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Measurements of the limb darkening in the forbidden Mgi line at 4571.1 Å |
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| Authors: | O R White R C Altrock J W Brault C D Slaughter |
| Institution: | (1) High Altitude Observatory, National Center for Atmospheric Research, Boulder, Colo., U.S.A.;(2) Sacramento Peak Observatory, Air Force Cambridge Research Laboratories, Sunspot, New Mex., U.S.A.;(3) Kitt Peak National Observatory, Tucson, Arizona, U.S.A. |
| Abstract: | We report high resolution measurements of the center-to-limb variation of the Mgi line at 4571.1 Å. This forbidden line is of interest because it should be formed in LTE. Comparison of our measurements with the Harvard-Smithsonian Reference Atmosphere show that the line center radiation originates in the temperature minimum region from 330 to 550 km above the point where 
continuum = 1. Observations near the limb confirm that the temperature minimum is  4200K.The National Center for Atmospheric Research and Kitt Peak National Observatory are sponsored by the National Science Foundation. |
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