The glory is an optical phenomenon which can be observed from the airplane or from a mountain, when the sun is in the back of the observer (http://en.wikipedia.org/wiki/Glory_%28optical_phenomenon%29). Very high angular resolution about the backscatter region (~177°-180°, corresponding to umu~0.998-1 if the sun is in the zenith) is required to resolve the glory (see mayer2007.pdf). Use rte_solver disort2 to simulate the glory at various wavelengths between 400 and 600 nm. What do you observe?

Hints:

• Use the libRadtran input file and the plotting script from exercise 6 to start.
• Look at exercise 8 to see how a cloud layer is defined in libRadtran.