SUMER study #1297: Quiet Sun oscillations
- date, time: 01.May.97, 00:04 - 09:03 UT
- field of view: 0 - 84 arcsec W, 150 arcsec S - 150 arcsec N
- slit: 1.0 arcsec x 300 arcsec (number 2)
- raster step size: 0.0 arcsec (0 elementary steps)
- exposure time: 29 seconds (every 33 seconds)
- telemetry: 4(windows)*969 images of 25 spectral x 360 spatial pixels
(format 12)
- compression: quasilog-min-max (method 5)
- wavelength (e.g.): 1309.28 Å on reference pixel 751 of Detector B
- rotation compensation: 0.75 arcsec after 286.388 seconds
- binning: no spectral, no spatial
- on-board flat field correction: yes
Remarks: The study was initiated by K. Muglach (AIP). Details have been
published by K. Muglach, B. Fleck: Waves in the quiet Sun's chromosphere.
1999, ESA SP-446 (Proc. 8th SOHO Workshop), 499-502.
line = *, continuum = +
Si II 1309.28 (14 000 K)
continuum and line intensity, line shift and width
Spectral correction
Line shifts in the spectral regime caused by thermal deformations in the optical
bench of SUMER.
The long periodic contribution (approx. 2 hours) is correlated with the cycle
of the thermal control. Details have been published by J. Rybak,
W. Curdt, A. Kucera, U. Schühle, H. Wöhl: Chromospheric and transition region
dynamics - Reasons and consequences of the long-period instrumental periodicties
of SUMER/SOHO. 1999, ESA SP-448 (Proc. 9th European Meeting on Solar Physics),
361-366. The small additional oscillation is caused by the heater
duty cycle (default = 10 minutes).
IED, 25.Aug.00