This page (revision-5) was last changed on 07-Mar-2022 14:41 by Peter Young

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Version Date Modified Size Author Changes ... Change note
5 07-Mar-2022 14:41 4 KB Peter Young to previous Added bakeout section
4 13-Aug-2019 23:37 3 KB Peter Young to previous | to last
3 13-Aug-2019 23:30 3 KB Peter Young to previous | to last
2 13-Aug-2019 23:26 3 KB Peter Young to previous | to last
1 13-Aug-2019 23:07 3 KB unknown to last

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At line 3 added 4 lines
!!Start of science operations (Nov 2006)
The first science raster taken by EIS was on 23 Nov 2006 at 13:14 UT (the study "JTM004"). Prior to that, various test observations had been run, beginning on 27 Oct.
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!!Less frequent planning (Mar 2008, Dec 2014)
A consequence of the X-band failure is that Hinode planning switched from daily (Mon-Sat, with Sunday off) to three times a week (uploads on Tue, Thu & Sat) from about 20 March 2008 onwards. This impacted the ability to observe transient events, particularly flares.
In an effort to cut operations costs, "focused mode" operations began in December 2014. For these an entire 7-day plan is loaded on Saturdays. This only occurs during the Hinode and IRIS eclipse seasons (approx April-August and Oct-Feb, respectively), and only for selected weeks.
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!!CCD bakeouts (2016 onwards)
The EIS team avoided doing CCD bakeouts (which are common with EUV and X-ray instruments) due to concerns about whether they would affect the instrument calibration. However, bakeouts were finally performed in an effort to halt the continuous rise in the number of warm pixels on the EIS CCDs. The CCD manufacturer suggested a bakeout may reset the warm pixels.
Bakeouts were performed on 23-Feb-2016, 10-Aug-2017 and 17-Jan-2018. However, they did not have a significant impact on either the warm pixels or the calibration.
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!!Attitude control system problem (Dec 2021)
Beginning on 28 December 2021, a problem with the Hinode attitude control system has stopped all Hinode science operations. EIS observations resumed on 1 March 2022, but uncertainties remain over whether Hinode can maintain a stable roll angle. The effects of this on EIS data are being assessed.
This page (revision-5) was last changed on 07-Mar-2022 14:41 by Peter YoungTop