Wallace L, Bernath P, Livingston W, Hinkle K, Busler J, Guo B, Zhang K
Kitt Peak National Observatory, National Optical Astronomy Observatories, Tucson, AZ 85726, USA.
Science. 1995 May 26;268(5214):1155-8. doi: 10.1126/science.7761830.
High-resolution infrared spectra of sunspot umbrae have been recorded with the 1-meter Fourier transform spectrometer on Kitt Peak. The spectra contain a very large number of water absorption features originating on the sun. These lines have been assigned to the pure rotation and the vibration-rotation transitions of hot water by comparison with high-temperature laboratory emission spectra.
