Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...259l..53c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 259, no. 2, p. L53-L56.
Astronomy and Astrophysics
Astrophysics
12
Hydrogen, Infrared Spectra, Line Shape, Rydberg Series, Solar Atmosphere, Solar Spectra, Chromosphere, Infrared Stars, Stark Effect
Scientific paper
We study recently observed H I lines in the infrared solar spectrum, employing detailed NLTE modeling to explain their formation and to evaluate their diagnostic merits. The solar infrared H I lines vary much in character, depending on opacity and wavelength; our computations reproduce the observations closely. The line wings are primarily set by Stark broadening due to metal ions and protons; the line cores are sensitive to NLTE population departure divergence which is driven by Balmer-continuum photoionization. The formation heights of the H I lines range from the deep photosphere for near-infrared line wings to the chromosphere for line cores with wavelengths greater than 10 microns; these features provide valuable diagnostics of the thermal structure of the solar atmosphere.
Carlsson Marcus
Rutten Robert J.
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