Estimation of Clear Sky Normal Irradiance over Northern Nigeria Atmosphere
Figure 4.
(a) shows monthly mean clear sky beam (rad_mb) and diffused radiation (rad_md). (b) shows monthly mean clear sky transmittances of water vapor (Tw), ozone (Toz), aerosols (Ta) and gas (Ta) in Yola for the period of 14 years(1983-1997).