Left: the solar disk as seen on the CCD shown with the black curve. The raw shape of the SODISM II image (solar radius at a given angle minus its lowest value) is represented with the blue curve. The scale is amplified by a factor of 1000. The three stellar angular calibrations (AC) that have been performed are represented by star symbols. The SODISM II plate-scale also depends on the shape of the image. Right: average limb position vs. central angle plotted in pixel units. The shape of the image corresponds to a SODISM II optical default (astigmatism). This shape does not change significantly over time (few mas).
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