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| Titel |
The longitudinal variability of equatorial electrojet and vertical drift velocity in the African and American sectors |
| VerfasserIn |
E. Yizengaw, M. B. Moldwin, E. Zesta, C. M. Biouele, B. Damtie, A. Mebrahtu, B. Rabiu, C. F. Valladares, R. Stoneback |
| 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 ; 32, no. 3 ; Nr. 32, no. 3 (2014-03-13), S.231-238 |
| Datensatznummer |
250121036
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| Publikation (Nr.) |
 copernicus.org/angeo-32-231-2014.pdf |
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| Zusammenfassung |
| While the formation of equatorial electrojet (EEJ) and its temporal
variation is believed to be fairly well understood, the longitudinal
variability at all local times is still unknown. This paper presents a case
and statistical study of the longitudinal variability of dayside EEJ for all
local times using ground-based observations. We found EEJ is stronger in the
west American sector and decreases from west to east longitudinal sectors.
We also confirm the presence of significant longitudinal difference in the
dusk sector pre-reversal drift, using the ion velocity meter (IVM)
instrument onboard the C/NOFS satellite, with stronger pre-reversal drift in
the west American sector compared to the African sector. Previous satellite
observations have shown that the African sector is home to stronger and
year-round ionospheric bubbles/irregularities compared to the American and
Asian sectors. This study's results raises the question if the vertical
drift, which is believed to be the main cause for the enhancement of
Rayleigh–Taylor (RT) instability growth rate, is stronger in the American
sector and weaker in the African sector – why are the occurrence and
amplitude of equatorial irregularities stronger in the African sector? |
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