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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The longitudinal variability of equatorial electrojet and vertical drift velocity in the African and American sectors
Annales Geophysicae, Volume 32, No. 3, Year 2014
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Description
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?©Author(s) 2014.
Authors & Co-Authors
Yizengaw, Endawoke
United States, Chestnut Hill
Boston College
Moldwin, M. B.
United States, Ann Arbor
University of Michigan, Ann Arbor
Zesta, Eftyhia
United States, Greenbelt
Nasa Goddard Space Flight Center
Biouele, C. M.
Cameroon, Yaounde
Université de Yaoundé I
Damtie, Baylie
Ethiopia, Bahir Dar
Bahir Dar University
Mebrahtu, Alem
Ethiopia, Adigrat
Adigrat University
Rabiu, A. Babatunde
Nigeria, Abuja
National Space Research and Development Agency
Valladares, C. E.
United States, Chestnut Hill
Boston College
Stoneback, Russell
United States, Richardson
The University of Texas at Dallas
Statistics
Citations: 98
Authors: 9
Affiliations: 8
Identifiers
Doi:
10.5194/angeo-32-231-2014
ISSN:
09927689
e-ISSN:
14320576
Study Design
Cohort Study