Quiet Sun observations of the Al i autoionization lines λ1932 and λ1936
Abstract
We present quiet Sun observations obtained during a rocket flight of the Al I autoionization lines λ1932 and λ1936 at solar pointings ranging from μ = 0.73 out to the visible limb. Absolute intensities are estimated to be accurate to approximately ±20%. These lines progressively weaken with decreasing μ but never go into emission before finally disappearing with the continuum just beyond the visible solar limb. The observations are compared with LTE line profiles computed through the quiet Sun atmosphere of Vernazza et al. (1976). We discuss several areas of disagreement between the synthetic and observed profiles.
- Publication:
-
Solar Physics
- Pub Date:
- February 1982
- DOI:
- 10.1007/BF00214132
- Bibcode:
- 1982SoPh...76..109C
- Keywords:
-
- Aluminum;
- Autoionization;
- Solar Atmosphere;
- Solar Spectra;
- Spectral Line Width;
- Thermodynamic Equilibrium;
- Calcium;
- Magnesium;
- Metal Ions;
- Solar Limb;
- Ultraviolet Astronomy;
- Solar Physics;
- Atmosphere;
- Line Profile;
- Absolute Intensity;
- Solar Limb;
- Rocket Flight