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Longitudinal Variability of the Vertical Drift Velocity Inferred from Ground-Based Magnetometers and c/NOFS Observations in Africa

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International Journal of Geosciences 2022年第8期13卷 657-680页

作者： Messanga Etoundi Honoré Paul Obiakara Amaechi Augustin Daïka Diaby Kassamba Abdel Aziz Mohamed Kaab césar biouele mbané Zouhair Benkhaldoun Department of Geomatics Higher Technical Teacher Training College of Ebolowa University of Ebolowa Ebolowa Cameroon Applied Biotechnology and Engineering Laboratory Higher Technical Teacher Training College of Ebolowa Ebolowa Cameroon Laboratory of Earth’s Atmosphere Physics Faculty of Science University of Yaoundé 1 Yaoundé Cameroon cardiff School of Education & Social Policy Cardiff Metropolitan University Cyncoed Campus Cardiff UK Department of Meteorology and climatology National Advanced School of Engineering University of Maroua Maroua Cameroon Laboratoire de Physique de l’Atmosphère UFR-SSMT Université Félix Houphou&#235 t Boigny Abidjan C&#244 te d’Ivoire Oukaimeden Observatory LPHEA FSSM Cadi Ayyad University Marrakech Morrocco National School of Applied Sciences of Beni Mellal Sultan Moulay Sliman University Beni Mellal Morocco

This study aims at discussing longitudinal effects on the variability of the vertical E × B drift velocity at low latitudes, specifically over African sector. To this effect, observations from ground-based magnetometers and the Ion Velocity Meter experiment onboard c/NOFS satellite are analyzed in conjunction with equatorial electric field and neutral wind model estimates under geomagnetically quiet conditions in the years 2012-2013. Notwithstanding the limitation in data over Africa, the combination of ground-based and in-situ observations confirmed the existence of longitudinal differences in the E × B between the Atlantic, Western and Eastern African sectors. This was well reproduced by the equatorial electric field model (EEFM) which showed that during noon, the peak of the equatorial electric field (EEF) was the lowest in the Atlantic sector, with an increasing trend towards the Eastern longitude. The Horizontal Wind Model 14 (HWM14) showed that the eastward zonal (poleward meridional) wind velocity was the lowest (highest) in the Eastern sector. Furthermore, the zonal (meridional) wind increased (decreased) from the Eastern to the Atlantic sector. These results highlight the contribution of the neutral wind velocity in driving the longitudinal difference in the vertical drift velocity over Africa.

关键词： Equatorial Electrojet Vertical Drift Velocity (E × B) Longitudinal Variability African Sector

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