 |
 |
Astron. Astrophys. 346, L69-L72 (1999)
3. Observations
The Si IV observations were performed on April 22, 1996 on a
quiet solar region. The 0.3 ![[FORMULA]](img52.gif)
120
arcsecond slit (oriented North-South) was positioned at disk centre,
and a raster of 39 by 120 arcseconds was performed, comprising 102
separate, 60-second exposures with a raster increment of 0.38
arcseconds East. Six spectral regions were obtained (each 2 Å
wide), centred on the theoretical wavelengths of the Si IV
emission lines; 815.05, 818.13, 1122.49, 1128.33, 1393.76 and
1402.77 Å. Standard SUMER software was used to correct for
non-uniform detector sensitivity as well as wavelength and spatial
distortions on the detector. Finally, the individual exposures for
each spectral region were averaged to maximize the signal-to-noise
ratios.
© European Southern Observatory (ESO) 1999
Online publication: June 17, 1999
helpdesk.link@springer.de