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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
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:

       FileName      Lrecl  Records   Explanations

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)


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