1. Department of Physics, Federal University Oye-Ekiti, Oye Ekiti, Nigeria
2. Department of Physics, Federal University of Technology, Akure, Ondo State, Nigeria
3. Department of Electrical and Electronics Engineering, Manchester Metropolitan University, Manchester, UK
4. Department of Physical Sciences, Faculty of Natural Sciences, Ajayi Crowther University, Nigeria
5. German Research Centre for Geosciences Helmholtz-Zentrum, Deutsches Geoforschungs Zentrum (GFZ), Department of Geodesy and Remote Sensing, Potsdam, Germany