Solar Irradiance Modelling

V S Rohini

Abstract: CTSI is the solar energy received on outer layer of earth (at 1AU distance from sun) in form of heat flux ( in various wavelength bands) measured in w/m^2. SSA is the area of vissible sunspot on photosphere of sun. B is the daily averged solar global magnetic field. The CTSI & SSA shows delay9 with respect to each other.27day running averaged values of CTSI, SSA, B for delayed events are suitably combined in solar irradiance modelling. Using solar data for cycles 21, 22, 23 about 6 modelling equations are developed for solar irradiance. The modelled equations very well predict solar irradiance (RAWCTSI) within an error limit of +/- 0.12 w/m^2.

Keywords: Sun, CTSI, SSA, Average solar magnetic field B, Delay