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Title:
MG I absorption features in the solar spectrum near 9 and 12 microns
Authors:
Glenar, David A.; Reuter, Dennis C.; Deming, Drake; Chang, Edward S.
Affiliation:
AA(NASA, Goddard Space Flight Center, Greenbelt, MD), AB(NASA, Goddard Space Flight Center, Greenbelt, MD), AC(NASA, Goddard Space Flight Center, Greenbelt, MD), AD(Massachusetts, University, Amherst)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 335, Dec. 1, 1988, p. L35-L38. (ApJL Homepage)
Publication Date:
12/1988
Category:
Solar Physics
Origin:
STI
NASA/STI Keywords:
Absorption Spectra, Infrared Spectra, Magnesium, Solar Spectra, Atmospheric Correction, Emission Spectra, Line Spectra, Photosphere, Sunspots, Zeeman Effect
DOI:
10.1086/185334
Bibliographic Code:
1988ApJ...335L..35G

Abstract

High-resolution FTS observations from the Kitt Peak National Solar Observatory and the Spacelab 3 ATMOS experiment have revealed additional infrared transitions due to Mg I in the spectra of both quiet sun and sunspot penumbra. In contrast to previous observations, these transitions are seen in absorption, not emission. Absorption intensities range from 1 to 7 percent of the continuum in the quiet sun. In the penumbra, the same features appear to show Zeeman splitting. Modeling of the line profiles in the photospheric spectrum shows evidence for a factor of three overabundance in the n = 5 or more levels of Mg I in the upper photosphere, but with no deviations from a Planck source function. It is concluded that whatever the process that produces the emission (including the Lemke and Holweger mechanism), it must occur well above the tau(5000) = 0.01 level.

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