According to the information gathered in the FITS files, on 29.Feb.96, i.e. still in the commissioning phase, several Solar limb pictures were taken between 21:24 and 22:28 UT. Different exposure times, image formats, raster step sizes and repetitions were used; the images above were put together such that they are on the same scale.
The limb was scanned in continuum emission around 865 Å, its intensity ranging up to approx. 20 counts/s/arcsec²/Å. From the Solar coordinates transmitted in the image headers, it can be concluded that initially SUMER was not centered on the actual Solar center, but on a point approx. 70 arcsec east to this - so, first, the limb had to be found.
For the last two (narrow) pictures, the pointing had obviously been corrected; each covers an interval between 987 and 1002 arcsec, E and W of the Solar center resp., the limb appearing in the middle of both. This leads to a Solar radius of approx. 994 arcsec for the Solar disk visible in this radiation. - The north-south extension of the images is 120 arcsec, the Solar equator being in the middle.
IED, 30.Aug.97