Resonant scattering of emission lines in coronal loops: Effects on image morphology and line ratios

We have investigated the effects of resonant scattering of emission lines o n the image morphology and intensity from coronal loop structures. It has p reviously been shown that line-of-sight effects in optically thin line emis sion can yield loop images that appear uniformly bright at one viewing angl e but show "looptop sources" at other viewing angles. For optically thick l oops where multiple resonant scattering is important, we use a three-dimens ional Monte Carlo radiation transfer code. Our simulations show that the in tensity variation across the image is more uniform than the optically thin simulation, and depending on viewing angle the intensity may be lower or hi gher than that predicted from optically thin simulations due to scattering out of or into the line of sight.