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

This page was created on 22-Apr-2008 11:21 by PeterYoung

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Version Date Modified Size Author Changes ... Change note
5 07-Dec-2016 14:14 1 KB PeterYoung to previous
4 02-May-2008 03:55 2 KB David R Williams to previous | to last
3 02-May-2008 03:52 2 KB David R Williams to previous | to last Comment by David R Williams
2 01-May-2008 14:30 1 KB PeterYoung to previous | to last
1 22-Apr-2008 11:21 1 KB PeterYoung to last

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[{ALLOW edit EISMainUsers}]
[{ALLOW view Anonymous}]
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CCD size governs the field of view in Solar-Y. The CCD is 1024 pixels high, and one pixel corresponds to 1 arcsec. However, only the central 512 pixel band of the CCD is used for science observations and thus the field of view in Solar-Y is 512 arcsec. An upcoming software update will however enable the full 1024 pixel height of the CCD to be used for science observations, with the restriction that no more than a 512 pixel region can be observed in a single exposure. E.g., the EIS Chief Observer can choose to observe a 512 pixel region at the bottom of the CCD, and then adjust the pointing to observe a 512 pixel region at the top of the CCD.
CCD size governs the field of view in Solar-Y. The CCD is 1024 pixels high, and one pixel corresponds to 1 arcsec. Up until April 2008 only the central 512 pixel band of the CCD was used for science observations and thus the field of view in Solar-Y was 512 arcsec. Towards the end of April 2008, a software update was performed which enables the full 1024 pixel height of the CCD to be used for science observations with the restriction that no more than a 512 pixel region can be observed in a single exposure. E.g., the EIS Chief Observer can choose to observe a 512 pixel region at the bottom of the CCD and then adjust the pointing to observe a 512 pixel region at the top of the CCD, but the complete 1024 pixels can not be observed in a single exposure.
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A word of caution, though. Some large rasters performed with the 40" slit have demonstrated that the fine motion mechanism seems to 'stick' at the ends of the range thus EIS is not actually accessing the extreme ends of the field of view. This effect is being investigated with the likely result being that the allowed range of the mechanism will be reduced by around 50".
A word of caution, though. Some large rasters performed with the 40" slit have demonstrated that the fine motion mechanism seems to 'stick' at the ends of the range thus EIS is not actually accessing the extreme ends of the field of view. This occurs for all slits, not just the 40".
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Peter Young
For designing EIS studies, users are requested to subtract 50" from the field of view values above to prevent this problem.
This page (revision-5) was last changed on 07-Dec-2016 14:14 by PeterYoungTop