Question

A. If the Sun subtends a solid angle Ω on the sky, and the flux from the Sun just above the Earth’s atmosphere, integrated over all wavelengths, is f(d¯), show that the flux at the Solar photosphere is πf(d¯)/Ω.
b. The angular diameter of the Sun is 0.57 degree. Calculate the solid angle subtended by the Sun, in steradians.

Answer 1

Answer: a) Fo = f(do)×3.142/ohm

b) 7.8×10^-5

Explanation: see attachment.