This page (revision-7) was last changed on 18-Apr-2021 19:18 by MichaelMarsh

This page was created on 14-Jun-2007 12:02 by PeterYoung

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PointingStability

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At line 1 added 2 lines
[{ALLOW edit EISMainUsers}]
[{ALLOW view Anonymous}]
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''Note that this means sit-and-stare observations with EIS are not recommended!''
''Note that this means sit-and-stare observations with EIS are not recommended!'' It is preferably that you use small rasters (5-10 mirror positions) so that you generate small images that can be cross-correlated with each other.
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! EIS Pointing Jitter
Following on from what was mentioned at the EIS UK meeting in July...
Here is an example of the apparent pointing jitter that appears in the y-axis. The effect of the orbital pointing drift appears visible as a slow variation throughout the observations. However, an additional jitter appears as a kind of "sawtooth" oscillation in the y-axis with a period of around 3-4 minutes. This could have a big effect on sit-and-stare Doppler observations, where there is a velocity gradient across the slit.
These pointing offsets were produced by performing a 2D cross-correlation on a Mg VII 278 slot movie, and the x-axis has units of seconds.
[y_cc_offset_r00-02.pdf]
Mike Marsh
This page (revision-7) was last changed on 18-Apr-2021 19:18 by MichaelMarshTop