Question 3,4,5

SPECTRAL RADIANCE/IRRADIANCE FUNCTIONS

Fig. 1. Sun’s spectral irradiance from Fig. 2. Sun’s spectral irradiance from Earth above the atmosphere

Fig. 3. Spectral irradiance of stars Fig. 4. Spectral irradiance of planets

Fig. 5. Background radiance of diffuse sky from sea level, elevation angle 45 deg., no clouds

Fig. 6. Night time sky radiance

Fig. 7. Spectral Radiance of Earth from space