Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-04-10
Astronomy and Astrophysics
Astrophysics
Accepted for publication in ApJ
Scientific paper
10.1086/309336
We have investigated the effects of resonant scattering of emission lines on the image morphology and intensity from coronal loop structures. It has previously been shown that line of sight effects in optically thin line emission can yield loop images that appear uniformly bright at one viewing angle, but show ``looptop sources'' at other viewing angles. For optically thick loops where multiple resonant scattering is important, we use a 3D Monte Carlo radiation transfer code. Our simulations show that the intensity variation across the image is more uniform than the optically thin simulation and, depending on viewing angle, the intensity may be lower or higher than that predicted from optically thin simulations due to scattering out of or into the line of sight.
Raymond John
Wood Kenneth
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