J/A+A/531/A173 Spectroscopy of CaII-H line at solar limb (Beck+, 2011)
Spectroscopy at the solar limb.
I. Average off-limb profiles and Doppler shifts of Ca II H.
Beck C., Rezaei R.
<Astron. Astrophys. 531, A173 (2011)>
=2011A&A...531A.173B 2011A&A...531A.173B
ADC_Keywords: Sun ; Spectroscopy
Keywords: Sun: chromosphere - techniques: spectroscopic - methods: data analysis
Abstract:
We present constraints on the thermodynamical structure of the
chromosphere from ground-based observations of the CaII H line
profile near and off the solar limb.
Description:
The data used in the publication consist of a set of CaII H spectra
taken near and beyond the solar limb on 25/08/2009 at UT 08:43-09:15.
The data were obtained with the POLIS instrument at the German VTT.
The wavelength range covers the core and the blue wing of the CaII H
line from 396.332nm to 396.969nm in 326 steps of 1.96pm. The
observations were done by moving the solar image across the slit of
the spectrograph with a step width of 0.3-arcsec, yielding in total
134 slit spectra of 326 wavelength points on 244 CCD rows along the
slit. The spatial sampling along the slit was 0.3-arcsec. The center
of the field-of-view was located at (x,y)=(+37",+920") relative to the
center of the solar disk. The data have been corrected for stray-light
with the methods described in the article and are normalized to the
continuum intensity on disc center. The corresponding data file
data.fit is organized as floating array
(x,y,wavelength)=(134x244x326) pixels.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
data.fit 2880 14806 Reduced spectra in fits format (stored as
a data cube of 134x244x326; steps of 0.3arcsec
along X and X, of 1.96pm along Z in range
396.332-396.969nm)
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See also:
J/A+A/508/1403 : Oxygen lines in solar granulation. II. (Pereira+, 2009)
J/A+A/423/1109 : Center-to-limb variation of quiet Sun (Allende+, 2004)
Acknowledgements:
Christian Beck, cbeck(at)iac.es
(End) Patricia Vannier [CDS] 07-Jun-2011