SOHO/SUMER: Almost "last light"
"Ionization degree in filaments" was the last study run on SUMER before SOHO
was lost and recovered. After this study
ended on 22.Jun.98, the history memory was read out, the door was closed,
and SUMER was switched off until the next campaign.
But on 24.Jun.98, ground control lost contact with SOHO for about six weeks.
For a while, it was not clear if the instruments could be put to work again
after this unvoluntary hibernation (see
SOHO: What's New).
In Nov.98 we learnt that SUMER is studying the Sun again, working as
before.
This image could have been the sunset for SUMER on SOHO.
It was taken on 22.Jun.98, 11:29 UT, at the north-west Solar
limb: a six-second-exposure of a spectral window around Helium I 584, the last
image taken by the study described below.
SUMER study #1787: Ionization degree in filaments
- date, time: 22.Jun.98, 05:53 - 11:29 UT
- field of view: 574, 577, 580, 582, 585 arcsec W, 703 arcsec N - 823 arcsec N
- slit: 0.3 arcsec x 120 arcsec, centered (number 7)
- raster step size: 0.0 arcsec
- exposure time:
6 seconds (format 10)
100 seconds (format 4)
6 seconds (format 10)
- telemetry: 5 repetitions of
41 images of 50 spectral x 120 spatial pixels (format 10)
3(windows)*11 images of 1024 spectral x 120 spatial pixels (format 4)
41 images of 50 spectral x 120 spatial pixels (format 10)
- compression: quasilog-min-max (method 5)
- wavelengths:
584.334 Å on reference pixel 332 of Detector B (format 10)
910.000 Å on reference pixel 513 of Detector B (format 4)
1402.60 Å on reference pixel 561 of Detector B (format 4)
1300.90 Å on reference pixel 515 of Detector B (format 4)
584.334 Å on reference pixel 332 of Detector B (format 10)
- rotation compensation: standard
- binning: no spectral, no spatial
- on-board flat field correction: no
Remarks: The study was initiated by K. Bocchialini (IAS).
Spectral windows
IED, 25.Aug.98