The Earth's atmosphere, integrated over all wavelengths, is f(do). Show that the flux at the solar photosphere is f(do)/S^2.
b. The angular diameter of the Sun is 0.57 degrees. Calculate the solid angle subtended by the Sun, in steradians. Answer: S = 7.8 x 10^-5.
c. The solar flux at Earth is f(do) = 1.4 x 10 erg s^-1 cm^-2 = 1.4 kW m^-2 of the Sun. Answer: TE = 5800 K.