The National Solar Observatory (NSO) is part of the National Optical Astronomy Observatories (NOAO) which was formed in 1984. NSO operates two major observatory sites. On Sacramento Peak in southern New Mexico (picture shown above left), major telescopes include the Vacuum Tower Telescope, the John W. Evans Solar Facility, and the Hilltop Dome. Sacramento Peak has been a center of solar research since 1950; the observatory is a cooperative undertaking of NSO and the Air Force Phillips Laboratory. On Kitt Peak, outside of Tucson, Arizona, NSO operates the McMath-Pierce Solar Facility and the vacuum solar telescope.
http://argo.tuc.noao.edu/welcome.html
http://argo.tuc.noao.edu/welcome.html