Abstract
view Abstract Citations (42) References (15) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Observations of the 12 Micron MG i Lines in Various Solar Features Zirin, Harold ; Popp, Bruce Abstract 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. Publication: The Astrophysical Journal Pub Date: May 1989 DOI: 10.1086/167418 Bibcode: 1989ApJ...340..571Z Keywords: Infrared Spectra; Metallicity; Solar Magnetic Field; Solar Spectra; Field Strength; Line Spectra; Magnesium; Stellar Activity; Solar Physics; INFRARED: SPECTRA; SUN: TRANSITION REGION; SUN: MAGNETIC FIELDS full text sources ADS |
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