The Longitudinal Variability of Equatorial Electrojet and Vertical Drift Velocity in the African and American Sectors

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The Longitudinal Variability of Equatorial Electrojet and Vertical Drift Velocity in the African and American Sectors

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Title: The Longitudinal Variability of Equatorial Electrojet and Vertical Drift Velocity in the African and American Sectors
Author(s):
Yizengaw, E.;
Moldwin, M. B.;
Zesta, E.;
Biouele, C. M.;
Damtie, B.;
Mebrahtu, A.;
Rabiu, B.;
Valladares, C. F.;
Stoneback, Russell A.
Date Created: 2014-03-13
Item Type: article
Keywords: Ionosphere
Ionospheric drift
Equatorial electrojet
Velocity
Abstract: 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 on-board 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?
Publisher: Copernicus Gesellschaft Mbh
ISSN: 0992-7689
Source: Annales Geophysicae
Link to Related Resource: http://dx.doi.org/10.5194/angeo-32-231-2014
Persistent Link: http://hdl.handle.net/10735.1/4034
Bibliographic Citation: Yizengaw, E., M. B. Moldwin, E. Zesta, C. M. Biouele, et al. 2014. "The longitudinal variability of equatorial electrojet and vertical drift velocity in the African and American sectors." Annales Geophysicae 32(3): 231-238.
Terms of Use: CC-BY 3.0 (Attribution)
©2014 The Authors
Sponsors: US National Aeronautics and Space Administration (LWS-NNX10AQ53G; LWS-NNX11AP02G; AFOSR-FA9550-12-1-0437)

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CC-BY 3.0 (Attribution) Except where otherwise noted, this item's license is described as CC-BY 3.0 (Attribution)