This page (revision-13) was last changed on 07-Dec-2016 14:14 by JianSun

This page was created on 25-Sep-2007 17:35 by JianSun

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At line 60 added 36 lines
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Hi David,
Your comments are valuable. Thanks.
I don't think [EIS_PREP|~DataAnalysisRoutines] corrects these offsets, people have to do it by themself manually.
Here’s a summary:
1. The pointing information in eis fits header is for LW CCD only.
{{{Note that the heliocentric coordinates stored in the fits headers and returned
by the EIS software apply to the long wavelength band, not the short wavelength band.
This is because the He II 256 line was used to co-align with the SOT data.}}}
2. Images on SW CCD are 16-20" (or pixels) higher (ie. in %%(color:#990000;)Y-direction%% towards north pole) than LW CCD.
{{{This may vary with wavelength}}}
3. Images on SW CCD are 2" (or pixels) righter (ie. in %%(color:#990000;)X-direction%% towards solar-west limb) than LW CCD.
{{{The fact is that the two CCD images arise from different halves of the primary mirror.
The focal points of the two mirror halves could thus be different.}}}
There is a preliminary report from Deb (MSSL) to show the shifts between SW & LW CCDs and XRT. The fits file has 22 lines: 8 lines in SW CCD and 14 lines in LW CCD:
Y shifts (arcsec):
_[20,20,20,20,20,19,19,19_] (SW)
[4,2,2,2,3,0,0,1,1,1,0,0,0.5,3] (LW)
X shifts (arcsec):
[0,0,0,0,0,0,0,0.5] (SW)
[3,3,1,1,1,3,0,1,1,2,3,3,2,1] (LW)
This page (revision-13) was last changed on 07-Dec-2016 14:14 by JianSunTop