*****  File ATLSINFO.TXT                                                      
                                                                              
     This information file is located in the SOL_ATLS subdirectory of the     
\DOCUMENT\APPENDIX directory.                                                 
                                                                              
     Two high resolution integrated disk solar spectra compiled from a variety
of sources are presented in this directory.  One was contributed by M. A'Hearn
and the other by R. Kurucz.  The A'Hearn solar spectrum found in one file,    
SOLATLS1.FIT, is given in vacuum wavelengths (Angstrom units), calibrated in  
flux units (erg/cm**2/s/A) covering the wavelength range 2245 A to 7000 A  in 
steps of 0.005 A.  The Kurucz solar spectrum can be found in two files,       
SOLATLS2.FIT AND SOLATLS3.FIT, in air wavelengths (Angstrom units), calibrated
in flux units (erg/cm**2/s/A).  SOLATLS2.FIT covers a wavelength range 2960 A 
to 8000 A in steps of 0.005 A. SOLATLS3.FIT covers the wavelength range 8000 A
to 13,000 A in steps of 0.01 A.  We note a wavelength shift between the two   
solar spectra presented in this archive of approximately 0.03 A in the sense  
A'Hearn minus Kurucz.  We therfore caution users of these files requiring     
wavelength accuracies better than this difference to first assess and correct 
the wavelengths of the solar spectra to a rest frame.  [NOTE:  This paragraph 
was extacted from the Spectroscopy and Spectrophotometry Discipline Appendix.]
                                                                              
     Unlike most files within the set of IHW CD-ROMs these files do not have  
separate header and data files; rather there is only one combined file, a true
FITS file.  The data are one dimensional spectra.  The table below summarizes 
the FITS header information:                                                  
                                                                              
                                                                              
File      Wavelength     Angstroms                     Source                 
             range       per pixel                                            
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SOLATLS1 2245 -  7000   0.005 (vac)  "A high Resolution Solar Atlas for       
                                      Fluorescence Calculations", 1983,       
                                      U of Maryland TR AP83-044, A'Hearn, M., 
                                      Ohlmacher, J., and Schleicher, D.       
                                                                              
SOLATLS2 2960 -  8000   0.005 (air)  "Solar Flux Atlas fro 296 to 1300 nm.",  
                                      1984, National Solar Observatory Atlas  
                                      No. 1,                                  
                                                                              
SOLATLS3 8000 - 13000   0.01  (air)  "Solar Flux Atlas fro 296 to 1300 nm.",  
                                      1984, National Solar Observatory Atlas  
                                      No. 1,                                  
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