Browsing by Author "Lawal, S. K."

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    Effect of solar wind pressure on geomagnetic northward component over some selected low-latitude African stations
    (FUW Trends in Science & Technology Journal, 2023-03-18) Bello, S.A.; Yusuf, K. A.; Agbaje, P.; Shehu, S. J.; Lawal, S. K.; Oyinkanola, L. O. A.; Oladipo, M.
    The geomagnetic field is a magnetic field that extends into space, interacting with the solar wind, a stream of charged particles emanating from the sun. The geomagnetic (H) component data used for this project were obtained from Magnetic Data Acquisition System (MAGDAS) magnetometer at five different stations in Africa covering magnetic latitudes (MLAT) from 21.13⁰ in the northern hemisphere to -39.21⁰ in the southern hemisphere and magnetic longitude (MLON) between 69° to 120° The stations are Fayum, Egypt (21.13° MLAT, 102.38° MLON), Ilorin, Nigeria (-1.82° MLAT, 76.80° MLON), Hermanus, South Africa (-42.29° MLAT, 82.20° MLON), Dal Es Salaam, Tanzania (-16.26° MLAT, 110.59° MLON), Abidjan, Ivory Coast (6.32° MLAT, 69.23° MLON). The daily variation of the geomagnetic H component (ΔH) is calculated by subtracting the baseline values. The baseline value is the average value of the nighttime flanking hours. The study examines the effect of solar wind pressure on geomagnetic fields across different hemispheres at different seasons. The outcomes of this study demonstrate geomagnetic disturbances of hemispheric asymmetry which varies with seasons for some selected African stations. After a close study of low-latitude geomagnetic disturbances caused by solar wind pressure enhancements, it is found that there is a significant hemispheric asymmetry of the geomagnetic disturbances and that this hemispheric asymmetry depends on the season and interplanetary magnetic field (IMF) orientation.
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    Investigation of Earth Dam Seepage using Geo-resistivity Modelling: A Case of Asa Dam, Ilorin-Nigeria
    (Nigerian Association Mathematical Physics, 2014-11) Lawal, S. K.; Nwankwo, L. I.; & Lawal, T. O.
    A geo-resistivity modelling has been applied in the investigation of seepage around Asa Earth Dam in Ilorin, Nigeria. The electrical resistivity data were acquired using Wenner configuration. The resistivity values in the survey area vary between 0.05 and 1800 ohm-meter and also suggest two geo-electrical layers: a conductive layer interpreted to be caly/wet-to-moist sand, and a more resistivity layer interpreted to be granite intrusions characteristic of ilorin city. The results further propose anomalous conductive zones within the substance, which have lateral extension and therefore interpreted as potential pathways for water seepage from the dam.