Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...379l..79c&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 379, Oct. 1, 1991, p. L79-L82. Research supported by NSF.
Astronomy and Astrophysics
Astrophysics
46
Emission Spectra, Infrared Spectra, Line Shape, Metallicity, Solar Atmosphere, Solar Magnetic Field, Electric Field Strength, Line Spectra, Local Thermodynamic Equilibrium, Magnesium, Solar Spectra
Scientific paper
A non-LTE radiative transfer investigation of the emission lines is conducted at 7 and 12 microns using a realistic atomic model for neutral magnesium. An average quiet sun atmospheric model is used to calculate emission-line profiles that resemble the observed ones, i.e., broad absorption troughs with narrow central emission, and significant limb brightening. The charge exchange rates are found to be significant, but the effects of high-n coupling between Mg and Mg(+) together with radiative low-n transitions are of greater importance. It is confirmed that the emission cores are formed no higher than the temperature minimum region, and that the emission is caused by non-LTE effects rather than by the chromospheric temperature rise. It is inferred from the model calculations that the line core is sensitive to magnetic fields located almost 400 km above those measured in ordinary magnetograms; the gas pressure decreases 20-fold between these two heights.
Avrett Eugene H.
Chang Emily S.
Loeser Rudolf
Mauas Pablo J.
Noyes Robert W.
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