For a test with a computed 3D structure, we obtained an example snapshot
structure from H-G. Ludwig (Wedemeyer et al., 2004; Caffau et al., 2007) of a
radiation-hydrodynamical simulation of convection in the solar atmosphere. The
radiation transport calculations were performed with a total of
grid points in
,
, and
, respectively, for a total of
voxels, the periodic boundary conditions were set in the
(horizontal)
plane. The transport equation is solved
for
and
solid angle points, so that a total
of about
intensities are calculated for each iteration
and wavelength point. For the tests described here, we are only using the temperature-density
structure of the hydro model and ignore the velocity field for the simple tests
presented here. We set the continuum opacity proportional to the density
by choosing a rough temperature independent estimate for the Rosseland mean
opacity per unit mass of
cm
/g and parameterizing the line in the
same form as discussed above and in Paper II with a line total (wavelength
integrated) opacity of
times the local continuum and 32 wavelength
points distributed over the full line profile.