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

This page was created on 12-Nov-2009 15:08 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
13 07-Dec-2016 14:14 8 KB Peter Young to previous
12 20-May-2011 22:02 7 KB PeterYoung to previous | to last
11 29-Jul-2010 22:18 7 KB PeterYoung to previous | to last
10 09-Jul-2010 10:23 7 KB ViggoHanst to previous | to last
9 08-Jul-2010 15:35 7 KB PeterYoung to previous | to last
8 08-Jul-2010 15:34 7 KB PeterYoung to previous | to last
7 08-Jul-2010 15:04 6 KB PeterYoung to previous | to last
6 08-Jul-2010 14:54 6 KB PeterYoung to previous | to last
5 07-Jul-2010 19:21 6 KB PeterYoung to previous | to last
4 07-Jul-2010 18:23 6 KB PeterYoung to previous | to last
3 07-Jul-2010 18:17 6 KB PeterYoung to previous | to last
2 04-Feb-2010 18:50 4 KB PeterYoung to previous | to last
1 12-Nov-2009 15:08 1 KB PeterYoung to last

Page References

Incoming links Outgoing links
EISPointing
EISPointing

Version management

Difference between version and

At line 1 removed 2 lines
[{ALLOW edit EISMainUsers}]
[{ALLOW view Anonymous}]
At line 12 added one line
__%%(color:red;)Update%%__ It has been found that the coordinates returned by the EIS software can be incorrect by up to 30" in the Y direction during the eclipse season (May-August), due to a drift in the relative EIS-spacecraft pointing. The actual Y-coordinate will be up to +30" larger than the software coordinates given by the methods outlined below. A software fix for this effect is being worked on. The effect also currently affects planned pointings, such that an observation planned to be centered on an active region will actually be positioned up to 30" north of the active region center.
At line 15 removed one line
!!Improved EIS pointing information __%%(color:red;)Update%%__
At line 17 removed 18 lines
From 2014 a new EIS routine yields the spatial offset between EIS and AIA. It is called as
{{{
IDL> xy=eis_aia_offsets(date)
}}}
At present the correction needs to be applied manually to the pointing values described in the sections below. So, for example,
{{{
IDL> xcen=xcen+xy[0]
IDL> ycen=ycen+xy[1]
}}}
The EIS-AIA offsets are determined regularly by co-aligning EIS slot images with AIA images. They should lead to much-improved pointing accuracy, to the level of 5" or better. In particular, the large variations seen during the eclipse season are corrected for.
Note that the EIS-AIA offsets do not correct the short-term (orbit period) jitter of EIS, only the longer-term (~ days) pointing variation.
This page (revision-13) was last changed on 07-Dec-2016 14:14 by Peter YoungTop