Other
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009ycat..35070417p&link_type=abstract
VizieR On-line Data Catalog: J/A+A/507/417. Originally published in: 2009A&A...507..417P
Other
Sun, Spectroscopy
Scientific paper
We obtained solar observations of several lines at several positions of the solar disk. Data were obtained in May 2007 with the TRIPPEL spectrograph at the Swedish 1-m Solar Telescope (SST). The spectra were obtained for three distinct wavelength windows at approx 615, 630 and 777nm. Each window covers ~1nm. The spectra are spatially-resolved in the solar surface, hence are given as 2D spectrograms. One axis covers the wavelength and the other spatial position.
The observations are given for five positions in the solar disk, ordered by mu, the cosine of the heliocentric angle. The objective was to study the centre-to-limb variation of the lines. Active sun regions were avoided. In total 150 spectrograms are given for each wavelength window: 50 for the solar disk-centre (mu=1) and 25 for the other four positions (mu=0.8, 0.6, 0.4, 0.2). The images were selected by continuum contrast, hence their observed times are not the same for the three windows.
The spectrograms are given as FITS files. Each file has two Header/Data Units (HDU). The first HDU contains the reduced spectrogram, a 2D array. The first dimension of the array contains (FITS NAXIS1) corresponds to wavelength, and the second (FITS NAXIS2) to spatial coordinate. The second HDU contains the continuum levels obtained for each spatial point (1D array, length equal to the number of spatial points in the spectrogram). To obtain the normalized reduced spectrogram one has to divide each spectrum in the spectrogram by the corresponding continuum level. The spectrograms have been corrected for stray light and to minimize noise a Fourier filter has been applied (details in the paper).
Important note: the wavelength scales have NOT been corrected for solar rotation or gravitational redshift.
(3 data files).
Asplund Martin
Kiselman Dan
Pereira Tiago M. D.
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