At the upper surface of the Earth's atmosphere, the time-averaged magnitude of the Poynting vector, <S> = 1.35 x 10^3 W/m^2, is referred as the solar constant.
a) Assuming that the Sun's electromagnetic radiation is a plane sinusoidal wave, what are the magnitudes of the electric and magnetic fields?
b) What is the total time-averaged power radiated by the Sun? The mean Sun-Earth distance is R = 1.5 x 10^11 m.