Observations of the 12 micron MG I lines in various solar features

Details Observations of the 12 micron MG I lines in various solar features Observations of the 12 micron MG I lines in various solar features

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...340..571z&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 340, May 1, 1989, p. 571-578.

Astronomy and Astrophysics

Astrophysics

33

Infrared Spectra, Metallicity, Solar Magnetic Field, Solar Spectra, Field Strength, Line Spectra, Magnesium, Stellar Activity

Scientific paper

Measurements of the solar Mg I line at 812/cm are presented, confirming the ubiquitous narrow emission from the quiet sun with secant limb brightening observed by Brault and Noyes (1983). It is found that the central intensity of 12-micron emission lines is greater in plages than in the quiet sun, with an equivalent width up to 3 times greater than for the quiet sun. The magnetic fields measured in plages range from 300 to 800 Gauss. The secant-like limb brightening, and line ratios suggest that the lines are optically thin and are formed in collisional equilibrium with Mg II in a thin layer just above the temperature minimum.

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