Analysing Spatial and Temporal Variability of Solar Radiation Using Wavelet Spectrum Transforms: Case Studies from Nigeria and the United States. Nigerian Journal of Theoretical and Environmental Physics, [S. l.], v. 3, n. 3, 2025. DOI: 10.62292/njtep.v3i3.2025.86. Disponível em: https://njtep.nipngr.org/index.php/njtep/article/view/86. Acesso em: 12 oct. 2025.