Part of the Solar Corona in O VI, observed by SUMER 26./27.Jan.96

Inner Solar Corona seen in the emission line of Oxygen VI at 1031.9 Å (transition region, temperature 300 000 K). The picture was put together from 18 horizontal raster scans in alternating directions, 2 long ones each at the N and S limb, and 7 short ones each at the E and W limb. The exposure time was 45 seconds per raster step. The picture is binned (4 arcsec into 1 pixel) in N-S-direction. The approximate size and place of the Solar disk is shown within the black rectangle.

Some image corrections were performed and most data faults were eliminated. No straylight correction was performed.

The brightest pixels correspond to an intensity of more than 10 counts/line/arcsec² (with a maximum of approx. 35 near the limb), while the average intensity of the scanned area is around 1.5 .

Spectral window

Shown is the spectral window on the detector (left), averaged over the E- and W-scans, and the average profile of the O VI line (right).

The image of the 300x4 arcsec² slit covers 281 local pixels in N-S-direction plus some stray light. The 50 spectral pixels each correspond to 0.0445 Å (1st order). The profile shows counts/pixel/s versus wavelength in Å.

IED, 24.May.96