Nymphas, E., & Adeyemi, T. (2016). Variability of Sporadic-e (es) layer at two equatorial stations: Fortaleza (3os, 38ow) and Ilorin (8.5on, 4.5oe). Journal of Science and Technology, 34(3). https://doi.org/10.4314/just.v34i3.25