We review the formation of infrared solar spectral lines from highly excited levels in neutral atoms. The lines of Mg I and H I are the most interesting ones. We explain the NLTE processes by which they are affected and we study the sensitivity of the Mg I 12 μm lines to granulation and to flux tubes.
CITATION STYLE
Rutten, R. J., & Carlsson, M. (1994). The Formation of Infrared Rydberg Lines. Symposium - International Astronomical Union, 154, 309–322. https://doi.org/10.1017/s007418090012457x
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