On 25.Jan.96, SUMER observed the Solar corona above the north pole in the emission line of Oxygen VI (1031.9 Å, temperature 300 000 K) with Detector B. Slit 1 (4.0 x 300 arcsec²) was used, but only a central part of the detector (120 arcsec in north-south extension) was transmitted; the exposure time was 10 seconds per raster step, the raster step size was 0.76 arcsec, 159 raster steps were performed, thus an area of 120 arcsec (east-west) x 120 arcsec (north-south) was covered in approx. 27 minutes.
Some flatfield-type image corrections were applied to the picture. There were no data faults. The figure above shows intensity values between 0.4 and 6.3 counts/s/arcsec²/line.
To give an impression of the location relative to the limb, the image below shows the corona scan together with the limb scan that was taken in the same coordinate range around the north pole approx. 2 hours earlier and approx. 200 arcsec further south. It has to be noted, of course, that the intensities are not on the same scale: the corona radiation is in the order of 40 times weaker in this example.
IED, 22.Jul.97