This page (revision-3) was last changed on 07-Dec-2016 14:14 by PeterYoung

This page was created on 05-Jul-2007 17:18 by PeterYoung

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After inspecting various data-sets, an optimum position for the slit assembly was found and a permanent change was made on __24 August 2008__. Preliminary checks on the data suggest that the spatial offset between the two CCDs is now around 0.5 arcsec.
After inspecting various data-sets, an optimum position for the slit assembly was found and a permanent change was made on __24 August 2008__. Preliminary checks on the data suggest that the spatial offset between the two CCDs is now around 0.5 arcsec - see the image below.
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If you have made any measurements of the offset since 24 August 2008 and find a different value, please report it here.
[Image|CCDOffsetX/JS_CH_140x256p.jpg]
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Shown are images in Fe XIII 202.04 and Fe XIV 274.20, and a cut through the data is indicated by the dashed lines on the images. The bottom plot shows the cross sections for both lines, and cross-correlation gives a displacement of less than 1 pixel (0.45,0.39) as indicated in the legend.
If you have made any measurements of the offset since 24 August 2008 and find a different value, please report it here.
This page (revision-3) was last changed on 07-Dec-2016 14:14 by PeterYoungTop