 2 years, 1989 and 1990 (corresponding to solar cycle
maximum epoch), using ionosonde h'F data. The seasonal
variation of the vertical drift is found to be associated with the longitudinal
gradients of the thermospheric zonal wind. Further, the seasonal variation of
the prereversal enhancement of the vertical drift is associated with the time
difference between the sunset times of the conjugate E-regions (magnetic
field line linked to F-region) which is indicative of the longitudinal
gradients of the conductivity (of the E-region). The vertical drifts and
the causative zonal electric fields at Trivandrum are compared with those at
Jicamarca and F-region zonal electric field models. It is seen that the
night-time downward drift (as also the causative westward electric field) at
Jicamarca is greater than that at Trivandrum. The prereversal enhancement of the
drift is greater at Jicamarca than at Trivandrum during the summer and the
equinoxes, whereas during the winter the opposite is the case. |
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