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Observations of equatorial ionization anomaly over Africa and Middle East during a year of deep minimum


Bolaji, O and Owolabi, O and Falayi, E and Jimoh, E and Kotoye, A and Odeyemi, O and Rabiu, B and Doherty, P and Yizengaw, E and Yamazaki, Y and Adeniyi, J and Kaka, R and Onanuga, K, Observations of equatorial ionization anomaly over Africa and Middle East during a year of deep minimum, Annales Geophysicae, 35, (1) pp. 123-132. ISSN 0992-7689 (2017) [Refereed Article]


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Copyright 2017 the Authors. Licensed under Creative Commons Attribution 3.0 Unported (CC BY 3.0)

DOI: doi:10.5194/angeo-35-123-2017


In this work, we investigated the veracity of an ion continuity equation in controlling equatorial ionization anomaly (EIA) morphology using total electron content (TEC) of 22 GPS receivers and three ground-based magnetometers (Magnetic Data Acquisition System, MAGDAS) over Africa and the Middle East (Africa-Middle East) during the quietest periods. Apart from further confirmation of the roles of equatorial electrojet (EEJ) and integrated equatorial electrojet (IEEJ) in determining hemispheric extent of EIA crest over higher latitudes, we found some additional roles played by thermospheric meridional neutral wind. Interestingly, the simultaneous observations of EIA crests in both hemispheres of Africa-Middle East showed different morphology compared to that reported over Asia. We also observed interesting latitudinal twin EIA crests domiciled at the low latitudes of the Northern Hemisphere. Our results further showed that weak EEJ strength associated with counter electrojet (CEJ) during sunrise hours could also trigger twin EIA crests over higher latitudes.

Item Details

Item Type:Refereed Article
Keywords:ionosphere, electric fields and currents
Research Division:Physical Sciences
Research Group:Space sciences
Research Field:Mesospheric, thermospheric, ionospheric and magnetospheric physics
Objective Division:Environmental Management
Objective Group:Air quality, atmosphere and weather
Objective Field:Atmospheric processes and dynamics
UTAS Author:Bolaji, O (Dr Olawale Bolaji)
ID Code:123608
Year Published:2017
Web of Science® Times Cited:8
Deposited By:Mathematics and Physics
Deposited On:2018-01-15
Last Modified:2018-04-30
Downloads:97 View Download Statistics

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