Global UV‐B flux (sum of direct and diffuse radiations) data at four wavelengths 280, 290, 300 and 310 nm are recorded at several locations in India as part of Indian Middle Atmosphere Programme (IMAP). The stations have been selected considering distinct geographic features and possible influence of atmospheric aerosols and particulates on the ground reaching UV‐B flux. Mysore (12.6°N, 76.6°E) has been selected as a continental station largely free from any industrial pollution and large scale bio‐mass burning.
An examination of the ground reaching UV‐B flux at Mysore shows a marked dirunal and seasonal asymmetry. This can be attributed to the seasonally varying atmospheric aerosols and particulates which influence the scattering of UV‐B radiation. The available parameterization models are used to reproduce the experimental UV‐B irradiance by varying the input parameters to the model. These results on the dirunal and seasonal variation of global UV‐B flux from experiment and models are discussed in this paper.
