Overlapping emission peaks in the solar C I multiplet at lambda 1560 and lambda 1657.
Abstract
Observations of the C I multiplets at 1560 and 1657 A made with the University of Colorado spectrometer on the OSO 8 satellite are presented and compared with computed profiles for the Vernazza-Avrett-Loeser solar atmosphere. These are optically thick emission lines formed in the solar chromosphere that show the central reversals typical of such lines. In each multiplet there is an interesting case of overlapping emission peaks which shows that such peaks do not constructively combine but instead weaken. This behavior is easily understood and reproduced with an optically thick, non-LTE mode of formation for these lines and is not consistent with an optically thin mechanism. We also find that the shapes of these blends are very sensitive to the magnitude of the nonthermal microvelocities.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- August 1978
- DOI:
- 10.1086/156372
- Bibcode:
- 1978ApJ...224..247S
- Keywords:
-
- Chromosphere;
- Line Shape;
- Satellite Observation;
- Solar Atmosphere;
- Solar Spectra;
- Ultraviolet Spectra;
- Atomic Spectra;
- Emission Spectra;
- Fine Structure;
- High Resolution;
- Optical Thickness;
- Oso-8;
- Spectral Resolution;
- Thermodynamic Equilibrium;
- Solar Physics;
- Line Profiles:Solar Chromosphere;
- Solar Spectrum:UV