E. O F, O. S B. Variations of time derivatives of the horizontal geomagnetic field and horizontal geomagnetic field along 96-degree magnetic meridian. CJPL [Internet]. 2016 Aug. 24 [cited 2024 Jul. 18];4(1). Available from: https://journals.covenantuniversity.edu.ng/index.php/cjpls/article/view/269