======Irradiance and radiance at surface below a water cloud with and without delta scaling======

Calculate the solar irradiance spectrum in the spectral range from 400nm -- 800nm. Use //rte_solver disort// with and without delta-scaling (//deltam on/off//). Assume that the cloud scattering phase function can be approximated by a Heney-Greenstein phase function (see [[teaching:radiative_transfer:legendre_hg|exercise 5]]), which is done in the libRadtran input file as follows: 
<file bash wc_hg.inp>
wc_properties hu    # parameterization for water clouds 
# wc_modify gg  set  0.86   # specify asymmetry parameter
# wc_modify tau set  10     # specify cloud optical thickness
</file>
The parameterization by Hu uses a Heney-Greenstein approximation for the phase function. Compare results with and without delta scaling. Calculate also the nadir radiance and check how much the radiance is influenced by delta-scaling.

How does the irradiance depend on the cloud optical thickness and on the asymmetry parameter?