This page (revision-5) was last changed on 07-Dec-2016 14:14 by PeterYoung

This page was created on 18-Apr-2008 10:23 by PeterYoung

Only authorized users are allowed to rename pages.

Only authorized users are allowed to delete pages.

Page revision history

Version Date Modified Size Author Changes ... Change note
5 07-Dec-2016 14:14 2 KB PeterYoung to previous
4 02-May-2008 11:59 2 KB PeterYoung to previous | to last
3 01-May-2008 15:49 2 KB PeterYoung to previous | to last
2 18-Apr-2008 10:29 2 KB PeterYoung to previous | to last
1 18-Apr-2008 10:23 2 KB PeterYoung to last

Page References

Incoming links Outgoing links

Version management

Difference between version and

At line 1 added 2 lines
[{ALLOW edit EISMainUsers}]
[{ALLOW view Anonymous}]
At line 3 changed one line
The EIS spectral images are not exactly aligned relative to the CCD and, for the SW band, images at shorter wavelengths are slightly higher on the CCD compared to longer wavelengths. The effect is small and, for example, for the Fe XII 186.88 and 195.12 lines it's less than 1 pixel. The effect is caused by the dispersion axis of the grating not being exactly aligned with the CCD axis and we refer to it here as the "spectrum rotation". This is different to the "slit tilt" which arises from a misalignment of the EIS slits relative to the CCD.
The EIS spectral images are not exactly aligned relative to the CCD and, for the SW band, images at shorter wavelengths are slightly higher on the CCD compared to longer wavelengths. The effect is small and, for example, for the Fe XII 186.88 and 195.12 lines it's less than 1 pixel. The effect is caused by the dispersion axis of the grating not being exactly aligned with the CCD axis (i.e., the grating is tilted) and we refer to it here as the "spectrum rotation". This is different to the "slit tilt" which arises from a misalignment of the EIS slits relative to the CCD.
At line 7 added 2 lines
Both the spectrum rotation and slit tilt were features of SOHO/CDS and the attached image (CCD.gif) produced for CDS illustrates what both effects do to the spectral images. Note that the spectrum rotation makes no contribution to the slit tilt.