Properties of the quiet solar coronal transition region from full-Sun SoHO/SUMER S VI

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A series of full-Sun SoHO/SUMER observations of the quiet Sun in the transition region lines S VI 933 and 944 (as well as Ly epsilon) has been performed during year 1996. We use this unique data set to derive the opacity of the S VI lines by different methods (following Dumont et al. 1983), taking advantage from the availability of full-Sun data and
of the S VI doublet: 1. using the center-to-limb variations of S VI 933 radiance and peak spectral radiance, 2. using the center-to-limb variations of S VI 933 line width and radiance, and 3. using the S VI 944 - 933 radiance or spectral radiance ratio at disk center. We then deduce an average value for the density in the S VI emitting region (in the coronal transition region). By comparing this value to the average square density obtained by an Emission Measure analysis, we get a tentative estimate of the filling factor in this region.

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