Active Region and Sunspot observed by SUMER on 25.Nov.96

This is another example of SUMER producing a 2-dimensional image of the Sun by staring at a meridian and letting the Sun rotate underneath. The image above was put together from 291 exposures of 105 seconds each, taken in a broad wavelength band including the Oxygen I emission line at 1302 Å (lower transition region, 13 000 K temperature).

The image includes parts of a sunspot and of an active region located at the central meridian just south of the Solar equator; for a localization please compare the full disk picture of a ground based observatory. - Since the SUMER pixel sizes differ in the two dimensions with this kind of sampling, the image is streched approx. three times out of proportion.

The images below show intensity, shift and width of the O I line in the right scale. Please note the slight blueshift over the sunspot in the Doppler image, as well as the line broadening over the bright spots and the relatively narrow line width over the sunspot.

IED, 06.Feb.97