NSO/Kitt Peak Fourier Transform Spectrometer

 

https://noirlab.edu/public/images/noao-sun/

The Fourier Transform Spectrometer  (FTS) was operating at NSO's McMath-Pierce Solar Telescope from early 1970 (1971-1976) till 2001. In 2012, it was relocated to Old Dominion University in Norfolk, VA. The FTS data were used for solar and atmospheric physics research, and to develop several high-spectral resolution atlases of solar spectra: Flux from 296 to 1300 nm; Photosphere from 357 to 740.5 nm; Photosphere from 735 to 1123 nm; Infrared from 1100 to 5400 nm; Sunspot from 8100 to 21,000 nm plus photosphere from 16,000 to 22,000 nm; Sunspot umbra from 664.2 to 1123 nm; Sunspot umbra from 1160 to 5100 nm.

Recently, Mr. John Williams developed an interface for displaying solar spectra and extracting data from different FTS atlases. The interface can be accessed via fts.terrazoom.com.